Join all the characters and print them in a single line in java For example, "Hello, how are you?" split by spaces and joined with hyphens becomes: "Hello,-how-are-you?". Let’s discuss how to use newline characters. Method 1: Using BufferedReader Class and then splitting How do you concatenate characters in java? Concatenating strings would only require a + between the strings, but concatenating chars using + will change the value of the char into ascii and hence giving a numerical output. Java String join () methods are static. Using str. Methods to Concatenate Multiple Strings StringBuilder This article explores the concept of single-line if statements in Java, their syntax, when to use them, and best practices for implementing them. Aug 11, 2017 · how to print one character at a time on one line using a METHOD Asked 7 years, 11 months ago Modified 7 years, 11 months ago Viewed 2k times Aug 29, 2018 · In Java, we can use String. Dec 4, 2012 · StringUtils. has a length of , and has a length of ; the sum of their lengths is . Using split () and join () split () function divides the string into a list of words and join Jul 31, 2019 · I am new to java and I wrote a Basic Input/Output program and in this program I want the user to provide 3 different inputs and be saved in 3 different variables, they are two int and one char. join() method is as follows: Jan 17, 2023 · The joining () method of Collectors Class, in Java, is used to join various elements of a character or string array into a single string object. 1 More printing You can put as many statements as you want in main; for example, to print more than one line: Apr 1, 2011 · I'm reading numbers from a txt file using BufferedReader for analysis. com Oct 31, 2024 · In this article, we’re going to take a look at the Collectors. join(), which comes in two flavors. My code is as follows import java. As a Java developer with over 10 years of experience, printing messages and output to the terminal console is one of the first things you learn. Reading Write a Java program to print characters in a string with an example. Printing a string N times We can do this in various ways. The syntax for using the String. This method uses the stream to do so. The join () method is included in java string since JDK 1. This method takes in a delimiter and an array of strings, and returns a single string that has all the strings joined with the specified delimiter. Mar 29, 2013 · This snippet will show how to print out all the elements of a list separating them with a comma using straight up java. Can we declare multiple variables in a single line (Core Java Interview Question #147) For any doubts, live training updates and free Courses, please join our Telegram channel https://t. In this tutorial, we will see – How to Print a string N number of times in Java using various methods. It basically has the implementation of a character array. If i am printing 5 numbers, then it should print in the following fashion. Java provides three types of comments: Single Line, Multi-line, and Javadoc. However, we need to manage multiple-line user input in a different way. A fix would be: Jul 8, 2009 · Well your requirement said "read it line by line", which implies you don't need all the lines in memory at one time, so I would stick with the BufferedReader or Scanner approach, whichever you feel more comfortable with ( don't know which is more efficient). println(list) should print all the standard java object types (String, Long, Integer etc). • ch: Represents the vector of characters. print () it will print what you are passing it as parameter. readline, splitting this string into an array of strings using . Learn how to convert a formatted XML file into a one-line string in Java with step-by-step methods and code snippets. out. As an alternative to embedding \n characters within a single string, the program also demonstrates printing multiple lines by making successive calls to System. Then use it's method readLine: Reads a line of text. in); int abdou = 20; System. Mastering input handling is essential for Java developers, especially when dealing with user data or operational parameters in command-line Jul 23, 2025 · The string is a sequence of characters including spaces. Both methods offer flexible ways to handle stream processing and string concatenation in Java 8. Feb 21, 2011 · Trying to write a short method so that I can parse a string and extract the first word. 2 Question Given a string S of length N, that is indexed from 0 to N-1, print it's even indexed and odd indexed characters as 2 space separated strings on a single line. Assume input starts at index position 0 (which is considered even) Input The first line contains an integer, T (the number of test cases). Javadoc comments are written for Javadoc tool in order to generate html documentation pages. I would like to print it this way &quot;I am a boy&quot;. Both approaches are effective, with Collectors. Mar 24, 2010 · Is there an easy way to concatenate several lines of text into a string without constantly appending a newline? So I essentially need to do this: There is more involved, but that's the basic idea. Iterating Over String Arrays To iterate through a String array we can use a looping statement. Additionally, it allows customization with an optional prefix and suffix, making it ideal for structured text formatting. 1 String. spl Oct 9, 2023 · In Java, you can achieve this by adding newline characters to a string. Collectors class. println ()`, you can prevent the output from moving to the next line, allowing for inline display of results. Understanding Newline Characters A newline character, also known as the end-of-line (EOL) character, line break, or line separator, is a control character used to signify the end of a line and the start of a new one, effectively separating them. join () str. If the text content contains single or double quotes, there is no need to escape them. join () method concatenates the given elements with the delimiter and returns the concatenated string. *; public class You are given N characters in a line. Oct 29, 2011 · The '\b' character moves the printing cursor one character backwards, allowing you to overwrite the character that was printed there (it does not delete the entire line or even the character that was there unless you print new information on top). 8 release. stream. I would use a for loop right? A single statement can display multiple lines by using newline characters, which indicate to System. Jul 23, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. This is called concatenation: Apr 12, 2017 · AbDou CéTé Over a year ago i want if some one but number else 4 the code show false can you help me . Join all the characters and print them in a single line. 8. Mar 24, 2010 · Then I got tired of adding the newline character for every line. For this, we have taken three or more String values then we concatenate those String values by using different ways. Here is my code: String dataContainer; for (String temp 3. Jul 23, 2025 · In Java programming, there are a lot of ways to concatenate multiple strings. Character stream = a b c d e. Data from the additional arguments is formatted and written into placeholders in the formatted string, which are marked by a % symbol. Feb 10, 2015 · Suppose there are 2 int a & b, so when we take input from the scanner we need to first take one variables value then press enter then take another value from the user. The way in which arguments are formatted depends on the sequence of characters that follows the % symbol. I'm trying to print " _" multiple times. ). 1. A naive first approach is doing it I want to get all lines in a text into one line. Is there anything out there that might let me do something more along the lines of this though? Apr 8, 2025 · join () method is included in java string since JDK 1. Placeholders The placeholders have the form %[arg$][flags][width][. I want to read all these data in an Hi, is there a way i can print all the elements in a single line, instead of printing each in separate line? Thanks I need to take a String, and print each character of it on a seperate line. This is because the function print automatically does a break line. This is where a join method, to complement split, would come in handy, because then you could just join all the elements using a new line as the separator, and of course it doesn't append a new line to the end of the result; that's how I do it in various scripting languages (Javascript, PHP, etc. Note that if an element is null, then null is added. This method is most useful when you deal with text manipulation, parsing, or data extraction. println (), with each call printing a single line of text. In many cases, there is a need to add a new line to a string to format the output. , passed at the time of running the Java program. Sample Data For all our examples, let’s define sample data and parameters. Formatting output in Java to appear on a single line in the terminal can enhance readability and user experience. I'm wondering why Java still doesn't have a method to let you create a string by concatenating another string or character n times, since it's something I need a lot. Question 1 Concatenate characters You are given N characters in a line Join all the characters and print them in a single line Example Consider N-5. Output format Join all the characters and print them in a single line. Constraints 1≤ Oct 25, 2022 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. join(",", list) to join a List String with commas. Oct 3, 2013 · So I was just wondering if there was a way to print out multiple char variables in one line that does not add the Unicode together that a traditional print statement does. This conversion can be crucial for various reasons, such as preparing data for serialization, sending data over a network, or simply for better readability in certain contexts. Sample Input 0 hello java Sample Output 0 9 No Hello Java Explanation 0 String is "hello" and is "java". We read the input until we see the line break. join There are three lines of output: For the first line, sum the lengths of A and B. Input format The first line contains an integer N. Whether you're a beginner learning Java or an experienced developer looking to improve your coding practices, this article provides valuable insights into using single-line if statements effectively. println () in all the code because if you use System. Object ↳ java. Nov 25, 2024 · In this article, we explored different ways to read multiple integers from a single line in Java, including using the Scanner class with a loop and streams, and the BufferedReader for efficient input handling. 2. The String class in Java is used to create and implement string objects. These methods depend on the method requirement and desired output in coding. We've just been getting started, but my teacher wants us to do a bunch of research on our own and I can't figure out how to do the hom In Java, reading inputs efficiently is crucial for developing user-friendly applications. Apr 16, 2012 · System. This method returns a string array containing the required substring. In this blog post, we will explore the core concepts, typical usage scenarios, common Dec 31, 2018 · Just add a print of a new line after for loop calling primeNumbers The closing three double-quote characters can be in a separate line or added to the last appended line. May 31, 2025 · StringJoiner helps format sequences of characters by inserting a delimiter between elements. Jan 8, 2024 · When we write Java applications to accept users’ input, there could be two variants: single-line input and multiple-line input. There are three lines of output: For the first line, sum the lengths of A and B. Conclusion Converting a Stream<Character> to a String in Java 8 can be easily done using either Collectors. String Concatenation The + operator can be used between strings to combine them. May 11, 2024 · String formatting and generating text output often comes up during programming. For the third line, Capitalize the complete string A and B and print them on a single line, separated by a space. In this article, we have used two different ways, we will explain each method with one example for a better understanding of the concept. forEach Converting stream of lines to ArrayList Converting stream of lines to array Let's discuss them one by one: Example 1: forEach Print without ln would be the easiest way. Character stream abcde After concatening the stream - abode Function Description Complete the solve function provided in the editor. Command-line arguments passed from the console can be received by the Java program and used as input. public class SpecialChar { public static void main (String [] args) I have a set of Strings that I want to combine into one String with all sentences separated with a coma (&quot;,&quot;) like in a . Some of them are: Using for loop Taking input for N Using the Oct 16, 2025 · In Java programming, there are often situations where you have a multi - line string that you need to convert into a single line. I'm a beginner at coding trying to learn by doing. Any text between // and the end of the line is ignored by Java (will not be executed). println ()` method, you can insert newline characters (` `) between your desired outputs. Examples in the Material and Code Templates The examples in the material will not always show the template, but you can assume that your program file always needs one. A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a Jul 17, 2019 · The String join () method is used to join multiple strings, arrays, or Iterable elements to form a new string. Use forEach loop to iterate through elements of an Array and print each element in a new line. And if once you reach end of one string while if another string is still remaining then append the remaining of that string to final string Examples: Input : string 1 Sep 2, 2024 · Learn how Java's String. This function takes the following 2 parameters and returns the concatenated string: Nov 6, 2023 · Basic Usage of String. Feb 23, 2023 · Given 2 strings, merge them in an alternate way, i. print ()` instead of `System. Can anybody help me? Apr 8, 2025 · The java. Introduction In this article, we’ll explore how to read multiple integers from one line written in a file. So your method may be saving a few lines of code but at the cost of extra String manipulation. Therefore, to separate each character from the string, the individual characters Oct 11, 2021 · In order to read a file you need a BufferedReader: Reads text from a character-input stream, buffering characters so as to provide for the efficient reading of characters, arrays, and lines. On most machines this is represented by the special character \n. Returns a new String composed of copies of the CharSequence elements joined together with a copy of the specified delimiter. join(myList,",")) It will iterate through your array or list of strings and will join them, using the 2nd parameter as seperator. Constraints 1≤N≤10 This function takes the following 2 parameters and returns the concatenated string: • N: Represents the size of the array. Therefore, to separate each character from the string, the individual characters Jan 8, 2024 · Before we dive in, let’s revisit comments in Java. Remember that saving the 2 lines isn't really worth it when you're documenting your code properly. I am using BufferedReader class to read inputs in my Java program. join () method is the most efficient way to concatenate a list of strings in Python. Jun 15, 2010 · How can a char be entered in Java from keyboard? Sep 10, 2019 · Not a Java expert but have you tried System. . In case, if we are using custom object types, then we need to override toString() method of our custom object. Oct 2, 2025 · A String Array in Java is an array that stores string values. I tried this method but it's not working: System. Jul 23, 2025 · We are given a list of words and our task is to concatenate all the elements into a single string with spaces in between. Generally, by using `System. In the second line, the parentheses make sure x + y is calculated first (resulting in 11), so the output is "The sum is 11". Feb 3, 2022 · Here we will be discussing out three examples to get better understanding of working of String class lines () method with data structures. In this tutorial, we’ll address how to handle multiple-line user input in Java Variables Variables are containers for storing data values. There are two types of join () methods in java string. The join () method throws NullPointerException if the delimiter is null or the elements to join is null. This function takes the following 2 parameters and returns the concatenated string : N: Represents the size of the array . Then y is added to that string, so it becomes "The sum is 56". Input Format The first line contains an integer N. println'. Jul 23, 2025 · The String split () method in Java is used to split a string into an array of substrings based on matches of the given regular expression or specified delimiter. The javadoc will/should have more than 2 lines anyway. Aug 26, 2017 · 2 print the results of the 4 integers on separate lines by typing only once 'system. It combines Feb 1, 2023 · In Java, a character array is a data structure used to store a sequence of characters. Definition and Usage The printf() method outputs a formatted string. join () method simplifies string concatenation with delimiters. package javaapplication2; import java. Feb 2, 2024 · In this example, we first declare three variables: productName (a String), price (a double), and quantity (an integer), representing the name, price, and quantity of a product, respectively. Jan 31, 2017 · Java - Split and trim in one shot Asked 8 years, 9 months ago Modified 1 year, 11 months ago Viewed 135k times Jul 23, 2025 · There are 2 methods to take input from the user which are separated by space which are as follows: Using BufferedReader Class and then splitting and parsing each value Using nextInt ( ) method of Scanner class Let us discuss both the methods one by one in order to get a better understanding by implementing the same clean java programs. Example: Consider N = 5. I tried googling for this, didn't find appropriate answers. p Oct 17, 2024 · 1. How would you go about showing all the elements in an array list in one single line without having to show them on multiple lines. We can specify the delimiter string to be used when joining the elements. In Java, there are different types of variables, for example: String - stores text, such as "Hello". In the following example, we used for loop to iterate each and every character from start to end and print all the characters in the given string. join(separator, list) method; see Vitalii Federenko's answer. the final string's first character is the first character of the first string, the second character of the final string is the first character of the second string and so on. Output Format Join all the characters and print them in a single line. It concatenates all the characters in the vector and returns the concatenated string. There are various overloads of joining methods present in the Collector class. println (scanner. A string is a sequence of characters. Text to One Line Removes line breaks and converts multi-line text into a single line. Collectors. How do I match these for the same input text most effic Nov 4, 2025 · The task is to split a string into parts based on a delimiter and then join those parts with a different separator. csv file. joining() being more concise and StringBuilder being more efficient for large collections of characters. 99 char - stores single Note: Declaring many variables in one line is shorter, but writing one variable per line can sometimes make the code easier to read. Learn how to format XML output to ensure that each element appears on a single line. nextInt () + abdou); } } Depends on your coding style. Instead of using println(), which appends a newline character after printing, we use print() to keep the output on the same line. string. After concatenating the stream = abcde. println Use System. The Nov 25, 2024 · Three methods or functions are provided in the Java language to print the output. Example: Here, we will split a String having multiple delimiters or regex into an array of Strings. util. The way I'm going about this now is- reading a line using . For the third line, capitalize the first letter in both and and print them on a single line, separated by a space. Quite easy, you need to add a new-line character to the text you want to print. Alternatively, you could use a StringBuilder to build a single string containing all the strings that you want to include. print () at the place of System. In this particular problem statement, we are given to separate each individual characters from the string provided as the input. I want to read inputs from a user who can enter multiple integer data in single line with space. In this article, we will learn the concepts of String Arrays in Java including declaration, initialization, iteration, searching, sorting, and converting a String Array to a single string. I have a string like &quot;I am a boy&quot;. For example, given the list: li = ['hello', 'geek', 'have', 'a', 'geeky', 'day'] after concatenation, the result will be: "hello geek have a geeky day". I have tried the following. : Apr 28, 2025 · Methods for handling line breaks: The StringUtils class provides methods for handling line breaks in Strings, such as replaceEach () to replace multiple lines breaks with a single line break, and split () to split a String into an array of Strings based on line breaks. But the print methods in Java have more functionality than beginners realize. I am having trouble printing a string one character at a time in java. Java 8 1. They are part of the Java syntax and come in two basic formats: Single-line comments Multiline comments The text from the “//” characters to the end of the line represents a single-line comment: // This is a single-line comment. Additionally, a multiple-line comment (also known as a multiline comment) starts with the “/*” and ends Oct 9, 2016 · 0 You will need to concatenate them and then print the string result. String values are surrounded by double quotes int - stores integers (whole numbers), without decimals, such as 123 or -123 float - stores floating point numbers, with decimals, such as 19. The class hierarchy is as follows: java. Right now I have: Mar 1, 2009 · Java 8 introduces a String. You would use a for loop to show each elememnt on each line but that is not what i am after. While I could have easily created a small helper function to do it, I was hoping there might be something that already exists out there rather than having to expand my basic java library. Single-line Comments Single-line comments start with two forward slashes (//). joining Dec 9, 2023 · For the second line, write Yes if A is lexicographically greater than B otherwise print No instead. This example uses a single-line comment before a line of code: May 8, 2014 · Lets say I have multiple patterns P1, P2, P3,, and so on. It's probably acceptable to write it in one line, but I personally would write it like any other method (in 3 lines in this case) and IDE would format it that way (3 lines) usually. I have been looking for the best way to do this. join() method in Java is a simple and effective way to concatenate, or join, strings. Learn its use cases, limitations, and practical examples. lang. 4. These methods got added in String class in Java 1. Example Assumptions - $N=5$ - Character stream $=a b$ cde Approach After concatenating the stream, the stream becomes abcde. I assume I would use str. Let’s explore multiple methods to split and join a string in Python. In this tutorial, we’ll explore different ways to achieve this, such as using a space or a custom delimiter, or even regular expressions. I have to input a string and output it one letter per line. I am supposed to print multiple lines of output on command line, without using the newline (\n) character in java. Improve your XML handling in programming with our expert guide. print() statement. Mar 30, 2016 · I have been set a task to print out the 2nd, 3rd and 4th letter of a name within a String variable. Chapter 2 Variables and types 2. Single-line and multi-line comments are used for internal code documentation. So for example the name is John and I want to print out the letters 'o, h and n only' I was won How can I print a character multiple times in a single line? This means I cannot use a loop. Just remember - there is always a library for everything to make things easy. For example: char a =' In Java, if you want to print multiple lines using a single argument with the `System. This method is useful for concatenating the elements of a stream into In this code, the solve function takes an integer N representing the size of the array and a vector ch containing the characters. Mar 19, 2012 · 1 this is one of the interview question. Task Join all the characters and print them in a single line. Jun 1, 2016 · I'm looking for a clean and efficient method of declaring multiple variables of the same type and of the same value. This way your memory requirements are less. I have a few Set&lt;String&gt;s and want to transform each of these into a single String where each element of the original Set is separated by a whitespace " ". This method automatically appends a new line after each line of text, resulting in the same multi-line output. I know there's a simple solution to this prob Feb 7, 2009 · The AbstractCollection#toString () method simply iterates over all the elements and appends them to a StringBuilder. This technique allows you to format the output neatly and effectively while providing clear visibility to the user. out ’s print and println methods when to position the output cursor at the beginning of the next line in the command window. Nov 25, 2024 · Three methods or functions are provided in the Java language to print the output. I've spent four hours trying to solve this problem. Jan 10, 2025 · Learn about the Python join() function and its usage in string manipulation. The second line contains N characters. It can also be done using Java 8 static method String. I would prefer to follow the same rule for all operators if possible, and when you think of operators like +, - and so on, it is obviously more readable to break a line before them - just as if you were summing up values on a piece of paper. Oct 16, 2025 · In this blog post, we will explore different methods to achieve this conversion, understand the core concepts behind them, discuss typical usage scenarios, common pitfalls, and best practices. See full list on howtodoinjava. For the third line, capitalize the first letter in both A and B and print them on a single line, separated by a space. Returns : string joined with delimiter. join in Java The String. Objects of String are immutable in java, which means that once an object is created in a string, it's content cannot be changed. As such, the examples might be as short as a single line, such as the example below that illustrates the print command. The string Jul 23, 2025 · The string is a sequence of characters including spaces. For the second line, write Yes if A is lexicographically greater than B otherwise print No instead. In the single-line input case, it’s pretty straightforward to handle. The key part of the code is the System. Scanner; public class JavaApplication2 { public static void main (String args []) { Scanner scanner = new Scanner (System. We often use the next () or nextLine () methods to read each input on a separate line. Print Text You learned from the previous chapter that you can use the println() method to output values or print text in Java: Strings - Special Characters Because strings must be written within quotes, Java will misunderstand this string, and generate an error: Aug 10, 2025 · Java command-line argument is an argument, i. Function Description: Complete the solve function provided in the editor. precision Dec 14, 2023 · The Scanner class is a useful tool in Java for reading inputs from the console. The string May 7, 2025 · I'd like some help with a Java assignment, if it's no problem. This tutorial delves into techniques for reading multiple inputs from the same line, streamlining user interaction and enhancing the usability of your Java programs. The characters are stored in contiguous memory locations and can be accessed by their index, similar to an array of integers or any other data type. me Aug 26, 2017 · 2 print the results of the 4 integers on separate lines by typing only once 'system. The join method will accept a separator and vararg of strings to join together. split(","), however I would like t Jun 2, 2015 · I need to find all special characters and even the spaces in a sting and print it as a out put. Explanation: In the first line, Java combines "The sum is " with x, creating the string "The sum is 5". 99 or -19. Apr 11, 2025 · In Java, the substring () method of the String class returns a substring from the given string. Before Java 8, using a loop to iterate over the ArrayList was the only option: May 21, 2023 · Use Java Streams to map elements of an Array to String, join by any delimiter of your choice, and print in a single line. print()? You can print both in one line with this method but you'll need to call it twice for each variable. ch: Represents the vector of characters . We’ll explore the standard Java packages, specifically BufferedReader, and Scanner to achieve our desired result. These patterns are different Regex patterns to match different variations of DATE. e. Collectors joining () java. joining() or StringBuilder. joining() method from the java. However, sometimes we may want to read multiple inputs on the same line. println () a new line character is getting printed after our output on console each time it is called but if you use System. Join multiple strings efficiently.