Reputation: 1779

How can I print a string adding newlines in Java?

I have a string like

"I am a boy".

I would like to print it this way

"I 
am 
a
boy".

Can anybody help me?

Upvotes: 161

Answers (17)

Stephan

Reputation: 4443

If you simply want to print a newline in the console you can use \n for newlines.

If you want to break text in Swing components you can use HTML and its <br>:

String str = "<html>first line<br>second line</html>";

Upvotes: 6

Surendar D

Reputation: 5644

\n is used for making separate line;

Example:

System.out.print("I" +'\n'+ "am" +'\n'+ "a" +'\n'+ "boy");

Result:

I
am
a
boy

Upvotes: 8

Vipin Pandey

Reputation: 907

Here I am using the split function. I braked String from spaces. then I used println function and printed the value.

    public class HelloWorld{

     public static void main(String []args){
              String input = "I am a boy";
              String[] opuput = input.split(" ");
          for (int i = 0; i < opuput.length; i++)
                System.out.println(opuput[i]);
         }        
}

Upvotes: -1

Bandham Manikanta

Reputation: 1985

Platform-Independent Line Breaks:

finalString = "physical" + System.lineSeparator() + "distancing";
System.out.println(finalString);

Output:

physical
distancing

Notes:

Java 6: System.getProperty("line.separator")
Java 7 & above: System.lineSeparator()

Upvotes: 7

Harisudha

Reputation: 587

Here it is!! NewLine is known as CRLF(Carriage Return and Line Feed).

For Linux and Mac, we can use "\n".
For Windows, we can use "\r\n".

Sample:

System.out.println("I\r\nam\r\na\r\nboy");

Result:

It worked for me.

Upvotes: 0

Tung Duong

Reputation: 1166

I use this code String result = args[0].replace("\\n", "\n");

public class HelloWorld {

    public static void main(String[] args) {
        String result = args[0].replace("\\n", "\n");
        System.out.println(result);
    }
}

with terminal I can use arg I\\nam\\na\\boy to make System.out.println print out

I
am
a
boy

Upvotes: 0

Ripon Al Wasim

Reputation: 37746

It can be done several ways. I am mentioning 2 simple ways.

Very simple way as below:
```
System.out.println("I\nam\na\nboy");
```

It can also be done with concatenation as below:

System.out.println("I" + '\n' + "am" + '\n' + "a" + '\n' + "boy");

Upvotes: 29

Levent Divilioglu

Reputation: 11602

Example

System.out.printf("I %n am %n a %n boy");

Output

I 
 am 
 a 
 boy

Explanation

It's better to use %n as an OS independent new-line character instead of \n and it's easier than using System.lineSeparator()

Why to use %n, because on each OS, new line refers to a different set of character(s);

Unix and modern Mac's   :   LF     (\n)
Windows                 :   CR LF  (\r\n)
Older Macintosh Systems :   CR     (\r)

LF is the acronym of Line Feed and CR is the acronym of Carriage Return. The escape characters are written inside the parenthesis. So on each OS, new line stands for something specific to the system. %n is OS agnostic, it is portable. It stands for \n on Unix systems or \r\n on Windows systems and so on. Thus, Do not use \n, instead use %n.

Upvotes: 63

Emalton

Reputation: 1529

You can also use System.lineSeparator():

String x = "Hello," + System.lineSeparator() + "there";

Upvotes: 152

mrVoid

Reputation: 995

Go for a split.

String string = "I am a boy";
for (String part : string.split(" ")) {
    System.out.println(part);
}

Upvotes: 1

Mehdi Roostaeian

Reputation: 521

you can use <br> tag in your string for show in html pages

Upvotes: -1

Alex S. Diaz

Reputation: 2667

What about %n using a formatter like String.format()?:

String s = String.format("I%nam%na%nboy");

As this answer says, its available from java 1.5 and is another way to System.getProperty("line.separator") or System.lineSeparator() and, like this two, is OS independent.

Upvotes: 6

Kippi

Reputation: 514

To make the code portable to any system, I would use:

public static String newline = System.getProperty("line.separator");

This is important because different OSs use different notations for newline: Windows uses "\r\n", Classic Mac uses "\r", and Mac and Linux both use "\n".

Commentors - please correct me if I'm wrong on this...

Upvotes: 13

Wolfpack'08

Reputation: 4128

Full program example, with a fun twist:

Open a new blank document and save it as %yourJavaDirectory%/iAmABoy/iAmABoy.java. "iAmABoy" is the class name.

Paste the following code in and read through it. Remember, I'm a beginner, so I appreciate all feedback!

//The class name should be the same as your Java-file and directory name.
class iAmABoy {

    //Create a variable number of String-type arguments, "strs"; this is a useful line of code worth memorizing.
    public static void nlSeparated(String... strs) {

        //Each argument is an str that is printed.
        for (String str : strs) {

            System.out.println(str);

        }

    }

    public static void main(String[] args) {

        //This loop uses 'args' .  'Args' can be accessed at runtime.  The method declaration (above) uses 'str', but the method instances (as seen below) can take variables of any name in the place of 'str'.
        for (String arg : args) {

            nlSeparated(arg);

        }

        //This is a signature.  ^^
        System.out.print("\nThanks, Wolfpack08!");
    } 

}

Now, in terminal/cmd, browse to %yourJavaDirectory%/iAmABoy and type:

javac iAmABoy.java
java iAmABoy I am a boy

You can replace the args I am a boy with anything!

Upvotes: 1

Andrea Girardi

Reputation: 4427

Try:

System.out.println("I\nam\na\nboy");

Upvotes: 16

Prince John Wesley

Reputation: 63688

System.out.println("I\nam\na\nboy");

System.out.println("I am a boy".replaceAll("\\s+","\n"));

System.out.println("I am a boy".replaceAll("\\s+",System.getProperty("line.separator"))); // portable way

Upvotes: 159

Hachi

Reputation: 3289

If you want to have your code os-unspecific you should use println for each word

System.out.println("I");
System.out.println("am");
System.out.println("a");
System.out.println("boy");

because Windows uses "\r\n" as newline and unixoid systems use just "\n"

println always uses the correct one

Upvotes: 5

How can I print a string adding newlines in Java?

Answers (17)

Example

Output

Explanation

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