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Java String new line

Posted by: admin November 29, 2017 Leave a comment

Questions:

I have string like ” I am a boy”. I want to print like this way
” I (\n new line) am (\n new line) a (\n new line) boy”.

Can anybody help me?

Answers:
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

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You can also use System.lineSeparator():

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

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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.

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

  1. Very simple way as below:

    System.out.println("I\nam\na\nboy");
    
  2. It can also be done with concatenation as below:

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

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

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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…

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\n is used for making separate line;

Example:

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

Result:

I
am
boy

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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:

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

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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

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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.

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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!

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

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System.out.println(“I\nam\na\nboy”);

This works
It will give one space character also along before enter character

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Go for a split.

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