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concat(), replace(), and trim() Strings in Java.
The concat() method of the String class appends one String to the end of another. The method returns a String with the value of the String passed into the method, appended to the end of the String, used to invoke this method.
Example
public class Test { public static void main(String args[]) { String s = "Strings are immutable"; s = s.concat(" all the time"); System.out.println(s); } }
Output
Strings are immutable all the time
This replace() method of the String class returns a new string resulting from replacing all occurrences of oldChar in this string with newChar.
Example
public class Test { public static void main(String args[]) { String Str = new String("Welcome to Tutorialspoint.com"); System.out.print("Return Value :" ); System.out.println(Str.replace('o', 'T')); System.out.print("Return Value :" ); System.out.println(Str.replace('l', 'D')); } }
Output
Return Value :WelcTme tT TutTrialspTint.cTm Return Value :WeDcome to TutoriaDspoint.com
This trim() method of the String class returns a copy of the string, with leading and trailing whitespace omitted.
Example
import java.io.*; public class Test { public static void main(String args[]) { String Str = new String(" Welcome to Tutorialspoint.com "); System.out.print("Return Value :" ); System.out.println(Str.trim() ); } }
Output
Return Value :Welcome to Tutorialspoint.com
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