String methods replace, toLowerCase, toUpperCase, trim and toCharArray. - Java Language Basics

Java examples for Language Basics:String

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Description

String methods replace, toLowerCase, toUpperCase, trim and toCharArray.

Demo Code

public class Main 
{
   public static void main(String[] args)
   {/*  w  ww .  j  av a  2 s  .  c o  m*/
      String s1 = "hello";
      String s2 = "GOODBYE";
      String s3 = "   spaces   ";

      System.out.printf("s1 = %s\ns2 = %s\ns3 = %s\n\n", s1, s2, s3);

      // test method replace      
      System.out.printf(
         "Replace 'l' with 'L' in s1: %s\n\n", s1.replace('l', 'L'));

      // test toLowerCase and toUpperCase
      System.out.printf("s1.toUpperCase() = %s\n", s1.toUpperCase());
      System.out.printf("s2.toLowerCase() = %s\n\n", s2.toLowerCase());

      // test trim method
      System.out.printf("s3 after trim = \"%s\"\n\n", s3.trim());

      // test toCharArray method
      char[] charArray = s1.toCharArray();
      System.out.print("s1 as a character array = ");

      for (char character : charArray)
         System.out.print(character);

      System.out.println();
   } 
}

Result


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