String methods equals, equalsIgnoreCase, compareTo and regionMatches. - Java Language Basics

Java examples for Language Basics:String

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Description

String methods equals, equalsIgnoreCase, compareTo and regionMatches.

Demo Code

public class Main 
{
   public static void main(String[] args)
   {//from  ww w  .ja v a 2s.c  o m
      String s1 = new String("hello"); // s1 is a copy of "hello"
      String s2 = "this is a test";
      String s3 = "Happy Birthday";
      String s4 = "happy birthday";

      System.out.printf(
         "s1 = %s\ns2 = %s\ns3 = %s\ns4 = %s\n\n", s1, s2, s3, s4);

      // test for equality
      if (s1.equals("hello"))  // true
         System.out.println("s1 equals \"hello\"");
      else
         System.out.println("s1 does not equal \"hello\""); 

      // test for equality with ==
      if (s1 == "hello")  // false; they are not the same object
         System.out.println("s1 is the same object as \"hello\"");
      else
         System.out.println("s1 is not the same object as \"hello\"");

      // test for equality (ignore case)
      if (s3.equalsIgnoreCase(s4))  // true
         System.out.printf("%s equals %s with case ignored\n", s3, s4);
      else
         System.out.println("s3 does not equal s4");

      // test compareTo
      System.out.printf(
         "\ns1.compareTo(s2) is %d", s1.compareTo(s2));
      System.out.printf(
         "\ns2.compareTo(s1) is %d", s2.compareTo(s1));
      System.out.printf(
         "\ns1.compareTo(s1) is %d", s1.compareTo(s1));
      System.out.printf(
         "\ns3.compareTo(s4) is %d", s3.compareTo(s4));
      System.out.printf(
         "\ns4.compareTo(s3) is %d\n\n", s4.compareTo(s3));

      // test regionMatches (case sensitive)
      if (s3.regionMatches(0, s4, 0, 5))
         System.out.println("First 5 characters of s3 and s4 match");
      else
         System.out.println(
            "First 5 characters of s3 and s4 do not match");

      // test regionMatches (ignore case)
      if (s3.regionMatches(true, 0, s4, 0, 5))
         System.out.println(
            "First 5 characters of s3 and s4 match with case ignored");
      else
         System.out.println(
            "First 5 characters of s3 and s4 do not match");
   } 
}

Result


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