Java String equals Example

String class equals method example

String class equals method example:- This method demonstrates the working of equals() method. it returns boolean values true and false after examining the two objects taken under checking process

Syntax:-equals(Object anObject)

Here is the code:-

/**
* @(#) EqualsString.java
* EqualsStringString class demonstrates the working of equals() method of String class of lang package
* @version 15-May-2008
* @author Rose India Team
*/




public class EqualsString {
public static void main(String args[]) {

  Integer in = new Integer(12234);
  String str = new String("12234");

  // since both objects posses same value but the type of value is
  // different. Here there are two types of objects compared one is
  // Integer type and the other one is String type so the method returns
  // false as values types didnot match

  System.out.println( "value types don't matches: " + in.equals(str));
         

  // method returns true if and only if none of the Strings compared
  // posses null value and also must that there value matches each other
  // in sequence, cases and all aspects of equality including value types
  String str1 = new String("  hare krishna hare rama! rama rama hare hare");
  String str2 = str1.substring(0);
  String str3 = " ", str4 = " ";
  String str5 = "heram", str6 = "Heram";
  //Method returns true here as both Strings str1 and str2 posses same values
  System.out.println(" 'true' is returned:  " + str1.equals(str2));
  //Both the String mentioned above don't have any value but still Strings are equal as both are null type objects compared"             
  System.out.println("Method returns true here:  " + str3.equals(str4));
  //Method here returns false because values of Strings did not match when their respective letters case are concerned        
  System.out.println(" 'false' is returned:  " + str5.equals(str6));
        
}
}

Output of the program:-

value types don't matches: false 'true' is returned: true Method returns true here: true 'false' is returned: false