Java – String compareTo() Method

Description:

There are two variant of this method. First method compares this String to another Object and second method compares two strings lexicographically.
Syntax:

Here is the syntax of this method:

int compareTo(Object o)

or

int compareTo(String anotherString)

Parameters:

Here is the detail of parameters:

  • o — the Object to be compared.
  • anotherString — the String to be compared.

Return Value :

The value 0 if the argument is a string lexicographically equal to this string; a value less than 0 if the argument is a string lexicographically greater than this string; and a value greater than 0 if the argument is a string lexicographically less than this string.

Example:

public class Test {

   public static void main(String args[]) {
      String str1 = "Strings are immutable";
   String str2 = "Strings are immutable";
      String str3 = "Integers are not immutable";

      int result = str1.compareTo( str2 );
      System.out.println(result);
   
      result = str2.compareTo( str3 );
      System.out.println(result);
  
      result = str3.compareTo( str1 );
      System.out.println(result);
   }
}


This produces following result:

output:
0
10
-10
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