A Java program to compare strings using == operator. == operator ckecks weather both the strings referring to the same String Object. The code snippet is used at https://coderolls.com/comparing-strings-in-java

CompareUsingEqualsToOperator.java

/**
 * A Java program to compare strings using == operator.
 * 
 * == operator ckecks weather both the strings referring
 * to the same String Object.
 * 
 * @author Gaurav Kukade at coderolls.com
 */

public class CompareUsingEqualsToOperator {

  public static void main(String[] args) {
    
    String firstString = "coderolls";
    String secondString = "javablog";
    String thirdString = "coderolls";
    
    // creating new String object with the same value as firstString or thirdString
    String fourthString =  new String("coderolls");
    
    System.out.println("Comparing strings using == operator \n");
    
    System.out.print("firstString == secondString : ");
    System.out.println(firstString == secondString);
    
    /*
     * Here firstString and thirdString is referring to the same String object
     * hence it will print 'true'.
     */
    System.out.print("firstString == thirdString : ");
    System.out.println(firstString == thirdString);
    
    /*
     * Here firstString and fourthString have same value
     * but they are referring to the different String object.
     * 
     * hence it will print 'false'
     */
    System.out.print("firstString == fourthString : ");
    System.out.println(firstString == fourthString);
  }
  
}