Java Integer equals() Method

The equals() method is a method of Integer class under java.lang package. This method compares the value of the parameter to the value of the current Integer object. It returns Boolean (True or False) which corresponds to the equality of this Integer and method argument object. It also overrides the equals() method of Object class.

Syntax:

Following is the declaration of equals() method:

Parameter:

DataType	Parameter	Description	Required/Optional
Object	obj	It checks the equality with the specified Integer	Required

Returns:

The equals() method will return true if the argument is not null and if the integer objects are the same as method argument object, otherwise it will return false.

Exceptions:

InputMismatchException

Compatibility Version:

Java 1.2 and above

Example 1

public class IntegerEqualsExample1 {
	public static void main(String[] args) {		
	    Integer obj1 = new Integer(43);
	    Integer obj2 = new Integer(78);
	    System.out.print("obj1 and obj2 are equal. True or False? = ");
	    System.out.println(obj1.equals(obj2));   			    
	    obj1 = new Integer(55);
	    obj2 = new Integer(55);
	    System.out.print("obj1 and obj2 are equal. True or false? = ");
	    System.out.println(obj1.equals(obj2));	    	     
	}
}

Output:

obj1 and obj2 are equal. True or False? = false
obj1 and obj2 are equal. True or false? = true

Example 2

import java.util.Scanner;
public class IntegerEqualsExample2 {
	public static void main(String[] args) {		
		Scanner readInput = new Scanner(System.in);
		System.out.print("Input the first Integer Number to be Compare: ");
		Integer intComp1 = readInput.nextInt();
		System.out.print("Input the second Integer Number to be Compare: ");
		Integer intComp2 = readInput.nextInt();
		boolean Result = intComp1.equals(intComp2);
		if (Result){			 
            System.out.println("Both the Integer numbers are same...");
            }
		else {
			System.out.println("Both the Integer numbers are different...");
			}
		readInput.close();
	}
}

Output:

1.	Input the first Integer Number to be Compare: 34
Input the second Integer Number to be Compare: 34
Both the Integer numbers are same...

2.	Input the first Integer Number to be Compare: 45
Input the second Integer Number to be Compare: 87
Both the Integer numbers are different...

Example 3

public class IntegerEqualsExample3 {
	public static void main(String[] args) {	
	  Integer objA = 20;		 
        Integer objB = 20;
        Integer objC = 10;
        System.out.println("objA == objB? " + objA.equals(objB));
        System.out.println("objB == objC? " + objB.equals(objC));
        System.out.println("objA == objC? " + objA.equals(objC));
        System.out.println("objC == objA? " + objC.equals(objA));
        System.out.println("objB == objA? " + objB.equals(objA));      
      }
}

Output:

objA == objB? true
objB == objC? false
objA == objC? false
objC == objA? false
objB == objA? true

Example 4

public class IntegerEqualsExample4 {
	public static void main(String[] args) {	
	  Float ObjFloat = 55.55f;		 
        Double ObjDouble = 55.55d;
        System.out.println("ObjFloat == ObjDouble? " +ObjFloat.equals(ObjDouble));    
	}
}

Output: