Difference between == and equals()

equals is used for non-primitives basically for Objects.

== is used for primitives.

So, you can use it

public static boolean checkStatus (int a) {
    if (a == 10)
        return true;
   return false;
}

Example 1: For object, if equals method are overridden, then "equals" method will return true.

public class Employee {
    int id;

    @Override
    public boolean equals(Object obj) {
        Employee e = (Employee) obj;
        return id == e.id;
    }

    Employee(int id) {
        this.id = id;
    }

    public static void main(String[] args) {
        Employee e1 = new Employee(5);
        Employee e2 = new Employee(5);
        System.out.println("e1.equals(e2) is: " + e1.equals(e2));
        System.out.println("(e1 == e2) is: " + (e1 == e2));
    }
}

Output:

e1.equals(e2) is: true

(e1 == e2) is: false

Example 2: For object, if equals method are not overridden, then "equals" method works as "=="

public class Employee {
    int id;

    Employee(int id) {
        this.id = id;
    }

    public static void main(String[] args) {
        Employee e1 = new Employee(5);
        Employee e2 = new Employee(5);
        System.out.println("e1.equals(e2) is: " + e1.equals(e2));
        System.out.println("(e1 == e2) is: " + (e1 == e2));
    }
}

Output:

e1.equals(e2) is: false

(e1 == e2) is: false

Here "equals" method works as "==". So, don't forget to override the equals method for object.

Original Link: Whats wrong with this boolean method?