Why we override equals() method in java?

Why we override equals() method in java?

The equals method is used to check whether two objects are same or not. It needs to be overridden if we want to check the objects based on property.
 
 For example: Employee is a class that has 3 data members: id, name and salary. But, we want to check the equality of employee object on the basis of salary. Then, we need to override the equals() method.
  

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