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Constructor equals() method in Java with Examples

  • Last Updated : 29 Oct, 2019

The constructor class provides information about a single constructor for a class and it also provides access to that constructor.
The equals() method of java.lang.reflect.Constructor is used to compare this Constructor against the passed object. If the objects are the same then the method returns true. In java Two Constructor objects are the same if and only if they were declared by the same class and have the same formal parameter types.

Syntax:

public boolean equals(Object obj)

Parameters: This method accepts obj which is the reference object with which to compare.

Return: This method returns true if this object is the same as the obj argument. Else it returns false.

Below programs illustrate equals() method:
Program 1:




// Java program to illustrate equals() method
  
import java.lang.reflect.Constructor;
  
public class GFG {
  
    public static void main(String[] args)
    {
        // create a class object
        Class classObj = String.class;
  
        // get Constructor object array from class object
        Constructor[] cons = classObj.getConstructors();
  
        // apply equals method
        System.out.println("Constructor 1: " + cons[0]);
        System.out.println("Constructor 2: " + cons[1]);
        boolean result = cons[0].equals(cons[1]);
  
        // print result
        System.out.println("Both constructor are equal: "
                           + result);
    }
}
Output:
Constructor 1: public java.lang.String(byte[], int, int)
Constructor 2: public java.lang.String(byte[], java.nio.charset.Charset)
Both constructor are equal: false

Program 2:




// Java program to illustrate equals() method
  
import java.lang.reflect.Constructor;
import java.util.ArrayList;
  
public class GFG {
  
    public static void main(String[] args)
    {
        // create a class object
        Class classObj = ArrayList.class;
  
        // get Constructor object array from class object
        Constructor[] cons = classObj.getConstructors();
  
        // apply equals method
        System.out.println("Constructor 1: " + cons[0]);
        Object obj = cons[0];
        System.out.println("Object: " + obj);
        boolean result = cons[0].equals(obj);
  
        // print result
        System.out.println("Both constructor are equal: "
                           + result);
    }
}
Output:
Constructor 1: public java.util.ArrayList(java.util.Collection)
Object: public java.util.ArrayList(java.util.Collection)
Both constructor are equal: true

References: https://docs.oracle.com/javase/10/docs/api/java/lang/reflect/Constructor.html#equals(java.lang.Object)


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