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Constructor hashCode() method in Java with Examples
  • Last Updated : 29 Oct, 2019

The hashCode() method of java.lang.reflect.Constructor class is used to return a hashcode for this Constructor object. The hashcode is always the same if the constructed object doesn’t change. Hashcode is a unique code generated by the JVM at the time of class object creation. We can use hashcode to perform some operation on hashing related algorithms like a hashtable, hashmap, etc. We can search for an object with that unique code.

Syntax:

public int hashCode()

Parameters: This method accepts nothing.

Return: This method returns a hash code integer value for this object.

Below programs illustrate hashCode() method:
Program 1:






// Java program to illustrate hashCode() 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();
  
        // get hash code of this constructor class
        int code = cons[0].hashCode();
  
        // print result
        System.out.println(
            "Hash Code count = " + code);
    }
}
Output:
Hash Code count = -1114099497

Program 2:




// Java program to illustrate hashCode() 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();
  
        // get hash code of this constructor class
        int code = cons[0].hashCode();
  
        // print result
        System.out.println(
            "Hash Code count for string class"
            + " constructor = " + code);
    }
}
Output:
Hash Code count for string class constructor = 1195259493

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

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