Constructor hashCode() method in Java with Examples
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()
