Java List hashCode() Method

The hashCode() method of List interface returns the hash code value for this list.

Syntax

Parameters

Specified By

hashcode in interface Collection<E>

Overrides

This method overrides hashCode in class Object

Returns

The hashCode() method returns the hash code value for this list.

Example 1

import java.util.ArrayList;
import java.util.List;
public class JavaListHashCodeExample1 {
public static void main(String[] args) {
        List<Integer> list = new ArrayList<>();
list.add(5);
list.add(51);
list.add(52);
//returns the hash code value for this list
for (Integer i : list) {
int val = i.hashCode();
System.out.println("Hash Code for "+i+" : "+val);
        }
    }
}

Test it Now

Output:

Hash Code for 5 : 5
Hash Code for 51 : 51
Hash Code for 52 : 52

Example 2

import java.util.ArrayList;
import java.util.List;
public class JavaColHashCodeExample2 {
public static void main(String[] args) {
        List<String> list = new ArrayList<>();
list.add("Reema");
list.add("Rahul");
//returns the hash code for the string
int val=list.hashCode();
System.out.println("Hash Code : "+val);
    }
}

Test it Now

Output:

Hash Code : -1772261557

Example 3

import java.util.ArrayList;
import java.util.List;
public class JavaListHashCodeExample3 {
public static void main(String[] args) {
        List<String> list = new ArrayList<>();
list.add(null);
//returns NullPointerException for null elements.
for(String str:list) {
System.out.println("Hash Code : " + str.hashCode());
        }
    }
}

Test it Now

Output:

Exception in thread "main" java.lang.NullPointerException
	at com.javaTpoint.JavaListHashCodeExample3.main(JavaListHashCodeExample3.java:12)

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Java List hashCode() Method

Syntax

Parameters

Specified By

Overrides

Returns

Example 1

Example 2

Example 3