Java List hashCode() Method with Examples

by Online Tutorials Library July 22, 2022

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);          }      }  }  

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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);      }  }  

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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());          }      }  }  

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Output:

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

Next TopicJava List

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Java List hashCode() Method with Examples

Java List hashCode() Method

Syntax

Parameters

Specified By

Overrides

Returns

Example 1

Example 2

Example 3

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