What is Objects.isNull in Java?

Overview

The method isNull is a static method of the Objects class in java that checks whether the input object reference supplied to it is null or not.

  • If the passed object is null, then the method returns true.
  • If the passed object is non-null, then the method returns false.

This method was introduced in Java 8. To use the nonNull method, import the following module:

java.util.Objects

Syntax

public static boolean isNull(Object obj)

Parameters:

This method takes one parameter, Object obj, an object reference to check against null.

Examples

In the code below, a non-null string object is passed to the isNull method, and returns false:

import java.util.Objects;
public class Main {
    public static void main(String[] args) {
        String s = "hello";
        System.out.println(Objects.isNull(s));
    }
}

In the code below, null is passed to the isNull method and returns true:

import java.util.Objects;
public class Main {
    public static void main(String[] args) {
        System.out.println(Objects.isNull(null));
    }
}

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