[Java 8 Examples] How to remove all Null values from List using Java 8 Lamdas

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 Hi Guys,

Welcome to Java Inspires.

In this post, we will see how to remove all Null values from a Java List using Java 8 Lamdas.

package java8examples;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

/**
 * 
 * @author #JavaInspires
 *
 */
public class Java8Example {

	public static void main(String[] args) {
		// create a string list
		List<String> names = new ArrayList<String>();
		// add elements
		names.add(null);
		names.add("John");
		names.add(null);
		names.add("David");
		names.add(null);
		// print names list with null values
		System.out.println(names);

		// remove null values
		names.removeIf(Objects::isNull);

		System.out.println(names);
	}
}

Output

[null, John, null, David, null]
[John, David]

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About Objects class:

public final class Objects extends Object

This class consists of static utility methods for operating on objects. These utilities include null-safe or null-tolerant methods for computing the hash code of an object, returning a string for an object, and comparing two objects.

public static boolean isNull(Object obj)

Returns true if the provided reference is null otherwise returns false.

API Note:

This method exists to be used as a Predicate, filter(Objects::isNull)

Parameters:

obj - a reference to be checked against null

Returns:

true if the provided reference is null otherwise false

Since:

1.8

Ref: https://docs.oracle.com/javase/8/docs/api/java/util/Objects.html

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