Vector forEach(Consumer) in Java

forEach(Consumer): This method is available in java.util.Vector class of Java.

Syntax:

void java.util.Vector.forEach(Consumer<? super K> action)

This method takes one argument. This method performs the given action for each element of the Iterable until all elements have been processed or the action throws an exception.

Parameters: One parameter is required for this method.

action: The action to be performed for each element.

Returns: NA

Throws:

NullPointerException - if the specified action is null

Approach 1: When no exception

Java

import java.util.Vector;

public class VectorforEach {
    public static void main(String[] args) {

        Vector<String> vector = new Vector<>();

        vector.add("Hello");
        vector.add("Java");
        vector.add("C++");
        vector.add("Program");

        vector.forEach((n -> System.out.print(n + " ")));

    }
}

Output:

Hello Java C++ Program 

Approach 2: NullPointerException 

Java

import java.util.Vector;

public class VectorforEach {
    public static void main(String[] args) {

        Vector<String> vector = new Vector<>();

        vector.add("Hello");
        vector.add("Java");
        vector.add("C++");
        vector.add("Program");

        vector.forEach(null);

    }
}

Output:

Exception in thread "main" java.lang.NullPointerException
	at java.base/java.util.Objects.requireNonNull(Objects.java:208)
	at java.base/java.util.Vector.forEach(Vector.java:1354)