Java 8 Optional ofNullable() Method Example

1. Overview

In this tutorial, We'll learn ofNullable() example on how to create new Java 8 Optional object for any value or null value. Optional is part of java.util package.

API Note: Returns an Optional describing the given value, if non-null, otherwise returns an empty Optional.

Java 8 Optional of() Method Example

1. Overview

In this tutorial, We'll learn how to create an Optional object for any value in Java 8. This is a very useful method to create an instance of Optional. Optional is a new class and introduced part of java.util package.

In last tutorial, We've discussed Optional.empty() method.

Let us take a look at Syntax, Example program on of() method.

API note: Returns an Optional describing the given non-null value. If null value, it throws NullPointerException.

Java 8 Optional empty() Method Examples

1. Overview

In this tutorial, We'll learn how to create an empty Optional instance using Java 8 empty() method. Let us take at the Java 8 Optional empty() example program.
Before that let us take a look at the syntax first and then next its usage.

empty() method is used to create an empty Optional object. That means no value is present for this Optional. Optional is a final class.

Java 8 IntStream empty() Method Example

1. Introduction

In this tutorial, We'll learn about Java 8 Instream API empty() method example programs.

empty() method is used to create a new empty Instream. The returned stream is a sequential stream. That means all the elements of Stream are processed one by one the order they appear in it.

Java 8 Stream allMatch() Method

Stream allMatch() Method 

In this tutorial, We will see the example program on Java 8 Stream allMatch() method. allMatch() method checks whether all elements of Stream is matched to the given predicate then it returns true. Otherwise returns false.


This is called Terminal Operation because this is executed at the end of the stream. That means Stream is closed after the execution of allMatch() method.