Java Stream.of() Example
May 30, 2020
Stream.of method example. The Stream.of is used to create sequential streams for the given elements. We can pass a single element or multiple elements to Stream.of method.
Find the
Stream.of method declarations from Java doc.
1.
static <T> Stream<T> of(T t)
Returns: The method returns a stream with one element.
2.
static <T> Stream<T> of(T... values)
Returns: The method returns a stream containing the given elements.
The
Stream.of creates a stream of finite elements. To create a stream of infinite elements, we can use Stream.generate method.
Now find some examples of
Stream.of method.
Example-1
Let us create the stream of integers.
Stream<Integer> mystream = Stream.of(10, 12, 14, 16);
mystream.forEach(e -> System.out.println(e));
Example-2
Let us create stream of string.
Stream<String> mystream = Stream.of("AA", "BB", "CC", "DD");
mystream.forEach(e -> System.out.println(e));
Example-3
Find the example to create the stream of objects.
StreamOfObjDemo.java
package com.concretepage;
import java.util.stream.Stream;
public class StreamOfObjDemo {
public static void main(String[] args) {
Stream<User> userStream = Stream.of(
new User("Mahesh", 22),
new User("Krishn", 20),
new User("Suresh", 25)
);
userStream.forEach(u -> System.out.println(u.getUserName()));
}
}
class User {
private String userName;
private int age;
public User(String userName, int age) {
this.userName = userName;
this.age = age;
}
//Sets and Gets
}
Mahesh Krishn Suresh
Example-4
To create
IntStream, we use IntStream.of method.
To create
LongStream, we use LongStream.of method.
To create
DoubleStream, we use DoubleStream.of method.
Find the examples.
StreamOfDemo.java
package com.concretepage;
import java.util.stream.DoubleStream;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
public class StreamOfDemo {
public static void main(String[] args) {
System.out.println("--- IntStream ---");
IntStream intStream = IntStream.of(12, 14, 16);
intStream.forEach(e -> System.out.println(e));
System.out.println("--- LongStream ---");
LongStream longStream = LongStream.of(154L, 236L, 306L);
longStream.forEach(e -> System.out.println(e));
System.out.println("--- DoubleStream ---");
DoubleStream doubleStream = DoubleStream.of(123.56, 456.87, 784.65);
doubleStream.forEach(e -> System.out.println(e));
}
}
--- IntStream --- 12 14 16 --- LongStream --- 154 236 306 --- DoubleStream --- 123.56 456.87 784.65
