Sort with Object in Lambda Expressions in Java 8

Student Entity

package nilpointer.net;

public class Student {

	private String id;
	private String name;
	private int age;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public Student(String id, String name, int age) {
		this.id = id;
		this.name = name;
		this.age = age;
	}

	public Student() {
	}

	@Override
	public String toString() {
		return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
	}

}

Run Application

package nilpointer.net;

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

public class Demo {

	public static void main(String[] args) {

		List<Student> students = new ArrayList<Student>();
		students.add(new Student("st01", "Name 1", 23));
		students.add(new Student("st02", "Name 2", 21));
		students.add(new Student("st03", "Name 3", 24));

		System.out.println("Ascending Order");
		students.stream().sorted((student1, student2) -> student1.getAge() - student2.getAge()).forEach(student -> {
			System.out.println(student.toString());
			System.out.println("--------------------------------------");
		});

		System.out.println("\nDescending  Order");
		students.stream().sorted((student1, student2) -> student2.getAge() - student1.getAge()).forEach(student -> {
			System.out.println(student.toString());
			System.out.println("--------------------------------------");
		});

		System.out.println("\nSort with Condition");
		students.stream().filter(student -> student.getAge() > 21)
				.sorted((student1, student2) -> student1.getAge() - student2.getAge()).forEach(student -> {
					System.out.println(student.toString());
					System.out.println("--------------------------------------");
				});

	}

}

Output

Ascending Order
Student [id=st02, name=Name 2, age=21]
--------------------------------------
Student [id=st01, name=Name 1, age=23]
--------------------------------------
Student [id=st03, name=Name 3, age=24]
--------------------------------------

Descending  Order
Student [id=st03, name=Name 3, age=24]
--------------------------------------
Student [id=st01, name=Name 1, age=23]
--------------------------------------
Student [id=st02, name=Name 2, age=21]
--------------------------------------

Sort with Condition
Student [id=st01, name=Name 1, age=23]
--------------------------------------
Student [id=st03, name=Name 3, age=24]
--------------------------------------