Method References via non static method - Java Lambda Stream

Java examples for Lambda Stream:Method Reference

  1. HOME
  2. Java
  3. Lambda Stream
  4. Method Reference

Description

Method References via non static method

Demo Code


import java.util.Arrays;

public class MethodReferencesMain1 {
  public static void main(String[] args) {
    Stu[] stusArr = new Stu[] { new Stu(10, "Vikram"), new Stu(30, "Rohit"), new Stu(40, "Seema"),
        new Stu(20, "Geetika") };
    for (Stu stu : stusArr) {
      System.out.println(stu);/*  w ww .  j  a v a2s  .c o m*/
    }

    System.out.println("##Sort By Age##");
    Arrays.sort(stusArr, (stu1, stu2) -> stu1.age - stu2.age);
    for (Stu stu : stusArr) {
      System.out.println(stu);
    }

    System.out.println("##Sort By Name##");
    Arrays.sort(stusArr, new SortStuByAge()::compareByName);
    for (Stu stu : stusArr) {
      System.out.println(stu);
    }
  }
}

class Stu {
  int age;
  String name;

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

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

class SortStuByAge {

  public int compareByAge(Stu o1, Stu o2) {
    return o1.age - o2.age;
  }

  public int compareByName(Stu o1, Stu o2) {
    return o1.name.compareTo(o2.name);
  }
}

Related Tutorials