Java8的lamdba表达式怎么实现对抽象接口

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总结：lamdba表达式 精髓就是对抽象接口方法的一个实现

import org.junit.jupiter.api.Test;import java.util.Arrays;import java.util.Collections;import java.util.List;public class TestLambda {    List emps = Arrays.asList(new Employee(101, "张三", 18, 9999.99),            new Employee(102, "李四", 59, 6666.66),            new Employee(103, "王五", 28, 3333.33),            new Employee(104, "赵六", 8, 7777.77),            new Employee(105, "田七", 38, 5555.55)    );    @Test    public void test1(){        Collections.sort(emps, (x,y)->{if(x.getAge()==y.getAge()){return x.getName().compareTo(y.getName());            }else {//                return -Integer.compare(x.getAge(), y.getAge());                return x.getAge()-y.getAge();            }        });        for (Employee emp : emps) {            System.out.println(emp);        }    }@Test    public void test2(){        String str=strHandler("  哎，你是软硬都不吃  ",(x)->x.trim());        System.out.println(str);        String str1=strHandler("哎，你是软硬都不吃", (x)->x.substring(4, 6));        System.out.println(str1);    }// 用于处理字符串    public String strHandler(String str,MyFunction mf){return mf.getValue(str);    }@Test    public void test3(){        op(100L, 200L, (x,y)->x*y);    }// 用于处理两个long型数据处理    public void op(Long l1,Long l2,MyFunction2 my){        System.out.println(my.getValue(l1, l2));    }}

MyFunction2类：

public interface MyFunction2 {   public R getValue(T t1, T t2);   }

MyFunction 类：

@FunctionalInterfacepublic interface MyFunction {      public String getValue(String str);}

Employee 类：

public class Employee {   private int id;   private String name;   private int age;   private double salary;   public Employee() {   }   public Employee(String name) {      this.name = name;   }   public Employee(String name, int age) {      this.name = name;      this.age = age;   }   public Employee(int id, String name, int age, double salary) {      this.id = id;      this.name = name;      this.age = age;      this.salary = salary;   }   public int getId() {      return id;   }   public void setId(int 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 double getSalary() {      return salary;   }   public void setSalary(double salary) {      this.salary = salary;   }   public String show() {      return "测试方法引用！";   }   @Override   public int hashCode() {      final int prime = 31;      int result = 1;      result = prime * result + age;      result = prime * result + id;      result = prime * result + ((name == null) ? 0 : name.hashCode());      long temp;      temp = Double.doubleToLongBits(salary);      result = prime * result + (int) (temp ^ (temp >>> 32));      return result;   }   @Override   public boolean equals(Object obj) {      if (this == obj)         return true;      if (obj == null)         return false;      if (getClass() != obj.getClass())         return false;      Employee other = (Employee) obj;      if (age != other.age)         return false;      if (id != other.id)         return false;      if (name == null) {         if (other.name != null)return false;      } else if (!name.equals(other.name))         return false;      if (Double.doubleToLongBits(salary) != Double.doubleToLongBits(other.salary))         return false;      return true;   }   @Override   public String toString() {      return "Employee [id=" + id + ", name=" + name + ", age=" + age + ", salary=" + salary + "]";   }}

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