java是一门面向对象的语言；函数式编程；并行开发/基于事件的开发；
import java.util.Arrays; import java.util.Comparator; public class LambdaTest1 { class User{ public String name; public int score; public User(String name, int score) { super(); this.name = name; this.score = score; } @Override public String toString() { return "User [name=" + name + ", score=" + score + "]"; } } public void testOldUse(){ User[] us = new User[]{ new User("李白",90), new User("杜甫",86), new User("孟浩然",76) }; Arrays.sort(us,new Comparator<User>(){ @Override public int compare(User o1, User o2) { return Integer.compare(o1.score,o2.score); } }); System.out.println(Arrays.toString(us)); } public void testOldUser2(){ new Thread(new Runnable(){ @Override public void run() { System.out.println("hello lambda"); } }).start(); } public void testNewUse(){ User[] us = new User[]{ new User("李白",90), new User("杜甫",86), new User("孟浩然",76) }; Arrays.sort(us, (User o1, User o2) -> { return Integer.compare(o1.score,o2.score); } ); System.out.println(Arrays.toString(us)); } }
