多线程（续）
1.静态代理模式
package com.tian.demo02;
import com.sun.org.apache.xpath.internal.functions.FuncSubstringAfter;
//静态代理模式总结：
//真实对象和代理对象都要实现同一个接口
//代理对象要代理真实角色
//好处：
//代理对象可以做很多真实对象做不了的事情
//真实对象专注做自己的事情
public class StacticProxy {
public static void main(String[] args) {
You you = new You();//你要结婚
//WeddingCompany weddingCompany = new WeddingCompany(new You());
//weddingCompany.HappyMarry();
new WeddingCompany(new You()).HappyMarry();//上面两行合在一起
new Thread(()-> System.out.println("我爱你")).start();
}
}
interface Marry{
//人间四大喜事
//久旱逢甘露
//他乡遇故知
//洞房花烛夜
//金榜题目时
void HappyMarry();
}
//真实角色，你去结婚
class You implements Marry{
@Override
public void HappyMarry() {
System.out.println("秦老师要结婚了，超开心");
}
}
//代理角色，帮助你结婚
class WeddingCompany implements Marry{
//代理谁-->真实目标角色
private Marry target;
public WeddingCompany(Marry target) {
this.target = target;
}
@Override
public void HappyMarry() {
before();
this.target.HappyMarry();//这就是真实对象
after();
}
private void after() {
System.out.println("结婚之后，收尾款");
}
private void before() {
System.out.println("结婚之前，布置现场");
}
}
2.lambda表达式
2.1逐步简化到lambda表达式
package com.tian.lambda;
/*
推导lambda表达式
*/
public class TestLambda1 {
//3.静态内部类
static class Like2 implements ILike {
@Override
public void lambda() {
System.out.println("i like lambda2");
}
public static void main(String[] args) {
ILike like = new Like();
like.lambda();
like = new Like2();
like.lambda();
//4.局部内部类
class Like3 implements ILike {
@Override
public void lambda() {
System.out.println("i like lambda3");
}
}
like = new Like3();
like.lambda();
//5.匿名内部类,没有类的名称，必须借助接口或者父类
like =new ILike() {
@Override
public void lambda() {
System.out.println("i like lambda4");
}
};
like.lambda();
//6.用lambda简化
like = ()->{
System.out.println("i like lambda5");
};
like.lambda();
}
}
}
//1.定义一个函数式接口
interface ILike {
void lambda();
}
//2.实现类
class Like implements ILike {
@Override
public void lambda() {
System.out.println("i like lambda");
}
}
2.2lambda表达式再简化
package com.tian.lambda;
public class TestLambda2 {
public static void main(String[] args) {
//lambda表达式简化
ILove love = (int a)->{
System.out.println("i love you1-->"+a);
};
//简化1：参数类型
love = (a)->{
System.out.println("i love you1-->"+a);
};
//简化2.简化括号
love = a->{
System.out.println("i love you1-->"+a);
};
//简化3.去掉花括号
love = a -> System.out.println("i love you-->"+a);
//总结：
//lambda表达式只能有一行代码的情况下才能简化成为一行，如果有多行，那么就用代码块包裹。
//前提是接口为函数式接口
//多个参数也可以去掉参数类型，要去掉就都去掉，必须加()
love.love(520);
}
}
interface ILove{
void love(int a);
}
3.线程的停止
package com.tian.state;
//测试stop
//1.建议线程正常停止-->利用次数，不建议死循环
//2.建议使用标志位-->设置一个标志位
//3.不要使用stop或者destroy等过时或者JDK不建议使用的方法
public class TestStop implements Runnable{
//1.设置一个标志位
private boolean flag = true;
@Override
public void run() {
int i = 0;
while (flag){
System.out.println("run....Thread"+i++);
}
}
//2.设置一个公开的方法停止线程，转换标志位
public void stop(){
this.flag = false;
}
public static void main(String[] args) {
TestStop testStop = new TestStop();
new Thread(testStop).start();
for (int i = 0; i < 1000; i++) {
System.out.println("main"+i);
if(i==900){
//调用stop方法切换标志位，让线程停止
testStop.stop();
System.out.println("线程停止了");
}
}
}
}
4.线程休眠
4.1模拟延时
package com.tian.state;
import com.tian.demo01.TestThread4;
//模拟网络延时:放大问题的发生性
public class TestSleep implements Runnable{
//票数
private int ticketNums = 10;
@Override
public void run() {
while (true){
if (ticketNums <= 0 ){
break;
}
//模拟延时
try{
Thread.sleep(100);
}catch (InterruptedException e){
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+"-->拿到了第"+ticketNums--+"票");
}
}
public static void main(String[] args) {
TestSleep ticket = new TestSleep();
new Thread(ticket,"小明").start();
new Thread(ticket,"老师").start();
new Thread(ticket,"黄牛").start();
}
}
4.2模拟倒计时
package com.tian.state;
//模拟倒计时
public class TestSleep2 {
public static void main(String[] args) {
try {
tenDown();
}catch (InterruptedException e){
e.printStackTrace();
}
}
//模拟倒计时
public static void tenDown() throws InterruptedException{
int num = 10;
while (true){
Thread.sleep(1000);
System.out.println(num--);
if(num <=0) {
break;
}
}
}
}
4.3打印当前时间
package com.tian.state;
import java.text.SimpleDateFormat;
import java.util.Date;
//模拟倒计时
public class TestSleep2 {
public static void main(String[] args) {
//打印当前时间
Date startTime = new Date(System.currentTimeMillis());//获取系统当前时间
while (true){
try {
Thread.sleep(1000);
System.out.println(new SimpleDateFormat("HH:mm:ss").format(startTime));
startTime = new Date(System.currentTimeMillis());//更新系统当前时间
}catch (InterruptedException e){
e.printStackTrace();
}
}
}
//模拟倒计时
public static void tenDown() throws InterruptedException{
int num = 10;
while (true){
Thread.sleep(1000);
System.out.println(num--);
if(num <=0) {
break;
}
}
}
}
5.线程礼让
package com.tian.state;
//测试礼让线程
//礼让不一定成功，看CPU心情
public class TestYield {
public static void main(String[] args) {
MyYield myYield = new MyYield();
new Thread(myYield,"a").start();
new Thread(myYield,"b").start();
}
}
class MyYield implements Runnable{
@Override
public void run() {
System.out.println(Thread.currentThread().getName()+"线程开始执行");
Thread.yield();
System.out.println(Thread.currentThread().getName()+"线程停止执行");
}
}
6.插队
package com.tian.state;
//测试join方法 想象成插队
public class TestJoin implements Runnable{
@Override
public void run() {
for (int i = 0; i < 1000; i++) {
System.out.println("线程VIP来了"+i);
}
}
public static void main(String[] args) throws InterruptedException{
//启动我们的线程
TestJoin testJoin = new TestJoin();
Thread thread = new Thread(testJoin);
thread.start();
//主线程
for (int i = 0; i < 500; i++) {
if (i==200){
thread.join();//插队
}
System.out.println("main"+i);
}
}
}
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