java 多线程 交替_java 多线程–线程交替
要求:
借助同步機制,sleep()方法,join()方法,實現動畫顯示;
甲線程:1、3、5、7、9
乙線程:2、4、6、8、10
丙線程:a、b、c、d、e
main()線程輸出:線程開始,線程結束
輸出結果:線程開始,1-a-2## 3-b-4## 5-c-6## …
思考:
使用多個判斷標記,模擬(消費者-生產者)每線程輸出一個后就等待,然后改變自己的標記
臨界資源–使用多個== putX() == 方法,判斷屬于自己的標記(== isEmptyX ==)然后輸出
使多個線程有序的交替執行
代碼:
class Resource{
private boolean isEmpty01 = true;
private boolean isEmpty02 = false;
private boolean isEmpty03 = false;
//每個put方法對應一個輸出,每輸出一個就等待,等待其他人的喚醒
public void put1(){
while(!isEmpty01){
try{
wait();
}catch(InterruptedException e){
e.printStackTrace();
}
}
//輸出后
isEmpty01 = false;
isEmpty02 = true;
notifyAll();
}
public void put2(){
while(!isEmpty02){
try{
wait();
}catch(InterruptedException e){
e.printStackTrace();
}
}
isEmpty02 = false;
isEmpty03 = true;
notifyAll();
}
public void put3(){
while(!isEmpty03){
try{
wait();
}catch(InterruptedException e){
e.printStackTrace();
}
}
isEmpty03 = false;
isEmpty01 = true;
notifyAll();
}
}
class Player01 implements Runnable{
private Resource res;
private String[] arr;
Player01(){}
Player01(String[] arr,Resource res){
this.arr = arr;
this.res = res;
}
public void run(){
synchronized(res){
for(int i=0;i
//錯誤的點
//61,62,這兩句不能交換順序
res.put1();
System.out.print(arr[i]+"-");
try{
Thread.sleep(1000);
}catch(InterruptedException e){
e.printStackTrace();
}
}
}
}
}
class Player02 implements Runnable{
private Resource res;
private String[] arr;
Player02(){}
Player02(String[] arr,Resource res){
this.arr = arr;
this.res = res;
}
public void run(){
synchronized(res){
for(int i=0;i
res.put2();
System.out.print(arr[i]+"-");
try{
Thread.sleep(1000);
}catch(InterruptedException e){
e.printStackTrace();
}
}
}
}
}
class Player03 implements Runnable{
private Resource res;
private String[] arr;
Player03(){}
Player03(String[] arr,Resource res){
this.arr = arr;
this.res = res;
}
public void run(){
synchronized(res){
for(int i=0;i
res.put3();
System.out.print(arr[i]+"## ");
try{
Thread.sleep(1000);
}catch(InterruptedException e){
e.printStackTrace();
}
}
}
}
}
class Test08{
public static void main(String[] args){
String[] arr1 = {"1","3","5","7","9"};
String[] arr2 = {"a","b","c","d","e"};
String[] arr3 = {"2","4","6","8","0"};
Resource res = new Resource();
Player01 p1 = new Player01(arr1,res);
Player02 p2 = new Player02(arr2,res);
Player03 p3 = new Player03(arr3,res);
Thread t1 = new Thread(p1);
Thread t2 = new Thread(p2);
Thread t3 = new Thread(p3);
t1.start();
t2.start();
t3.start();
}
}
執行結果:
重要的是:
這種利用標記可以實現超過2個線程的有序交替執行
原文:https://blog.csdn.net/qq_42701294/article/details/90321329
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