【代码】CountDownLatch使用

Bertha 。 2023-10-06 08:18 4阅读 0赞

import java.util.concurrent.CountDownLatch;
    
    public class T06_TestCountDownLatch {
        
        public static void main(String[] args) {
        
            usingJoin();
            usingCountDownLatch();
        }
    
        private static void usingCountDownLatch() {
        
            Thread[] threads = new Thread[10000];
            CountDownLatch latch = new CountDownLatch(threads.length);
    
            for(int i=0; i<threads.length; i++) {
        
                threads[i] = new Thread(()->{
        
                    int result = 0;
                    for(int j=0; j<1000000000; j++) result += j;
                    latch.countDown();
                });
            }
    
            for (int i = 0; i < threads.length; i++) {
        
                threads[i].start();
            }
    
            try {
        
                latch.await();
            } catch (InterruptedException e) {
        
                e.printStackTrace();
            }
    
            System.out.println("end latch");
        }
    
        private static void usingJoin() {
        
            Thread[] threads = new Thread[100];
    
            for(int i=0; i<threads.length; i++) {
        
                threads[i] = new Thread(()->{
        
                    int result = 0;
                    for(int j=0; j<10000; j++) result += j;
                });
            }
    
            for (int i = 0; i < threads.length; i++) {
        
                threads[i].start();
            }
    
            for (int i = 0; i < threads.length; i++) {
        
                try {
        
                    threads[i].join();
                } catch (InterruptedException e) {
        
                    e.printStackTrace();
                }
            }
    
            System.out.println("end join");
        }
    }

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