3.25 - 3.26 Java学习总结

多线程

多线程优先级

多线程同步

本来代码照着敲的，结果一运行电脑直接 “起飞” 并且结果也不一样，然后自己加了个else进去（结果还是不同）。

package shuzu.ppy.oo;

public class ThreadSafeTest implements Runnable{
	int num = 10;
	public void run() {
		while(true) {
			if(num > 0) {
				try {
					Thread.sleep(100);
				}catch(Exception e){
					e.printStackTrace();
				}
				System.out.println("tickes: " + num--);
			}
			else {
				break;
			}
		}
	}
	
	public static void main(String[] args) {
		ThreadSafeTest t = new ThreadSafeTest();
		
		Thread tA = new Thread(t);
		Thread tB = new Thread(t);
		Thread tC = new Thread(t);
		Thread tD = new Thread(t);
		
		tA.start();
		//System.out.println("\n-----分隔线-----\n");
		
		tB.start();
		//System.out.println("\n-----分隔线-----\n");
		
		tC.start();
		//System.out.println("\n-----分隔线-----\n");
		
		tD.start();
	}
}

tickes: 10
tickes: 10
tickes: 8
tickes: 9
tickes: 7
tickes: 7
tickes: 7
tickes: 7
tickes: 6
tickes: 6
tickes: 6
tickes: 6
tickes: 5
tickes: 4
tickes: 4
tickes: 3
tickes: 1
tickes: 2
tickes: 2
tickes: 2