java線程同步

標籤：線程同步   鎖   

/* 同步的前題： 1.必須要有兩個或以上線程 2.必須是多個線程使用一個鎖 優點：解決多安全執行緒問題 弊端：多個線程判斷鎖，消耗資源 */package pack;public class Main {    public static void main(String[] args) {        // TODO Auto-generated method stub        Ticket t = new Ticket();        Thread t1 = new Thread(t);        Thread t2 = new Thread(t);        Thread t3 = new Thread(t);        Thread t4 = new Thread(t);        t1.start();        t2.start();        t3.start();        t4.start();     }    public static void sys(Object obj) {        System.out.println(obj);    }}/*class Ticket implements Runnable {     //同步代碼塊    Object obj = new Object();    private int tick = 100;    public void run() {        while(true) {            synchronized(obj) {                if(tick>0)                Main.sys(Thread.currentThread().getName()+"---"+tick--);            }        }    }}*/class Ticket implements Runnable {     //同步函數    Object obj = new Object();    private int tick = 100;    public void run() {        while(true) {            show();            }           }    public synchronized void show() {           if(tick>0)            Main.sys(Thread.currentThread().getName()+"---"+tick--);    }}

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java線程同步