1、Runnable是一個接口，當實現該接口時需要復用run方法，在run方法中實現自己的邏輯。
2、Thread是一個類，它其實實現了Runnable方法，也就是說當你通過new 一個Thread得到一個線程實例時，其實就是重寫runnable裡面的run方法。當你通過實現runnable創建一個線程實例時，你需要將runnable實例傳遞一個thread，然後通過.start開啟線程。
3、Runnable可以線程同步，但是Thread不可以線程同步，例如一共有10張票，你可以開啟3個線程同時賣票，如果你通過繼承thread創建一個賣票的類，實例化3個線程會各自賣10張票，一共就賣出了30張，當時你通過實現runnable所創建的賣票類，只需要實例化一個對象，將一個對象傳遞給三個thread，然後開啟三個線程，你會發現三個線程一共只會賣10張。
4、以下是賣票的代碼
package com.shine.test;
/**
* 通過繼承thread的賣票類
* @author ASUS
*
*/
public class MyThread extends Thread {
public int ticks = 10;
boolean flag = true;
public MyThread(String string) {
this.setName(string);
}
@Override
public void run() {
while(flag){
saleTick();
}
}
public void saleTick() {
if(ticks > 0){
ticks--;
System.out.println(Thread.currentThread().getName()+":"+ticks);
}else{
flag = false;
}
}
}
package com.shine.test;
/**
* 通過實現Runnable的賣票類
* @author ASUS
*
*/
public class MyRunnable implements Runnable {
public int ticks = 10;
boolean flag = true;
@Override
public void run() {
while(flag){
saleTick();
}
}
public void saleTick() {
if(ticks > 0){
ticks--;
System.out.println(Thread.currentThread().getName()+":"+ticks);
}else{
flag = false;
}
}
}
package com.shine.test;
public class Test {
/**測試
* @param args
*/
public static void main(String[] args) {
MyThread myThread1 = new MyThread("thread1");
MyThread myThread2 = new MyThread("thread2");
MyThread myThread3 = new MyThread("thread3");
myThread1.start();
myThread2.start();
myThread3.start();
MyRunnable myRunnable = new MyRunnable();
Thread runnable1 = new Thread(myRunnable);
Thread runnable2 = new Thread(myRunnable);
Thread runnable3 = new Thread(myRunnable);
runnable1.setName("runnable1");
runnable2.setName("runnable2");
runnable3.setName("runnable3");
runnable1.start();
runnable2.start();
runnable3.start();
}
}
結果：
thread1:9 thread1:8 thread1:7 thread1:6 thread1:5 thread1:4 thread1:3 thread1:2 thread1:1 thread1:0 thread2:9 thread2:8 thread2:7 thread2:6 thread2:5 thread2:4 thread2:3 thread2:2 thread2:1 thread2:0 thread3:9 runnable1:9 runnable1:8 runnable1:7 runnable1:6 runnable1:5 runnable1:4 runnable1:3 runnable1:2 runnable1:1 runnable1:0 thread3:8 thread3:7 thread3:6 thread3:5 thread3:4 thread3:3 thread3:2 thread3:1 thread3:0
由於系統自身的線程選擇問題 全部由runnable1完成了賣票 但總共只賣出了10張 thread的則賣出了30張
