java 多线程小例子2

import java.util.ArrayList;public class ThreadsTest {private ArrayList messages = new ArrayList();public synchronized void put(int i){messages.add(i);System.out.println("in put. messages = " + messages.toString());}public synchronized void remove(){if(messages.size() > 0){messages.remove(0);}System.out.println("in remove. messages = " + messages.toString());}/** * @param args */public static void main(String[] args) {final ThreadsTest threadsTest = new ThreadsTest(); for(int i=0;i<3;i++){new Thread(new Runnable(){@Overridepublic void run() {for(int i=0;i<30;i++){threadsTest.put(i);}}}).start();}for(int i=0;i<3;i++){new Thread(new Runnable(){@Overridepublic void run() {for(int i=0;i<30;i++){threadsTest.remove();}}}).start();}}}