最后一种方式的示例:
设计5个线程,其中三个线程每次对j增加1,另外两个线程对j每次减少1
package com.iot.thread;
public class MutiThreadShareData {
private static MutiShareData mutiShareData = new MutiShareData();
public static void main(String[] args) {
for(int i=0;i<3;i++){
new Thread(
new Runnable() {
@Override
public void run() {
System.out.println(Thread.currentThread()+":{j from "+ mutiShareData.getJ()+" + to: "+mutiShareData.increment()+"}");
}
}
).start();
}
for(int i=0;i<2;i++){
new Thread(
new Runnable() {
@Override
public void run() {
System.out.println(Thread.currentThread()+":{j from "+ mutiShareData.getJ()+" - to: "+mutiShareData.decrement()+"}");
}
}
).start();
}
}
}
/**
* 将共享数据封装在另一对象中(操作数据的方法也在该对象完成)
*/
class MutiShareData{
private int j = 0;
public synchronized int increment(){
return ++j;
}
public synchronized int decrement(){
return --j;
}
public synchronized int getJ() {
return j;
}
public synchronized void setJ(int j) {
this.j = j;
}
}