Main:
public class Main {
// static volatile int i =0;
public static void main(String[] args) {
Person p = new Person("xiaoming");
for(int j=0;j<1000;j++){
new Thread(new Runnable() {
@Override
public void run() {
synchronized (this){
try {
p.add();
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
System.out.println(Person.age+"*******");
}
}).start();
}
try {
new Thread().sleep(500);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
System.out.println(Person.age);
}
Person.class:
package pj.imcp;
public class Person {
public Person(String name) {
this.name = name;
}
public void setName(String name) {
this.name = name;
}
public void setAge(int age) {
this.age = age;
}
public String name;
public volatile static int age;
public Person(int age) {
this.age = age;
}
public synchronized void add() throws InterruptedException {
this.age++;
}
}
//当某个变量或方法需要被类的所有实例共享时，可以使用static修饰
//并发3个特性：可见性，有序性，原子性
