在同一个线程中创建的是统一个对像，获取的hashcode值是一样的，直接上代码了，写的不好不要介意！
public static void main(String[] args) {
for (int i = 0; i < 2; i++) {
new Thread(new Runnable() {
@Override
public void run() {
UserService us = UserService.getInstance();
System.out.println(Thread.currentThread().getName()+" "+us );
A a = new A();
B b = new B();
a.print();
b.print();
}
}).start();
}
}
static class A{
public void print() {
UserService us = UserService.getInstance();
System.out.println("从A中获取："+Thread.currentThread().getName()+"..."+us);
}
}
static class B{
public void print() {
UserService us = UserService.getInstance();
System.out.println("从B中获取："+Thread.currentThread().getName()+"..."+us);
}
}
}
打印：
Thread-0 com.test.UserService@10b7ce35
Thread-1 com.test.UserService@407e3dad
从A中获取：Thread-1...com.test.UserService@407e3dad
从A中获取：Thread-0...com.test.UserService@10b7ce35
从B中获取：Thread-0...com.test.UserService@10b7ce35
从B中获取：Thread-1...com.test.UserService@407e3dad