Java之synchronized小例

// MyTest.java public class MyTest { public static void main(String[] args) { final ST t = new ST(); new Thread() { public void run() { t.f(); } } .start(); t.g(); } } class ST extends Thread { private int i=0; public void f() { //synchronized synchronized (this) { i=i+2; System.out.println("f().i="+i); } } public void g() { synchronized (this) { i=i-5; System.out.println("g().i="+i); } } }