1，synchronized一个类的static变量和public void method()并不排斥
2，类的static synchronized方法和类的普通的synchronized方法并不排斥，可以被2个Thread同时访问。
3，static synchronized的方法之间互诉。
4，普通的synchronized方法之间互诉。
/*
* TestSyncMethod.java
*
* Created on 2005年7月3日, 下午9:57
*
* To change this template, choose Tools | Options and locate the template under
* the Source Creation and Management node. Right-click the template and choose
* Open. You can then make changes to the template in the Source Editor.
*/
package threadtest;
/**
*
* @author larry
*/
public class TestSyncMethod {
public TestSyncMethod() {
}
public static Object staticLock=new Object();
public static Object staticLock1=new Object();
private boolean canGo=false;
public static TestSyncMethod test=new TestSyncMethod();
public static String getThreadName(){
return Thread.currentThread().getName();
}
public synchronized void methodOne(){
print(getThreadName()+":::enter method one");
try{
Thread.sleep(3000);
}catch(Exception e){}
print(getThreadName()+":::sleep over");
while(!canGo){
try{
this.wait();
}catch(Exception e){}
}
print(getThreadName()+":::over");
}
public synchronized void methodTwo(){
print(getThreadName()+":::enter method two");
canGo=true;
this.notifyAll();
}
public void print(String str){
System.out.println(str);
}
Thread t1=new Thread(new Runnable(){
public void run(){
TestSyncMethod.test.methodOne();
}
}
);
Thread t2=new Thread(new Runnable(){
public void run(){
TestSyncMethod.test.methodTwo();
}
}
);
Thread t3=new Thread(new Runnable(){
public void run(){
print(getThreadName()+":::start t3");
synchronized(TestSyncMethod.staticLock){
print(getThreadName()+":::enter lock t3");
try{
Thread.sleep(6000);
}catch(Exception e){
}
print(getThreadName()+":::over");
}
}
}
);
Thread t4=new Thread(new Runnable(){
public void run(){
print(getThreadName()+":::start t4");
synchronized(TestSyncMethod.staticLock1){
print(getThreadName()+":::enter lock t4");
try{
Thread.sleep(6000);
}catch(Exception e){
}
print(getThreadName()+":::over");
}
}
}
);
public static void main(String[] args){
TestSyncMethod tt=new TestSyncMethod();
tt.t3.start();
tt.t4.start();
tt.t1.start();
tt.t2.start();
}
}
init:
deps-jar:
Compiling 1 source file to F:\Documents and Settings\larry\ThreadTest\build\classes
compile-single:
run-single:
Thread-6:::start t3
Thread-6:::enter lock t3
Thread-7:::start t4
Thread-7:::enter lock t4
Thread-4:::enter method one
Thread-4:::sleep over
Thread-5:::enter method two
Thread-4:::over
Thread-6:::over
Thread-7:::over
BUILD SUCCESSFUL (total time: 7 seconds)
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