synchronized

synchronized
public void test1(){...}

等于
public void test1(){
   synchronized(this){...}
}

对象锁，该对象所有的带synchronized方法都会被锁住。
Vector中add时就会把remove锁住。

private byte[] lock1 = new byte[0];
synchronized(lock){...}
变量锁，锁住一个代码片段，不会影响其他的

package com.hp.hpsc.logservice.client;


public class TestC {
	private byte[] lock1 = new byte[0];
	private byte[] lock2 = new byte[0];
	
	synchronized
	public void test1(){
			System.out.println("test1----------");
			try {
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
	};
	
	
	public void test2(){
		synchronized(this){
			System.out.println("test2----------");
			try {
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
	};
	
	public void test3(){
		synchronized(lock1){
			System.out.println("test3----------");
			try {
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	};
	
	public void test4(){
		synchronized(lock1){
			System.out.println("test4----------");
			try {
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	};
	
	
	public void test5(){
		synchronized(lock2){
			System.out.println("test5----------");
			try {
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	};
	
	public static void main(String[] args) {
		final TestC test = new TestC();
		
		Thread t1 = new Thread(new Runnable() {
			
			@Override
			public void run() {
				test.test1();
			}
		});
		
		Thread t2 = new Thread(new Runnable() {
			
			@Override
			public void run() {
				test.test2();
			}
		});
		
		Thread t3 = new Thread(new Runnable() {
			
			@Override
			public void run() {
				test.test3();
			}
		});
		
		Thread t4 = new Thread(new Runnable() {
			
			@Override
			public void run() {
				test.test4();
			}
		});
		
		Thread t5 = new Thread(new Runnable() {
			
			@Override
			public void run() {
				test.test5();
			}
		});
		t1.start();
		t2.start();
		t3.start();
		t4.start();
		t5.start();
	}
}