黑马程序员——Java基础---线程的另一个总结（3）--互斥，线程锁

synchronized要达到同步效果关键是“锁对象必须是同一个”，同一个对象可以用this,同一个类中可以使用 类名.class

示例代码

创建所有两种方式，一个是用synchronized括起来要执行的代码，另一个是直接在方法上加synchronized。

public class TraditionalThreadSynchronized {

/**
* @param args
*/
public static void main(String[] args) {
new TraditionalThreadSynchronized().init();
}

private void init(){
final Outputer outputer = new Outputer();
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputer.output("zhangxiaoxiang");
}

}
}).start();

new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputer.output2("lihuoming");
}

}
}).start();

}

static class Outputer{
//创建锁的方式1
public void output(String name){
int len = name.length();
synchronized (this)
{
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
//创建锁的方式2
public synchronized void output2(String name){
int len = name.length();
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}

}
}

方法3中使用了static方法，比用使用同一个字节码，得用字节码文件 类名.class

public class TraditionalThreadSynchronized {

/**
* @param args
*/
public static void main(String[] args) {
new TraditionalThreadSynchronized().init();
}

private void init(){
final Outputer outputer = new Outputer();
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputer.output("zhangxiaoxiang");
}

}
}).start();

new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputer.output3("lihuoming");
}

}
}).start();

}

static class Outputer{

public void output(String name){
int len = name.length();
synchronized (Outputer.class)
{
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}

public synchronized void output2(String name){
int len = name.length();
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}

public static synchronized void output3(String name){
int len = name.length();
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
}