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当一个线程进入一个对象的一个synchronized方法后,其它线程是否可进入此对象的其它方法?

2015-06-30 14:00 387 查看
分两种情况

1):进入此对象的非同步方法

答案:可以

2):进入此对象的同步方法

答案:不可以

第一种情况原代码

/**
*
*/
package thread;

/**
* @author Administrator
*
*/
public class TestClass {
/**
* @param args
*/
public static void main(String[] args) {
TestClass tc = new TestClass();
Thread1 t1 = tc.new Thread1(tc);
t1.start();
Thread2 t2 = tc.new Thread2(tc);
t2.start();

}

class Thread1 extends Thread{
TestClass tc = null;
public Thread1(TestClass tc) {
this.tc = tc;
}
@Override
public void run() {
tc.method1();
}
}
class Thread2 extends Thread{
TestClass tc = null;
public Thread2(TestClass tc) {
this.tc = tc;
}
@Override
public void run() {
// TODO Auto-generated method stub
tc.method2();
}
}

public synchronized void method1(){
System.out.println("method1");
try {
Thread.sleep(1000*10);
} catch (InterruptedException e) {
e.printStackTrace();
}

}
public  void method2(){
System.out.println("method2");
}
}


第二种情况原代码

/**
*
*/
package thread;

/**
* @author Administrator
*
*/
public class TestClass {
/**
* @param args
*/
public static void main(String[] args) {
TestClass tc = new TestClass();
Thread1 t1 = tc.new Thread1(tc);
t1.start();
Thread2 t2 = tc.new Thread2(tc);
t2.start();

}

class Thread1 extends Thread{
TestClass tc = null;
public Thread1(TestClass tc) {
this.tc = tc;
}
@Override
public void run() {
tc.method1();
}
}
class Thread2 extends Thread{
TestClass tc = null;
public Thread2(TestClass tc) {
this.tc = tc;
}
@Override
public void run() {
// TODO Auto-generated method stub
tc.method2();
}
}

public synchronized void method1(){
System.out.println("method1");
try {
Thread.sleep(1000*10);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public synchronized void method2(){
System.out.println("method2");
}
}
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