本文转载至：http://lavasoft.blog.51cto.com/62575/99153
一. 线程状态类型
1. 新建状态（New）：新创建了一个线程对象。
2. 就绪状态（Runnable）：线程对象创建后，其他线程调用了该对象的start()方法。该状态的线程位于可运行线程池中，变得可运行，等待获取CPU的使用权。
3. 运行状态（Running）：就绪状态的线程获取了CPU，执行程序代码。
4. 阻塞状态（Blocked）：阻塞状态是线程因为某种原因放弃CPU使用权，暂时停止运行。直到线程进入就绪状态，才有机会转到运行状态。阻塞的情况分三种：
（一）、等待阻塞：运行的线程执行wait()方法，JVM会把该线程放入等待池中。
（二）、同步阻塞：运行的线程在获取对象的同步锁时，若该同步锁被别的线程占用，则JVM会把该线程放入锁池中。
（三）、其他阻塞：运行的线程执行sleep()或join()方法，或者发出了I/O请求时，JVM会把该线程置为阻塞状态。当sleep()状态超时、join()等待线程终止或者超时、或者I/O处理完毕时，线程重新转入就绪状态。
5. 死亡状态（Dead）：线程执行完了或者因异常退出了run()方法，该线程结束生命周期。
二. 线程状态图
// 线程 NEW 状态
Thread one = new Thread();
System.out.println("thread_one status is:" +
one.getState().toString());
// 线程RUNNABLE 状态
Thread two = new Thread() {
@Override
public void run() {
// TODO Auto-generated method stub
for (int i = 0; i < 100; i++) {
System.out.println("i value is :" + i);
}
}
};
two.start();
System.out.println("thread_two status is:" + two.getState().toString());第一种情况：对象锁定阻塞（锁定阻塞）
final Object obj = new Object();
Runnable block_one = new Runnable() {
public void run() {
synchronized (obj) {
for (int i = 0; i < 1000; i++) {
System.out.println("i value is:" + i);
}
}
}
};
Thread thread_block_one = new Thread(block_one);
Thread thread_block_two = new Thread(block_one);
thread_block_one.start();
thread_block_two.start();
System.out.println("thread_block_one status is:"
+ thread_block_one.getState().toString());
System.out.println("thread_block_two status is:"
+ thread_block_two.getState().toString());运行截图：
// 线程TIMED_WAITING 状态 :基于Thread.sleep
Runnable block_one = new Runnable() {
public void run() {
for (int i = 0; i < 100; i++) {
System.out.println("i value is:" + i);
}
}
};
Runnable block_two = new Runnable() {
public void run() {
for (int i = 0; i < 100; i++) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
System.out
.println("error message is:" + e.getMessage());
}
System.out.println("i value is:" + i);
}
}
};
Thread sleep_thread_block_one = new Thread(block_one);
Thread sleep_thread_block_two = new Thread(block_two);
sleep_thread_block_one.start();
sleep_thread_block_two.start();
System.out.println("thread_block_one status is:"
+ sleep_thread_block_one.getState().toString());
System.out.println("thread_block_two status is:"
+ sleep_thread_block_two.getState().toString());
// 线程TIMED_WAITING 状态 :基于Thread.join()
Runnable block_one = new Runnable() {
public void run() {
for (int i = 0; i < 100; i++) {
System.out.println("i value is:" + i);
}
}
};
Runnable block_two = new Runnable() {
public void run() {
for (int i = 0; i < 100; i++) {
try {
Thread.currentThread().join(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out
.println("error message is：" + e.getMessage());
}
System.out.println("i value is:" + i);
}
}
};
Thread sleep_thread_block_one = new Thread(block_one);
Thread sleep_thread_block_two = new Thread(block_two);
sleep_thread_block_one.start();
sleep_thread_block_two.start();
System.out.println("thread_block_one status is:"
+ sleep_thread_block_one.getState().toString());
System.out.println("thread_block_two status is:"
+ sleep_thread_block_two.getState().toString());
第三种：调用Object.wait(),进入等待阻塞
final Object lock = new Object();
Thread t1 = new Thread() {
@Override
public void run() {
for (int i = 0; i < 100; i++) {
synchronized (lock) {
try {
lock.wait();
} catch (InterruptedException e) {
}
System.out.println("t1 value is:" + i);
}
}
}
};
Thread t2 = new Thread() {
@Override
public void run() {
for (int j = 0; j < 100; j++) {
synchronized (lock) {
for (int i = 0; i < 10; i++) {
System.out.println(i);
}
lock.notifyAll();
}
}
}
};
t1.setName("one");
t2.setName("two");
t1.start();
t2.start();
System.out.println("t1 status is:" + t1.getState().toString());
System.out.println("t2 status is:" + t2.getState().toString());
