*五大状态
*线程优先级 => 有助于操作系统确定线程的调度顺序但不能保证
*创建线程的三种方式：
通过实现 Runnable 接口；
通过继承 Thread 类本身；
通过 Callable 和 Future 创建线程。
注：新线程创建后必须调用他的start方法才会运行
例子：
1.实现Runnable 接口创建线程
package com.test;
public class RunnableDemo implements Runnable {
private Thread t;
private String threadName;
RunnableDemo( String name) {
threadName = name;
System.out.println("Creating " + threadName );
}
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("Running " + threadName );
try {
for (int i = 4; i > 0; i--) {
System.out.println("Thread: " + threadName + ", " + i);
// 让线程睡眠一会
Thread.sleep(50);
}
} catch (InterruptedException e) {
// TODO: handle exception
System.out.println("Thread " + threadName + " interrupted.");
}
System.out.println("Thread " + threadName + " exiting.");
}
public void start () {
System.out.println("Starting " + threadName );
if (t == null) {
t = new Thread (this, threadName);
t.start ();
}
}
}
2.继承Thread类创建线程
package com.test;
public class ThreadDemo extends Thread{
private Thread t;
private String threadName;
ThreadDemo( String name) {
threadName = name;
System.out.println("Creating " + threadName );
}
public void run(){
System.out.println("Running " + threadName );
try {
for (int i = 4; i > 0; i--) {
System.out.println("Thread: " + threadName + ", " + i);
// 让线程睡眠一会
Thread.sleep(50);
}
} catch (InterruptedException e) {
// TODO: handle exception
System.out.println("Thread " + threadName + " interrupted.");
}
System.out.println("Thread " + threadName + " exiting.");
}
public void start () {
System.out.println("Starting " + threadName );
if (t == null) {
t = new Thread (this, threadName);
t.start ();
}
}
}
//测试线程运行（两种方式）
package com.test;
public class TestThread {
public static void main(String[] args) {
// TODO Auto-generated method stub
//第一种
/*RunnableDemo R1 = new RunnableDemo( "Thread-1");
R1.start();
RunnableDemo R2 = new RunnableDemo( "Thread-2");
R2.start();*/
//第二种
ThreadDemo T1 = new ThreadDemo( "Thread-1");
T1.start();
ThreadDemo T2 = new ThreadDemo( "Thread-2");
T2.start();
}
}
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