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java線程學習1——線程基本概念和操作
一、創建線程的兩種方式
1 繼承Runnable接口
public class ThreadImpRunnable implements Runnable
{
/**
* 線程運行時執行的方法
*/
public void run()
{
for (int i = 0; i < 500; i++)
{
System.out.println(Thread.currentThread().getName() + i);
}
}
}
public class Test
{
/**
* 主線程，啟動線程必須是start方法
*/
public static void main(String[] args)
{
ThreadImpRunnable tr = new ThreadImpRunnable();
Thread t = new Thread(tr);
t.start();
for (int i = 0; i < 500; i++)
{
System.out.println(Thread.currentThread().getName() + i);
}
}
}
2 繼承Thread類
public class ThreadExtends extends Thread
{
/**
* 線程運行時執行的方法
*/
public void run()
{
for (int i = 0; i < 500; i++)
{
System.out.println(Thread.currentThread().getName() + i);
}
}
}
public class Test
{
/**
* 主線程，啟動線程必須是start方法
*/
public static void main(String[] args)
{
ThreadExtends tr = new ThreadExtends();
tr.start();
for (int i = 0; i < 500; i++)
{
System.out.println(Thread.currentThread().getName() + i);
}
}
}
二、線程的一些方法
1 sleep
public class SleepThread implements Runnable
{
/**
* 線程運行時執行的方法
*/
public void run()
{
try
{
// 該線程進入阻塞狀態5秒
Thread.sleep(5000);
for (int i = 0; i < 500; i++)
{
System.out.println(Thread.currentThread().getName() + i);
}
}
catch (InterruptedException e)
{
// 若調用該線程的interrupt方法，會報該異常，真實程序中可以關閉一些資源
e.printStackTrace();
}
}
}
public class SleepTest
{
/**
* 主線程
*/
public static void main(String[] args)
{
SleepThread tr = new SleepThread();
Thread t = new Thread(tr);
t.start();
for (int i = 0; i < 500; i++)
{
System.out.println(Thread.currentThread().getName() + i);
}
}
}
2 Join
public class JoinThread implements Runnable
{
public void run()
{
for (int i = 0; i < 100; i++)
{
System.out.println(Thread.currentThread().getName() + i);
}
}
}
public class JoinTest
{
public static void main(String[] args)
{
JoinThread jt = new JoinThread();
Thread t = new Thread(jt);
t.start();
try
{
// 調用該方法將當前線程（此處是主線程）合並到本線程中，執行完本線程，再執行當前線程
t.join();
}
catch (InterruptedException e)
{
e.printStackTrace();
}
for (int i = 0; i < 100; i++)
{
System.out.println(Thread.currentThread().getName() + i);
}
}
}
3 yield
public class YieldThread extends Thread
{
public void run()
{
for (int i = 0; i < 100; i++)
{
System.out.println(Thread.currentThread().getName() + i);
if (i % 10 == 0)
{
// 當能被10整除時本線程讓出優先級，讓其他線程先執行一會，可看到t1_10下麵緊接著t2的結果，同樣t2_20下麵緊接著t1的結果
yield();
}
}
}
}
public class YieldTest
{
public static void main(String[] args)
{
YieldThread yt = new YieldThread();
Thread t1 = new Thread(yt, "t1_");
t1.start();
Thread t2 = new Thread(yt, "t2_");
t2.start();
}
}
4 setPriority
public class PriorityThread extends Thread
{
public void run()
{
for (int i = 0; i < 100; i++)
{
System.out.println(Thread.currentThread().getName() + i);
}
}
}
public class PriorityTest
{
/**
* 線程優先級默認是5
*/
public static void main(String[] args)
{
int norm = Thread.NORM_PRIORITY; // 5
int max = Thread.MAX_PRIORITY; // 10
int min = Thread.MIN_PRIORITY; // 1
PriorityThread yt = new PriorityThread();
Thread t1 = new Thread(yt, "t1_");
t1.setPriority(norm + 3);
t1.start();
Thread t2 = new Thread(yt, "t2_");
t2.start();
}
}
最後更新：2017-04-04 07:32:09