用第二種方法創造 Thread 也就是 runnable interface
新增 MyRunnable.java
package thread;import static thread.ThreadColor.ANSI_RED;public class MyRunnable implements Runnable{
@Override
public void run() {
System.out.println(ANSI_RED + " Hello from MyRunnable's implementation of run()");
}
}
AnotherThread.java
package thread;import static thread.ThreadColor.ANSI_BLUE;public class AnotherThread extends Thread{
@Override
public void run() {
System.out.println(ANSI_BLUE + "Hello from AnotherThread.");
}
}
Main.java
package thread;import static thread.ThreadColor.*;public class Main { public static void main(String[] args) {
System.out.println(ANSI_PURPLE + "Hello from the main thread."); Thread anotherThread = new AnotherThread();
anotherThread.start(); new Thread() {
@Override
public void run() {
System.out.println(ANSI_GREEN + "Hello from the anonymous class thread.");
}
}.start(); Thread myRunnableThread = new Thread(new MyRunnable());
myRunnableThread.start(); System.out.println(ANSI_CYAN + "Hello again from the main thread.");
}
}
輸出結果：
Hello from the main thread.
Hello from the anonymous class thread.
Hello from AnotherThread.
Hello again from the main thread.
Hello from MyRunnable’s implementation of run()
package thread;import static thread.ThreadColor.*;public class Main { public static void main(String[] args) {
System.out.println(ANSI_PURPLE + "Hello from the main thread."); Thread anotherThread = new AnotherThread();
anotherThread.start(); new Thread() {
@Override
public void run() {
System.out.println(ANSI_GREEN + "Hello from the anonymous class thread.");
}
}.start(); Thread myRunnableThread = new Thread(new MyRunnable());
myRunnableThread.start(); Thread myRunnableThread2 = new Thread(new MyRunnable(){
@Override
public void run() {
System.out.println(ANSI_BLACK + "Hello from anonymous MyRunnable class.");
super.run();
}
});
myRunnableThread2.start(); System.out.println(ANSI_CYAN + "Hello again from the main thread.");
}
}
輸出結果：
Hello from the main thread.
Hello from AnotherThread.
Hello from the anonymous class thread.
Hello from MyRunnable’s implementation of run()
Hello again from the main thread.
Hello from MyRunnable’s implementation of run()
一樣也可以用 anonymous 來實現
因為有用 super.run() 所以原來的 method 也被調用了，所以輸出結果重複同個句子了兩次
不想重複調用的話，去掉就行，那就只會顯示 anonymous 這個 method
修改 AnotherThread.java
package thread;import static thread.ThreadColor.ANSI_BLUE;public class AnotherThread extends Thread{
@Override
public void run() {
System.out.println(ANSI_BLUE + "Hello from " + currentThread().getName());
}
}
修改 Main.java
package thread;import static thread.ThreadColor.*;public class Main { public static void main(String[] args) {
System.out.println(ANSI_PURPLE + "Hello from the main thread."); Thread anotherThread = new AnotherThread();
anotherThread.setName(" == Another Thread == ");
anotherThread.start(); new Thread() {
@Override
public void run() {
System.out.println(ANSI_GREEN + "Hello from the anonymous class thread.");
}
}.start(); Thread myRunnableThread = new Thread(new MyRunnable());
myRunnableThread.start(); Thread myRunnableThread2 = new Thread(new MyRunnable(){
@Override
public void run() {
System.out.println(ANSI_BLACK + "Hello from anonymous MyRunnable class.");
// super.run();
}
});
myRunnableThread2.start(); System.out.println(ANSI_CYAN + "Hello again from the main thread.");
}
}
輸出結果：
Hello from the main thread.
Hello again from the main thread.
Hello from the anonymous class thread.
Hello from anonymous MyRunnable class.
Hello from MyRunnable’s implementation of run()
Hello from MyRunnable’s implementation of run()
Hello from == Another Thread ==
修改
Thread anotherThread = new AnotherThread();
anotherThread.setName(" == Another Thread == ");
anotherThread.run();輸出結果：
Hello from the main thread.
Hello from main
Hello from the anonymous class thread.
Hello from MyRunnable’s implementation of run()
Hello again from the main thread.
Hello from anonymous MyRunnable class.
Tim 說我們使用上常見的錯誤有
沒有用 start() 而是用 run()
從這邊可以看出差別就是，前者有新增一個 thread，而後者只是在原本的 thread 上執行
修改 AnotherThread.java
package thread;import static thread.ThreadColor.ANSI_BLUE;public class AnotherThread extends Thread {
@Override
public void run() {
System.out.println(ANSI_BLUE + "Hello from " + currentThread().getName()); try {
// 3 sec
Thread.sleep(3000);
} catch (InterruptedException e) {
System.out.println(ANSI_BLUE + " Another thread woke me up");
} System.out.println(ANSI_BLUE + "Three seconds have passed and I'm awake.");
}
}
輸出結果：
Hello from the main thread.
Hello again from the main thread.
Hello from the anonymous class thread.
Hello from MyRunnable’s implementation of run()
Hello from anonymous MyRunnable class.
Hello from == Another Thread ==
Three seconds have passed and I’m awake.
在 Thread 裡面加入睡眠 3 秒
如果被其他 Thread 打斷就走到 catch 裡面
因為沒被打斷所以就像輸出顯示的一樣往下走了