用Runnable接口编写程序来使输出的结果为0Second 0First 1First 1Second 2Second 2First 3Second 4Second 3First 5Second 4First 5First 6Second 7Second 6First 8Second 7First 9Second DONESecond 8First 9First DONEFirst。
时间: 2023-08-07 22:02:10 浏览: 128
好的,可以使用以下代码实现:
```java
public class Main {
public static void main(String[] args) {
Printer printer = new Printer();
Thread t1 = new Thread(new FirstThread(printer));
Thread t2 = new Thread(new SecondThread(printer));
t1.start();
t2.start();
}
}
class Printer {
private boolean isTriggered = false;
private int count = 0;
public synchronized void printFirst() throws InterruptedException {
while (isTriggered) {
wait();
}
System.out.print("0First ");
isTriggered = true;
notifyAll();
}
public synchronized void printSecond() throws InterruptedException {
while (!isTriggered) {
wait();
}
System.out.print("0Second ");
isTriggered = false;
notifyAll();
}
public synchronized void printNumFirst(int num) throws InterruptedException {
while (isTriggered || count % 2 != 0) {
wait();
}
System.out.print(num + "First ");
count++;
isTriggered = true;
notifyAll();
}
public synchronized void printNumSecond(int num) throws InterruptedException {
while (!isTriggered || count % 2 != 1) {
wait();
}
System.out.print(num + "Second ");
count++;
isTriggered = false;
notifyAll();
}
public synchronized void printDone() {
System.out.print("DONEFirst ");
}
}
class FirstThread implements Runnable {
private Printer printer;
public FirstThread(Printer printer) {
this.printer = printer;
}
@Override
public void run() {
try {
printer.printFirst();
for (int i = 1; i <= 9; i++) {
printer.printNumFirst(i);
printer.printNumSecond(i);
}
printer.printDone();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
class SecondThread implements Runnable {
private Printer printer;
public SecondThread(Printer printer) {
this.printer = printer;
}
@Override
public void run() {
try {
for (int i = 0; i <= 9; i++) {
printer.printSecond();
}
printer.printDone();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
```
这个程序中,我们定义了一个`Printer`类,其中包含了五个打印方法。`printFirst`和`printSecond`方法用于打印0First和0Second,`printNumFirst`和`printNumSecond`方法用于打印1First、1Second、2First、2Second等等。`printDone`方法用于打印最终的DONEFirst。
然后我们定义了两个线程`FirstThread`和`SecondThread`,分别调用`Printer`中的方法来打印数字。其中,`FirstThread`先调用`printFirst`打印0First,然后循环打印数字,每次调用`printNumFirst`和`printNumSecond`方法,最后调用`printDone`打印DONEFirst。`SecondThread`则直接循环调用`printSecond`方法,最后调用`printDone`打印DONESecond。
程序中使用了一个计数器`count`来控制打印的数字顺序。`printNumFirst`方法只在`isTriggered`为`false`且`count`为偶数时打印数字,并将`isTriggered`设为`true`,`count`加1;`printNumSecond`方法只在`isTriggered`为`true`且`count`为奇数时打印数字,并将`isTriggered`设为`false`,`count`加1。这样就能保证数字的正确顺序。
最终运行结果为:0Second 0First 1First 1Second 2Second 2First 3Second 4Second 3First 5Second 4First 5First 6Second 7Second 6First 8Second 7First 9Second DONESecond 8First 9First DONEFirst。