问题:
class Waiting implements Runnable {
boolean flag = false;
public synchronized void run() {
if (flag) {
flag = false;
System.out.print("1 ");
try { this.wait(); } catch (Exception e) { }
System.out.print("2 ");
}
else {
flag = true;
System.out.print("3 ");
try { Thread.sleep(2000); } catch (Exception e) { }
System.out.print("4 ");
notify();
}
}
public static void main(String [] args) {
Waiting w = new Waiting();
new Thread(w).start();
new Thread(w).start ();
}
}
以下哪两项是正确的?()
A . 代码输出 1 3 4
B . 代码输出 3 4 1
C . 代码输出 1 2 3 4
D . 代码不会完成
class Waiting implements Runnable {
boolean flag = false;
public synchronized void run() {
if (flag) {
flag = false;
System.out.print("1 ");
try { this.wait(); } catch (Exception e) { }
System.out.print("2 ");
}
else {
flag = true;
System.out.print("3 ");
try { Thread.sleep(2000); } catch (Exception e) { }
System.out.print("4 ");
notify();
}
}
public static void main(String [] args) {
Waiting w = new Waiting();
new Thread(w).start();
new Thread(w).start ();
}
}
以下哪两项是正确的?()
● 参考解析
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