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单选题 运行下列程序时,会发生________ ?public class Test extends Thread { public static void main(String[] args) { Test t = new Test(); t.start(); t.start(); } public void run() { System.out.println("test"); }}
学科：默认课程
时间：2025-06-15 11:22:42
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题目1单选题
分析代码:public class Test implements Runnable { public static void main(String[] args) { Test t = new Test(); } public Test() { Thread t = new Thread(this); t.start(); } public void run() { System.out.println("test"); }}A. 该程序编译并运行,并显示testB. 该程序编译并运行,什么也不显示C. 该程序有一个编译错误,因为在main()方法和构造函数Test()中都定义了tD. 该程序可以正常编译,但无法运行,因为不能在构造函数中使用关键字this
题目2单选题
运行下列程序时,会发生________ ?public class Test extends Thread { public static void main(String[] args) { Test t = new Test(); t.start(); t.start(); } public void run() { System.out.println("test"); }}A. 程序显示test两次B. 程序显示test一次C. 一个java.lang.IllegalThreadStateException异常被抛出,因为您刚刚启动线程,并且在再次启动线程之前线程可能尚未完成D. 没有任何显示
题目3单选题
应在条件上调用_________ 方法使当前线程等待,直到发出条件信号为止A. condition.waiting()B. condition.waited()C. condition.await()D. condition.wait()
题目4单选题
假设有三个可运行任务,task1,task2,task3. 如何在具有2个固定线程的线程池中运行它们A. ExecutorService executor = Executors.newFixedThreadPool(1); executor.execute(task1); executor.execute(task2); executor.execute(task3)B. ExecutorService executor = Executors.newFixedThreadPool(2); executor.execute(task1); executor.execute(task2); executor.execute(task3)C. ExecutorService executor = Executors.newFixedThreadPool(3); executor.execute(task1); executor.execute(task2); executor.execute(task3)D. new Thread(task1).start(); new Thread(task2).start(); new Thread(task3).start()
题目5单选题
应在条件上调用_________ 方法唤醒所有等待的线程A. condition.wakeAll()B. condition.signalAll()C. condition.wake()D. condition.signal()
题目6单选题
下面关于内置监视器的陈述,错误的是_________A. 在对象上调用notify()方法时,如果没有线程在等待对象,则会发生异常B. 调用wait()时,它将暂停线程并同时释放对象上的锁. 在收到通知后重新启动线程时,将自动重新获得锁C. 必须从同步方法或同步块中调用wait(),notify()和notifyAll()方法D. notify()方法只能唤醒一个等待的线程
题目7单选题
java.lang.Thread的________ 方法是静态的A. sleep(long)B. start()C. run()D. join()E. setPriority(int)
题目8单选题
如何创建缓存的线程池A. ExecutorService executor = Executors.newCachedThreadPool()B. ExecutorService executor = Executors.newCachedThreadPool(2)C. ExecutorService executor = Executors.newCachedThreadPool(1)D. ExecutorService executor = Executors.newCachedThreadPool(3)
题目9单选题
Thread类的________ 方法抛出InterruptedException异常A. run()B. start()C. sleep(long)D. setPriority(int)E. yield()
题目10单选题
下列代码的输出结果是_________ ?public class Test { public static void main(String[] args) { new Test(); } public Test() { PrintChar printA = new PrintChar('a', 4); PrintChar printB = new PrintChar('b', 4); printA.run(); printB.run(); } class PrintChar implements Runnable { private char charToPrint; // The character to print private int times; // The times to repeat public PrintChar(char c, int t) { charToPrint = c; times = t; } public void run() { for (int i = 0; i < times; i++) System.out.print(charToPrint); } }}A. 字符a和b随机打印B. aaaabbbbC. ababababD. bbbbaaaa
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