public class A extends Thread {  A() {  setDaemon(true);  }  public void run() {  (new B()).start();  try {  Thread.sleep(60000);  } catch (InterruptedException x) {}  System.out.println(“A done”);  }  class B extends Thread {  public void run() {  try {  Thread.sleep(60000);  } catch (InterruptedException x) {}  System.out.println(“B done”);  }  }  public static void main(String[] args) {  (new A()).start();  }  }   What is the result?()  A、 A doneB、 B doneC、 A done B doneD、 B done A doneE、 There is no exception that the application will print anything.F、 The application outputs “A done” and “B done”, in no guaranteed order.

public class A extends Thread {  A() {  setDaemon(true);  }  public void run() {  (new B()).start();  try {  Thread.sleep(60000);  } catch (InterruptedException x) {}  System.out.println(“A done”);  }  class B extends Thread {  public void run() {  try {  Thread.sleep(60000);  } catch (InterruptedException x) {}  System.out.println(“B done”);  }  }  public static void main(String[] args) {  (new A()).start();  }  }   What is the result?()  

  • A、 A done
  • B、 B done
  • C、 A done B done
  • D、 B done A done
  • E、 There is no exception that the application will print anything.
  • F、 The application outputs “A done” and “B done”, in no guaranteed order.

相关考题:

( 28 )阅读下面程序1 public class Try extends Thread{2 public static void main(String args[ ]){3 Try t = new Try( );4 t.start( );5 }67 public void run( int j){8 int i = 0;9 while(i5){10 System.out.println(" 祝你成功! ");11 i++;12 }13 }14 }该程序要求打印 5 行 “ 祝你成功! ” ,必须改正程序中的某行代码,程序才能完成。选择正确的修改是A )将第 1 行的 extends Thread 改为 implements RunnableB )将第 3 行的 new Try() 改为 new Thread()C )将第 4 行 t.start() 改为 start(t)D )将第 7 行的 public void run( int j) 改为 public void run()

下列程序的功能是在监控台上每隔一秒钟显示一个字符串“你好!”,能够填写在程序中画线位置,使程序完整并能正确运行的语句是 public class Exam implements Runnable{ public static void main(String args[]){ Exam t=new Exam(); Thread tt=new Thread(t); tt.start(); } public void run(){ for(;;){ try{ ; }catch(e){} System.out.println("你好!"); } } }A.sleep(1) RuntimeExceptionB.t.sleep(1000) InterruptedExceptionC.Thread.sleep(1) InterruptedExceptionD.Thread.sleep(1000) InterruptedException

下面程序的功能是创建一个显示5个“Hello!”的线程并启动运行。请将程序补充完整。public class ThreadTest extends Thread {public static void main(String args[]) {ThreadTest t=new ______;t.start();}public void run() {int i=0;while(true) {System.out.println("Hello!");if(i++==4)break;}}}

下列哪个方法可用于创建一个可运行的类? ( )A.public class X implements Runable {public void run(){...,.,}}B.public class X implements Thread {public void run(){......}}C.public class X implements Thread {public int run(){……}}D.public class X implements Runable {protected void run(){.....}}

下列程序通过设定线程优先级,抢占主线程的CPU,选择正确的语句填入横线处。 class T14 implements Runnable { private Boolean fStop - true; public void run() { while(fStop) { System.out.println(Thread.currentThread().getName() + "run"); try { Thread.sleep(l); } catch(Exception e) { e.printStackTrace(); } } } public void stopRun() { fStop = false; } } public class Testl4 { public static void main(String[] args) { T14 t14 = new T14(); Thread t1 = new Thread(ti4, "T14"); Thread t = Thread.currentThread()'; ______; Ti.start(); T14.stopRun(); System.out.println ( "stop "); } }A.setPriority(Thread. MIN_PRIORITY)B.t1 .setPriority(Thread. MIN_PRIORITY)C.t.setPfiofity(Thread. MIN_PRIORITY)D.t14.setPriority(Thread. MIN_PRIORITY)

下列程序的执行结果是______。 class A5 extends Thread { boolean b; A5 (boolean bb) { b = bb; } public void run() { System.out.println(this.getName() + "运行"); } } public class Testl5 { public static void main(String[] args) { A5 a1 = new A5(true); A5 a2 = new A5(false); if(a1.b) A1.start(); if (a2 .b) A2.start(); } }A.Thread-0B.Thread-1C.Thread-0D.Thread-1 Thread-1 Thread-0

阅读下面程序 1 public class Try extends Thread{ 2 public static void main(String args[]){ 3 Try t=new Try(); 4 t.start(); 5 } 6 7 public void run(int j){ 8 int i=0; 9 while(i<5){ 10 System.out.println(“祝你成功!”); 11 i++; 12 } 13 } 14 } 该程序要求打印5行“祝你成功!”,必须改正程序中的某行代码,程序才能完成。选择正确的修改是A.将第1行的extends Thread改为implements RunnableB.将第3行的new Try()改为new Thread()C.将第4行t.start()改为start(t)D.将第7行的public void run(int j)改为public void run()

阅读下面程序 public class Test2______ { public static void main(String[] args){ Thread t=new Test2(); t. start(); } public void run(){ System. out. priatln("How are you. "); } } 在程序下画线处填入的正确的选项是A.implements ThreadB.extends RunnableC.implements RunnableD.extends Thread

在下面程序的下画线处应填入的选项是 public class Test______{ public static void main(String args[]) { Test t=new Test(); Thread tt=new Thread(t); tt.start(); } public void run() { for(int i=0;i<5;i++) System.out.println("i="+i); } }A.implements RunnableB.extends ThreadC.implements ThreadD.extends Runnable

下列程序创建了一个线程并运行,横线处应填入的正确代码是( )。 public class Try extends Thread{ public static void main(String args[]){ Thread t=new Try; ; } public void runf System.out.println(”Try!"); } }A.t.startB.t.classC.t.threadD.t.static

3阅读下面程序 1 public class Try extends Thread{ 2 public static void main(String args[ ]){ 3 Try t = new Try( ); 4 t.start( ); 5 } 6 7 public void run( int j){ 8 int i = 0; 9 while(i<5) { 10 System.out.pfintln("祝你成功"); 11 i++; 12 } 13 } 14 } 该程序要求打印5行“祝你成功”必须改正程序中的某行代码,程序才能完成。选择正确的修改是( )。A.将第1行的extends Thread改为implements RunnableB.将第3行的new Try()改为new Thread()C.将第4行t.sta.rt()改为start(t)D.将第7行的publ void run(int j)改为public void run()

阅读下面程序 public class Test2 ______ { public static void main(String[] args) { Thread t=new Test2(); t.start(); } public void run() { System.out.println("How are you."); } } 程序中下画线处应填入的正确选项是A.implements ThreadB.extends RunnableC.implements RunnableD.extends Thread

下列程序创建了一个线程并运行,请在下划线处填入正确代码。public class Try extends Thread{public static void main(String args[]){Threadt=new Try();【 】;}public void run(){System.out.println(“Try!”);}}

( 30 )在程序的下划线处应填入的选项是public class Test _________{public static void main(String args[]){Test t = new Test();Thread tt = new Thread(t);tt.start();}public void run(){for(int i=0;i5;i++){system.out.println( " i= " +i);}}}A ) implements RunnableB ) extends ThreadC ) implements ThreadD ) extends Runnable

class MyThread extends Thread {  public void run() { System.out.println(“AAA”); }  public void run(Runnable r) { System.out.println(“BBB”); }  public static void main(String[] args) {  new Thread(new MyThread()).start();  }  }   What is the result?()  A、 AAAB、 BBBC、 Compilation fails.D、 The code runs with no output.

Which two code fragments will execute the method doStuff() in a separate thread?()A、 new Thread() { public void run() { doStuff(); } }B、 new Thread() { public void start() { doStuff(); } }C、 new Thread() { public void start() { doStuff(); } } .run();D、 new Thread() { public void run() { doStuff(); } } .start();E、 new Thread(new Runnable() { public void run() { doStuff(); } } ).run();F、 new Thread(new Runnable() { public void run() { doStuff(); } }).start();

5. class Order2 implements Runnable {  6. public void run() {  7. for(int x = 0; x 〈 4; x++) {  8. try { Thread.sleep(100); } catch (Exception e) { }  9. System.out.print("r");  10. } }  11. public static void main(String [] args) {  12. Thread t = new Thread(new Order2());  13. t.start();  14. for(int x = 0; x 〈 4; x++) {  15. // insert code here  16. System.out.print("m");  17. } } }  哪一个插入到第15行,最有可能产生输出 rmrmrmrm ?()  A、Thread.sleep(1);B、Thread.sleep(100);C、Thread.sleep(1000);D、try { Thread.sleep(100); } catch (Exception e) { }

现有:  5.  class Order2 implements Runnable  {     6.    public void run()  {     7. for (int x- o;  x4;  x++)  {  8. try{Thread.sleep(100);  )catch  (Exception e)  {  }     9.    System.out.print("r");     10.    }  }  11.    public static void main(string  []  args)  {     12.    Thread t=new Thread(new order2());     13.    t.start();  14.    for(int x=0;  x4;  x++)  {     15.    //insert code here     16.    System.out.print("m");     17.  }  }  }  哪一个插入到第15行,最有可能产生输出 rmrmrmrm?()     A、  Thread.sleep(1);B、  Thread.sleep(100);C、  Thread.sleep(1000);D、  try{  Thread.sleep(1);  )  catch  (Exception e)  {  }E、  try{Thread.sleep(100);  )  catch  (Exception  e)  {  }F、  try{Thread.sleep(1000);  ) catch  (Exception  e)  { }

class Work implements Runnable {  Thread other;   Work(Thread other) { this.other = other; }  public void run() {  try { other.join(); } catch (Exception e) { }  System.out.print("after join ");  } }  class Launch {  public static void main(String [] args) {  new Thread(new Work(Thread.currentThread())).start();  System.out.print("after start ");  } }  结果为:()A、after joinB、after startC、after join after startD、after start after join

public class TestSeven extends Thread {  private static int x;  public synchronized void doThings() {  int current = x;  current++;  x = current;  }  public void run() {  doThings();  }  }  Which is true?() A、 Compilation fails.B、 An exception is thrown at runtime.C、 Synchronizing the run() method would make the class thread-safe.D、 The data in variable “x” are protected from concurrent access problems.E、 Declaring the doThings() method as static would make the class thread-safe.F、 Wrapping the statements within doThings() in a synchronized(new Object()) {} block would make the class thread-safe.

class Order implements Runnable {    public void run ()  {  try { Thread.sleep (2000) ;  } catch (Exception e)    System.out.print("in") ;  public static void main (String [] args)  {    Thread t = new Thread (new Order ()) ;    t.start () ;  System.out.print ("pre ") ;  try { t.join () ;  } catch (Exception e)  { }    System.out.print ("post") ;   可产生哪两项结果?()  A、 pre in postB、 pre inC、 in post preD、 in pre postE、 pre post in

Which two code fragments will execute the method doStuff() in a separate thread?()A、new Thread() {public void run() { doStuff(); }};B、new Thread() {public void start() { doStuff(); }};C、new Thread() {public void start() { doStuff(); }}.run();D、new Thread() {public void run() { doStuff(); }}.start();E、new Thread(new Runnable() {public void run() { doStuff(); }}).start();

单选题class MyThread extends Thread {  public void run() { System.out.println(“AAA”); }  public void run(Runnable r) { System.out.println(“BBB”); }  public static void main(String[] args) {  new Thread(new MyThread()).start();  }  }   What is the result?()A AAAB BBBC Compilation fails.D The code runs with no output.

多选题Which two code fragments will execute the method doStuff() in a separate thread?()Anew Thread() { public void run() { doStuff(); } }Bnew Thread() { public void start() { doStuff(); } }Cnew Thread() { public void start() { doStuff(); } } .run();Dnew Thread() { public void run() { doStuff(); } } .start();Enew Thread(new Runnable() { public void run() { doStuff(); } } ).run();Fnew Thread(new Runnable() { public void run() { doStuff(); } }).start();

多选题Which two code fragments will execute the method doStuff() in a separate thread?()Anew Thread() {public void run() { doStuff(); }};Bnew Thread() {public void start() { doStuff(); }};Cnew Thread() {public void start() { doStuff(); }}.run();Dnew Thread() {public void run() { doStuff(); }}.start();Enew Thread(new Runnable() {public void run() { doStuff(); }}).start();

单选题public class A extends Thread {  A() {  setDaemon(true);  }  public void run() {  (new B()).start();  try {  Thread.sleep(60000);  } catch (InterruptedException x) {}  System.out.println(“A done”);  }  class B extends Thread {  public void run() {  try {  Thread.sleep(60000);  } catch (InterruptedException x) {}  System.out.println(“B done”);  }  }  public static void main(String[] args) {  (new A()).start();  }  }   What is the result?()A A doneB B doneC A done B doneD B done A doneE There is no exception that the application will print anything.F The application outputs “A done” and “B done”, in no guaranteed order.

多选题class Order implements Runnable {  public void run() {  try { Thread.sleep(2000); } catch (Exception e) { }  System.out.print("in ");  }  public static void main(String [] args) {  Thread t = new Thread(new Order());  t.start();  System.out.print("pre ");  try { t.join(); } catch (Exception e) { }  System.out.print("post ");  } }  可产生哪两项结果?()Ain preBpre inCin pre postDpre in post