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?()
第1题:
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)
第2题:
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 Runnable
B.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()
第3题:
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 Runnable
B.extends Thread
C.implements Thread
D.extends Runnable
第4题:
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 Runnable
B.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()
第5题:
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!”);
}
}
第6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?()
第7题:
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 ?()
第8题:
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:()
第9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?()
第10题:
AAA
BBB
Compilation fails.
The code runs with no output.
第11题:
new Thread() {public void run() { doStuff(); }};
new Thread() {public void start() { doStuff(); }};
new Thread() {public void start() { doStuff(); }}.run();
new Thread() {public void run() { doStuff(); }}.start();
new Thread(new Runnable() {public void run() { doStuff(); }}).start();
第12题:
in pre
pre in
in pre post
pre in post
第13题:
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-0
B.Thread-1
C.Thread-0
D.Thread-1 Thread-1 Thread-0
第14题:
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 Thread
B.extends Runnable
C.implements Runnable
D.extends Thread
第15题:
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.start
B.t.class
C.t.thread
D.t.static
第16题:
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 Thread
B.extends Runnable
C.implements Runnable
D.extends Thread
第17题:
( 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;i<5;i++){
system.out.println( " i= " +i);
}
}
}
A ) implements Runnable
B ) extends Thread
C ) implements Thread
D ) extends Runnable
第18题:
Which two code fragments will execute the method doStuff() in a separate thread?()
第19题:
现有: 5. class Order2 implements Runnable { 6. public void run() { 7. for (int x- o; 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?()
第20题:
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?()
第21题:
Which two code fragments will execute the method doStuff() in a separate thread?()
第22题:
new Thread() { public void run() { doStuff(); } }
new Thread() { public void start() { doStuff(); } }
new Thread() { public void start() { doStuff(); } } .run();
new Thread() { public void run() { doStuff(); } } .start();
new Thread(new Runnable() { public void run() { doStuff(); } } ).run();
new Thread(new Runnable() { public void run() { doStuff(); } }).start();
第23题:
A done
B done
A done B done
B done A done
There is no exception that the application will print anything.
The application outputs “A done” and “B done”, in no guaranteed order.