in pre
pre in
in pre post
pre in post
第1题:
现有: 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?()
第2题:
class ThreadExcept implements Runnable { public void run() { throw new RuntimeException("exception "); } public static void main(String [] args) { new Thread(new ThreadExcept()).start(); try { int x = Integer.parseInt(args[0]); Thread.sleep(x); System.out.print("main "); } catch (Exception e) { } } } 和命令行: java ThreadExcept 1000 哪一个是结果?()
第3题:
public class TestOne implements Runnable { public static void main (String[] args) throws Exception { Thread t = new Thread(new TestOne()); t.start(); System.out.print(”Started”); t.join(); System.out.print(”Complete”); } public void run() { for (int i= 0; i< 4; i++) { System.out.print(i); } } } What can be a result?()
第4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?()
第5题:
class ThreadBoth extends Thread implements Runnable { public void run(){ System.out.print("hi "); } public static void main(String [] args){ Thread t1 = new ThreadBoth(); Thread t2 = new Thread(t1); t1.run(); t2.run(); } } 结果为:()
第6题:
现有: class ThreadBoth extends Threaa implements Runnable { public void run() (System.out.print("hi"); } public static voicl main (String [] args) { Thread tl=new ThreadBoth(): Thread t2 = new Thread (tl): tl.run(): t2.run(): } 结果为:()
第7题:
public class Threads4 { public static void main (String[] args) { new Threads4().go(); } public void go() { Runnable r = new Runnable() { public void run() { System.out.print(”foo”); } }; Thread t = new Thread(r); t.start(); t.start(); } } What is the result?()
第8题:
代码输出 1 3 4
代码输出 3 4 1
代码输出 1 2 3 4
代码不会完成
第9题:
Compilation fails.
An exception is thrown at runtime.
The code executes normally and prints „foo”.
The code executes normally, but nothing is printed.
第10题:
代码输出l 3 4
代码输出3 4 1
代码输出l 2 3 4
代码输出1 3 4 2
代码运行完毕
代码不会完成
第11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.
第12题:
main
编译失败
代码运行,但没有输出
main java.lang.RuntimeException: exception
第13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?()
第14题:
现有: class Thread2 implements Runnable { void run() { System.out.print("go "); } public static void main(String [] args) { Thread2 t2 = new Thread2(); Thread t = new Thread(t2); t.start(); } } 结果为:()
第15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16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17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18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19题:
Compilation fails.
An exception is thrown at runtime.
The code executes and prints “running”.
The code executes and prints “runningrunning”.
The code executes and prints “runningrunningrunning”.
第20题:
Compilation fails.
An exception is thrown at runtime.
The code executes and prints “StartedComplete”.
The code executes and prints “StartedComplete0123”.
The code executes and prints “Started0l23Complete”.
第21题:
pre in post
pre in
in post pre
in pre post
pre post in
第22题:
go
运行时异常被抛出
代码运行,无输出结果
编译失败
第23题:
Thread.sleep(1);
Thread.sleep(100);
Thread.sleep(1000);
try { Thread.sleep(100); } catch (Exception e) { }