Thread.sleep(1);
Thread.sleep(100);
Thread.sleep(1000);
try{ Thread.sleep(1); ) catch (Exception e) { }
try{Thread.sleep(100); ) catch (Exception e) { }
try{Thread.sleep(1000); ) catch (Exception e) { }
第1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2题:
public class X { public static void main(String [] args) { try { badMethod(); System.out.print(“A”); } catch (Exception ex) { System.out.print(“B”); } finally { System.out.print(“C”); } System.out.print(“D”); } public static void badMethod() {} } What is the result?()
第3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4题:
2. public class Foo implements Runnable ( 3. public void run (Thread t) { 4. system.out.printIn(“Running.”); 5. } 6. public static void main (String[] args) { 7. new thread (new Foo()).start(); 8. ) 9. ) What is the result?()
第5题:
1. class A implements runable ( 2. int i; 3. public void run () ( 4. try ( 5. thread.sleep(5000); 6. i= 10; 7. ) catch(InterruptedException e) {} 8. ) 9. ) 10. 11. public class Test { 12. public static void main (string args) ( 13. try ( 14. A a = new A (); 15. Thread t = new Thread (a); 16. t.start(); 17. 18. int j= a.i; 19. 20. ) catch (Exception e) {} 21. ) 22. ) Which statement al line 17 will ensure that j=10 at line 19?()
第6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7题:
现有 1. class Calc { 2. public static void main(String [] args) { 3. try { 4. int x = Integer.parselnt ("42a") ; 5. //insert code here 6. System.out.print ("oops"); 7. } 8. } 9. } 下面哪两行分别插入到第五行,会导致输 "oops" ? ()
第8题:
The program runs and prints “0”
The program runs and prints “1”
The program runs but aborts with an exception.
An error “possible undefined variable” at line 4 causes compilation to fail.
An error “possible undefined variable” at line 9 causes compilation to fail.
第9题:
main
编译失败
代码运行,但没有输出
main java.lang.RuntimeException:exception
第10题:
a.wait();
t.wait();
t.join();
t.yield();
t.notify();
a.notify();
t.interrupt();
第11题:
in pre
pre in
in pre post
pre in post
第12题:
Thread.sleep(1);
Thread.sleep(100);
Thread.sleep(1000);
try { Thread.sleep(100); } catch (Exception e) { }
第13题:
1. public class Test { 2. public static String output =””; 3. 4. public static void foo(int i) { 5. try { 6. if(i==1) { 7. throw new Exception(); 8. } 9. output += “1”; 10. } 11. catch(Exception e) { 12. output += “2”; 13. return; 14. } 15. finally { 16. output += “3”;17. } 18. output += “4”; 19. } 20. 21. public static void main(String args[]) { 22. foo(0); 23. foo(1); 24. 25. }26. } What is the value of the variable output at line 23?()
第14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15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16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17题:
现有: 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18题:
1. class Exc0 extends Exception { } 2. class Exc1 extends Exc0 { } 3. public class Test { 4. public static void main(String args[]) { 5. try { 6. throw new Exc1(); 7. } catch (Exc0 e0) { 8. System.out.println(“Ex0 caught”); 9. } catch (Exception e) { 10. System.out.println(“exception caught”); 11. } 12. } 13. } What is the result?()
第19题:
after join
after start
after join after start
after start after join
第20题:
main
编译失败
main java.lang.RuntimeException: exception
代码运行,但没有输出
第21题:
An exception is thrown.
The program exists without printing anything.
An error at line 1 causes compilation to fail.
An error at line 6 causes the compilation to fail.
“Running” is printed and the program exits.
第22题:
Thread.sleep(1);
Thread.sleep(100);
Thread.sleep(1000);
try{ Thread.sleep(1); ) catch (Exception e) { }
try{Thread.sleep(100); ) catch (Exception e) { }
try{Thread.sleep(1000); ) catch (Exception e) { }
第23题:
a.wait();
t.wait();
t.join();
t.yield();
t.notify();
a.notify();
t.interrupt();
第24题:
main
编译失败
代码运行,但没有输出
main java.lang.RuntimeException: exception