JAVA认证

7. Give incompleted method:

1)

2) { if(unsafe()){//do something…}

3) else if(safe()){//do the other…}

4) }

The method unsafe() well throe an IOException, which completes the method of declaration when added at line one?

A. public IOException methodName()

B. public void methodName()

C. public void methodName() throw IOException

D. public void methodName() throws IOException

E. public void methodName() throws Exception

8. Give the code fragment:

if(x>4){

System.out.println(“Test 1”);}

else if (x>9){

System.out.println(“Test 2”);}

else {

System.out.println(“Test 3”);}

Which range of value x would produce of output “Test 2”?

A. x<4

B. x>4

C. x>9

D. None

9. Give the following method:

public void example(){

try{

unsafe();

System.out.println(“Test1”);

}catch(SafeException e){System.out.println(“Test 2”);

}finally{System.out.println(“Test 3”);}

System.out.println(“Test 4”);

Which will display if method unsafe () run normally?

A. Test 1

B. Test 2

C. Test 3

D. Test 4

10. Which method you define as the starting point of new thread in a class from which new the thread can be excution?

A. public void start()

B. public void run()

C. public void int()

D. public static void main(String args[])

E. public void runnable()

11.Given the following class definition:

class A{

protected int i;

A(int i){

this.i=i;

}

}

which of the following would be a valid inner class for this class?

Select all valid answers:

A. class B{

}

B. class B extends A{

}

C. class B extends A{

B(){System.out.println(“i=”+i);}

}

D. class B{

class A{}

}

E. class A{}

12. Which modifier should be applied to a method for the lock of object this to be obtained prior to excution any of the method body?

A. synchronized

B. abstract

C. final

D. static

E. public

13. The following code is entire contents of a file called Example.java,causes precisely one error during compilation:

1) class SubClass extends BaseClass{

2) }

3) class BaseClass(){

4) String str;

5) public BaseClass(){

6) System.out.println(“ok”);}

7) public BaseClass(String s){

8) str=s;}}

9) public class Example{

10) public void method(){

11) SubClass s=new SubClass(“hello”);

12) BaseClass b=new BaseClass(“world”);

13) }

14) }

Which line would be cause the error?

A. 9 B. 10 C. 11 D.12

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