Question 19)
10)When using the GridBagLayout manager, each new component requires a new instance of the GridBagConstraints class. Is this statement
1) true
2) false
Answer to Question 19)
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Question 20)
Which most closely matches a description of a Java Map?
1) A vector of arrays for a 2D geographic representation
2) A class for containing unique array elements
3) A class for containing unique vector elements
4) An interface that ensures that implementing classes cannot contain duplicate keys
Answer to Question 20)
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Question 21)
How does the set collection deal with duplicate elements?
1) An exception is thrown if you attempt to add an element with a duplicate value
2) The add method returns false if you attempt to add an element with a duplicate value
3) A set may contain elements that return duplicate values from a call to the equals method
4) Duplicate values will cause an error at compile time
Answer to Question 21)
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Question 22)
What can cause a thread to stop executing?
1) The program exits via a call to System.exit(0);
2) Another thread is given a higher priority
3) A call to the thread’s stop method.
4) A call to the halt method of the Thread class
Answer to Question 22)
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Question 23)
For a class defined inside a method, what rule governs access to the variables of the enclosing method?
1) The class can access any variable
2) The class can only access static variables
3) The class can only access transient variables
4) The class can only access final variables
Answer to Question 23)
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Question 24)
Under what circumstances might you use the yield method of the Thread class
1) To call from the currently running thread to allow another thread of the same or higher priority to run
2) To call on a waiting thread to allow it to run
3) To allow a thread of higher priority to run
4) To call from the currently running thread with a parameter designating which thread should be allowed to run
Answer to Question 24)
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Question 25)
What will happen when you attempt to compile and run the following code
public class Hope{
public static void main(String argv[]){
Hope h = new Hope();
}
protected Hope(){
for(int i =0; i <10; i ++){
System.out.println(i);
}
}
}
1) Compilation error: Constructors cannot be declared protected
2) Run time error: Constructors cannot be declared protected
3) Compilation and running with output 0 to 10
4) Compilation and running with output 0 to 9
Answer to Question 25)
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Question 26)
What will happen when you attempt to compile and run the following code
public class MySwitch{
public static void main(String argv[]){
MySwitch ms= new MySwitch();
ms.amethod();
}
public void amethod(){
int k=10;
switch(k){
default: //Put the default at the bottom, not here
System.out.println(“This is the default output”);
break;
case 10:
System.out.println(“ten”);
case 20:
System.out.println(“twenty”);
break;
}
}
}
1) None of these options
2) Compile time error target of switch must be an integral type
3) Compile and run with output “This is the default output”
4) Compile and run with output of the single line “ten”
Answer to Question 26)
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