Which of the following are legal statements?
1) float f=1/3;
2) int i=1/3;
3) float f=1.01;
4) double d=999d;
Which of the following are Java keywords?
1) NULL
2) new
3) instanceOf
4) wend
Which of the following are valid statements?
1) System.out.println(1+1);
2) int i=2+'2';
3) c
4) byte b=255;
Which of the following statements are true?
1) The garbage collection algorithm in Java is vendor implemented
2) The
size of primitives is platform dependent
3) The default type for a numerical
literal with decimal component is a float.
4) You can modify the value in an
Instance of the Integer class with the setValue method
Which of the following are true statements?
1) I/O in Java can only be performed using the Listener classes
2) The
RandomAccessFile class allows you to move directly to any point a file.
3)
The creation of a named instance of the File class creates a matching file in
the underlying operating system only when the close method is called.
4) The
characteristics of an instance of the File class such as the directory
separator, depend on the current underlying operating system
Which of the following statements are true?
1) The instanceof operator can be used to determine if a reference is an
instance of a class, but not an interface.
2) The instanceof operator can be
used to determine if a reference is an instance of a particular primitive
wrapper class
3) The instanceof operator will only determine if a reference
is an instance of a class immediately above in the hierarchy but no further up
the inheritance chain
4) The instanceof operator can be used to determine if
one reference is of the same class as another reference thus
Which of the following statements are true?
1) An interface can only contain method and not variables
2) Interfaces
cannot have constructors
3) A class may extend only one other class and
implement only one interface
4) Interfaces are the Java approach to
addressing its lack of multiple inheritance, but require implementing classes to
create the functionality of the Interfaces.
Which of the following are valid statements
1) public class MyCalc extends Math
2) Math.max(s);
3)
Math.round(9.99,1);
4)Math.mod(4,10);
Which of the following are methods of the Runnable interface
1) run
2) start
3) yield
4) stop
Which of the following statements are true?
1) A byte can represent between -128 to 127
2) A byte can represent
between -127 to 128
3) A byte can represent between -256 to 256
4) A
char can represent between -2x2 pow 16 2 x2 pow 16 - 1
What will happen when you attempt to compile and run the following code
class Base{
public void Base(){
System.out.println("Base");
}
}
public class In extends Base{
public static
void main(String argv[]){
In i=new In();
}
}
1) Compile time error Base is a keyword
2) Compilation and no output at
runtime
3) Output of Base
4) Runtime error Base has no valid constructor
You have a public class called myclass with the main method defined as follows
public static void main(String parm[]){
System.out.println(parm[0]);
}
If you attempt to compile the class and run the program as follows
java myclass hello
What will happen?
1) Compile time error, main is not correctly defined
2) Run time error,
main is not correctly defined
3) Compilation and output of java
4)
Compilation and output of hello
Which of the following statements are true?
1) If a class has any abstract methods it must be declared abstract itself.
2) All methods in an abstract class must be declared as abstract
3) When
applied to a class, the final modifier means it cannot be sub-classed
4) transient and volatile are Java modifiers
Objective 1.2)
Which of the following are valid methods?
1) public static native void amethod(){}
2) public static void
amethod(){}
3) private protected void amethod(){}
4) static native void
amethod();
Objective 6.2)
Which of the following statements are true?
1) Constructors cannot have a visibility modifier
2) Constructors can be
marked public and protected, but not private
3) Constructors can only have a
primitive return type
4) Constructors are not inherited
What will happen when you attempt to compile and run the following class?
class Base{
Base(int i){
System.out.println("Base");
}
}
class Severn extends Base{
public static void main(String argv[]){
Severn s = new Severn();
}
void Severn(){
System.out.println("Severn");
}
}
1) Compilation and output of the string "Severn" at runtime
2) Compile
time error
3) Compilation and no output at runtime
4) Compilation and
output of the string "Base"
Which of the following statements are true?
1) static methods do not have access to the implicit variable called
this
2) A static method may be called without creating an instance of
its class
3) A static method may not be overriden to be non-static
4) A
static method may not be overloaded
Which of the following will compile without error?
1)
char c='1';
System.out.println(c>>1);
2)
Integer i=Integer("1");
System.out.println(i>>1);
3)
int i=1;
System.out.println(i<<<1);
4)
int i=1;
System.out.println(i<<1);
Which of the following are true?
1) A component may have only one event listener attached at a time
2) An
event listener may be removed from a component
3) The ActionListener
interface has no corresponding Adapter class
4) The processing of an event
listener requires a try/catch block
Which of the following are Java keywords?
1) sizeof
2) main
3) transient
4) volatile