Which of the following are valid declarations inside an interface?

Select 2 options

A. void compute();
B. public void compute();
C. public final void compute();
D. static void compute();
E. protected void compute();

Note: Option 4 of this question may be considered too advanced for this exam.

Which lines of code will not be acceptable to the compiler?
import java.*; //1 
public abstract class InternalLogic //2 {  
 float density = 20.0; //3   
public class Doer //4   {      
void do() //5      {         //lot of valid code.      
}   
} }

Select 2 options

A. 1 
B. 2 
C. 3 
D. 4 
E. 5

Consider the following class and interface definitions (in separate files):

public class Sample implements IInt{
public static void main(String[] args){
Sample s = new Sample(); //1
int j = s.thevalue; //2
int k = IInt.thevalue; //3
int l = thevalue; //4
}
}public interface IInt{
int thevalue = 0;
}

What will happen when the above code is compiled and run?

Select 1 option

A. It will give an error at compile time at line //1.
B. It will give an error at compile time at line //2.
C. It will give an error at compile time at line //3
D. It will give an error at compile time at line //4.
E. It will compile and run without any problem.

Which of the following statements are correct?

Select 3 options

A. An abstract class can be extended by an abstract or a concrete class.
B. A concrete class can be extended by an abstract or a concrete class.
C. An interface can be extended by another interface.
D. An interface can be extended by an abstract class.
E. An interface can be extended by a concrete class.
F. An abstract class cannot implement an interface.

An abstract method cannot be overridden.

Select 1 option

A. True
B. False