MileStone 1 Quiz Set 2

Which of the following is correct?

128 >> 1 gives

• 32

• 64

• -64

• -32

Both class Error and class Exception are children of this parent:

• Throwable

• Catchable

• Runnable

• Problem

Here is an abstract method defined in the parent:

public abstract int sumUp(int[] arr);

Which of the following is required in a non-abstract child?

• public abstract int sumUp(int[] arr){…}

• public int sumUp( int[] arr){….}

• public double sumUp ( int [] arr){….}

• public int sumUp( long[] arr){…..}

Given the code below:

interface MyInterface{

void doSomething();

}

class MyClass implements MyInterface {

//xx

}

Choose the valid option that can be substituted in place of xx in the MyClass class

• public void doSomething();

• void doSomething() {/* valid code fragments */}

• private void doSomething () {/*valid code fragments */}

• protected void doSomething() {/*valid code fragments */}

Given A.java contains

class A {public static void main(String[] args){} //1

 

and B.java contains

class B {protected static void main(String[] args){} //2

What is the result od attempting to compile each of the two class declarations and invoke each main method from the command line

• compile-time error at line 1

• compile-time error at line 2

• An attempt to run A from the command line fails

• An attempt to run B from the command line fails

public class TestLiterals{

 public static void main(String[] args){

float f1 = 2.0;

float f2 = 4.0f;

float result = f1 * f2;

System.out.println(result);

}

}

What is the output?

• A value which is exactly 8.0

• Compilation error at line 3

• Compilation error at Line 4

• Compilation error at Line 5

Given the following,

class Dogs{

public String toString(){

return “theDogs”;

}

}

public class TestDogs{

public static void main(String[] args){

Dogs [][] dogs = new Dogs[3][];

System.out,println(dogs[2][0].toString());

}

}

What is the result?

• null

• theDogs

• Compilation fails

• NullPointerException is thrown at runtime

Identify the correct signature of the main method of a java application

 

• public void main(String[] args)

• public static void main(String args)

• public static int main(String args[])

• public static void main(String[] args)

When is a finally{} block executed?

• Only when an unhandled exception is thrown in a try {} block

• Only when any exception is thrown in a try{} block

• Always after execution has left a try catch{} block, no matter for what reason

• Always just as a method is about to finish

Which of the following lists exception types from MOST specific to LEAST specific?

• Error, Exception

• Exception, RuntimeException

• Throwable, RuntimeException

• ArithmeticException, RuntimeException