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Declarations and Access Control problems

  • 1. What will be the output of the program? 
    import java.util.*;
public class NewTreeSet2 extends NewTreeSet 
{
    public static void main(String [] args) 
    {
        NewTreeSet2 t = new NewTreeSet2();
        t.count();
    }
}
protected class NewTreeSet
{
    void count() 
    {
        for (int x = 0; x < 7; x++,x++ ) 
        {
            System.out.print(" " + x);
        }
    }
}

  • Options
  • A. 0 2 4
  • B. 0 2 4 6
  • C. Compilation fails at line 2
  • D. Compilation fails at line 10
    • Discuss
  • 2. What will be the output of the program? 
    public class Test 
{  
    public static void main(String args[])
    { 
        class Foo 
        {
            public int i = 3;
        } 
        Object o = (Object)new Foo();
        Foo foo = (Foo)o;
        System.out.println("i = " + foo.i);
    }
}

  • Options
  • A. i = 3
  • B. Compilation fails.
  • C. i = 5
  • D. A ClassCastException will occur.
    • Discuss
  • 3. What will be the output of the program? 
    public class ArrayTest 
{ 
    public static void main(String[ ] args)
    { 
        float f1[ ], f2[ ]; 
        f1 = new float[10]; 
        f2 = f1; 
        System.out.println("f2[0] = " + f2[0]); 
    } 
}

  • Options
  • A. It prints f2[0] = 0.0
  • B. It prints f2[0] = NaN
  • C. An error at f2 = f1; causes compile to fail.
  • D. It prints the garbage value.
    • Discuss
  • 4. What will be the output of the program? 
    public class Test 
{
    public int aMethod()
    {
        static int i = 0;
        i++;
        return i;
    }
    public static void main(String args[])
    {
        Test test = new Test();
        test.aMethod();
        int j = test.aMethod();
        System.out.println(j);
    }
}

  • Options
  • A. 0
  • B. 1
  • C. 2
  • D. Compilation fails.
    • Discuss
  • 5. What will be the output of the program? 
    class Super 
{ 
    public Integer getLength() 
    {
        return new Integer(4); 
    } 
} 

public class Sub extends Super 
{ 
    public Long getLength() 
    {
        return new Long(5); 
    } 

    public static void main(String[] args) 
    { 
        Super sooper = new Super(); 
        Sub sub = new Sub(); 
        System.out.println( 
        sooper.getLength().toString() + "," + sub.getLength().toString() ); 
    } 
}

  • Options
  • A. 4, 4
  • B. 4, 5
  • C. 5, 4
  • D. Compilation fails.
    • Discuss
  • 6. What will be the output of the program? 
    class Super
{ 
    public int i = 0; 

    public Super(String text) /* Line 4 */
    {
        i = 1; 
    } 
} 

class Sub extends Super
{
    public Sub(String text)
    {
        i = 2; 
    } 

    public static void main(String args[])
    {
        Sub sub = new Sub("Hello"); 
        System.out.println(sub.i); 
    } 
}

  • Options
  • A. 0
  • B. 1
  • C. 2
  • D. Compilation fails.
    • Discuss
  • 7. What will be the output of the program? 
    class Base
{ 
    Base()
    {
        System.out.print("Base");
    }
} 
public class Alpha extends Base
{ 
    public static void main(String[] args)
    { 
        new Alpha(); /* Line 12 */
        new Base(); /* Line 13 */
    } 
}

  • Options
  • A. Base
  • B. BaseBase
  • C. Compilation fails
  • D. The code runs with no output
    • Discuss
  • 8. What will be the output of the program? 
    class A 
{
    final public int GetResult(int a, int b) { return 0; } 
} 
class B extends A 
{ 
    public int GetResult(int a, int b) {return 1; } 
} 
public class Test 
{
    public static void main(String args[]) 
    { 
        B b = new B(); 
        System.out.println("x = " + b.GetResult(0, 1));  
    } 
}

  • Options
  • A. x = 0
  • B. x = 1
  • C. Compilation fails.
  • D. An exception is thrown at runtime.
    • Discuss

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