Is the Java code written correctly?

package pack1;

class A
{

}

package pack2;

class B extends A
{

}

Which of these is a mechanism for naming and visibility control of a class and its members?

The type of variable ‘y’ and ‘v’ in the declaration below is?

int x[], y;

int []u, v;

Predict the output of the following Java code.

import java.util.*;

class Abekus {

public static void main(String args[]) {

Formatter F = new Formatter();

F.format("%X", 230);

System.out.println(F);

}

}

Which of the following statements about packages is incorrect?

Predict the output of the following Java code:

class Abekus {

public static void main(String args[])

{

String abe1 = "I am intern at Abekus";

String abe2 = new String(abe1);

System.out.println((abe1 == abe2) + " " + abe1.equals(abe2));

}

}

public void test(int x)
{
   int odd = 1;
   if(odd) /* Line 4 */
   {
       System.out.println("odd");
   }
   else
   {
       System.out.println("even");
   }
}


Which statement is true?

class check 

    {

        int side,result;

        void Area(int side) 

        {

              result = side*side;

        }

    }    

   public class output{

        public static void main(String args[]) 

        {

            check obj = new check();

            obj.Area(263);

            System.out.println(obj.result);        

        } 

    }

Predict the output of the following Java code:

class Abekus {
public static void main(String args[])
{
String str = "Java Programming";
String str1 = "Java";
if (str.startsWith("J"))
System.out.println("Start Same");
if (str.endsWith("T"))
System.out.println("End Same");
}
}

What is the output of the following program?

public class Test implements Runnable

{

  public void run()

  {

    System.out.printf(" Thread's running ");

  }

  try

  {

    public Test()

    {

      Thread.sleep(5000);

    }  

  } 

  catch (InterruptedException e) 

  {

    e.printStackTrace();

  }

  public static void main(String[] args)

  {

    Test obj = new Test();

    Thread thread = new Thread(obj);

    thread.start();

    System.out.printf(" Abekus");

  }

}