Question 31)
What will happen when you attempt to compile and run the following code?

public class Holt extends Thread{
        private String sThreadName; 
        public static void main(String argv[]){
                Holt h = new Holt();
                h.go(); 
        }
Holt(){}

Holt(String s){
        sThreadName = s;
}
public String getThreadName(){
        return sThreadName;
}

public void go(){
        Holt first = new Holt("first");
        first.start();
        Holt second = new Holt("second");
        second.start();
}

        public void start(){
                for(int i = 0; i < 2; i ++){
                        System.out.println(getThreadName() +i);
                try{
                        Thread.sleep(100);
                        } 
catch(InterruptedException e){System.out.println(e.getMessage());}
                }
        }
}

1) Compile time error
2) Output of first0, second0, first0, second1
3) Output of first0, first1, second0, second1
4) Runtime error

Question 32)

An Applet has its Layout Manager set to the default of FlowLayout. What code would be correct to change to another Layout Manager.

1) setLayoutManager(new GridLayout());
2) setLayout(new GridLayout(2,2));
3) setGridLayout(2,2);
4) setBorderLayout();

Question 33)
What will happen when you attempt to compile and run the following code?.

class Background implements Runnable{
 int i=0;
  public int run(){
    while(true){
     i++;
     System.out.println("i="+i);
     } //End while
       return 1;
  }//End run

}//End class

1) It will compile and the run method will print out the increasing value of i.
2) It will compile and calling start will print out the increasing value of i.
3) The code will cause an error at compile time.
4) Compilation will cause an error because while cannot take a parameter of true.

Question 34)

Which of the following statements about this code are true?

public class Morecombe{
public static void main(String argv[]){
  Morecombe m = new Morecombe();
 m.go(new Turing(){}); 
}
public void go(Turing t){
 t.start();
 }

}
class Turing extends Thread{
 public void run(){
  for(int i =0; i < 2; i++){
   System.out.println(i);
  } 
 } 

}

1) Compilation error due to malformed parameter to go method
2) Compilation error, class Turing has no start method
3) Compilation and output of 0 followed by 1
4) Compilation but runtime error

Question 35)
What will be the result when you attempt to compile and run the following code?.

public class Conv{
    public static void main(String argv[]){
 Conv c=new Conv();
 String s=new String("ello");
 c.amethod(s);
    }

    public void amethod(String s){
 char c='H';
 c+=s;
 System.out.println(c);
    }
}

1) Compilation and output the string "Hello"
2) Compilation and output the string "ello"
3) Compilation and output the string elloH
4) Compile time error

Question 36)

Given the following code, what test would you need to put in place of the comment line?

//place test here

to result in an output of the string Equal

public class EqTest{
  public static void main(String argv[]){
   EqTest e=new EqTest();
  }

 EqTest(){
   String s="Java";
   String s2="java";
   //place test here {
    System.out.println("Equal");
    }else
    {
    System.out.println("Not equal");
   }
  }
}

1) if(s==s2)
2) if(s.equals(s2)
3) if(s.equalsIgnoreCase(s2))
4) if(s.noCaseMatch(s2))

Question 37)

Given the following code

import java.awt.*;
public class SetF extends Frame{
public static void main(String argv[]){
 SetF s=new SetF();
 s.setSize(300,200);
 s.setVisible(true);
 }

}

How could you set the frame surface color to pink

1)s.setBackground(Color.pink);
2)s.setColor(PINK);
3)s.Background(pink);
4)s.color=Color.pink

Question 38)
How can you change the current working directory using an instance of the File class called FileName?
1) FileName.chdir("DirName")
2) FileName.cd("DirName")
3) FileName.cwd("DirName")
4) The File class does not support directly changing the current directory.

Question 39)

If you create a TextField  with a constructor to set it to occupy 5 columns, what difference will it make if you use it with a proportional font (ie Times Roman) or a fixed pitch typewriter style font (Courier).

1)With a fixed font you will see 5 characters, with a  proportional it will depend on the width of the characters
2)With a fixed font you will see 5 characters,with a  proportional it will cause the field to expand to fit the text 3)The columns setting does not affect the number of characters displayed
4)Both will show exactly 5 characters

Question 40)
Given the following code how could you invoke the Base constructor that will print out the string "base constructor";

class Base{
    Base(int i){
 System.out.println("base constructor");
    }
    Base(){
    }
}

public class Sup extends Base{
    public static void main(String argv[]){
 Sup s= new Sup();
 //One
    }
    Sup()
    {
 //Two
    }

    public void derived()
    {
 //Three
    }
}

1) On the line After //One put Base(10);
2) On the line After //One put super(10);
3) On the line After //Two put super(10);
4) On the line After //Three put super(10);

Question 41)

Given the following code what will be output?

public class Pass{
    static int j=20;
    public static void main(String argv[]){
 int i=10;
 Pass p = new Pass();
 p.amethod(i);
 System.out.println(i);
 System.out.println(j);
    }

    public void amethod(int x){
 x=x*2;
 j=j*2;
    }
}

1) Error: amethod parameter does not match variable
2) 20 and 40
3) 10 and 40
4) 10, and 20

Question 42)
What code placed after the comment //For loop would result in the population of every element of the array ia[] with a value from variable i.?

public class Lin{
    public static void main(String argv[]){
 Lin l = new Lin();
 l.amethod();
    }
    public void amethod(){
 int ia[] = new int[4];
 //Start For loop
 {
     ia[i]=i;
     System.out.println(ia[i]);
 }
    }
}

1) for(int i=0; i < ia.length() -1; i++)
2) for (int i=0; i< ia.length(); i++)
3) for(int i=1; i < 4; i++)
4) for(int i=0; i< ia.length;i++)

Question 43)
What will be the result when you try to compile and run the following code?

private class Base{
    Base(){
 int i = 100;
 System.out.println(i);
    }
}

public class Pri extends Base{
    static int i = 200;
    public static void main(String argv[]){
 Pri p = new Pri();
 System.out.println(i);
    }
}

1) Error at compile time
2) 200
3) 100 followed by 200
4) 100

Question 44)

What will the following code print out?

public class Oct{
    public static void main(String argv[]){
 Oct o = new Oct();
 o.amethod();
    }
    public void amethod(){
 int oi= 012;
 System.out.println(oi);
    }
}

1)12
2)012
3)10
4)10.0 

Question 45

What will happen when you try compiling and running this code?

public class Ref{
    public static void main(String argv[]){
 Ref r = new Ref();
 r.amethod(r);
    }
    public void amethod(Ref r){
 int i=99;
 multi(r);
 System.out.println(i);
    }
    public void multi(Ref r){
 r.i = r.i*2;
    }
}

1) Error at compile time
2) An output of 99
3) An output of 198
4) An error at runtime

Question 46)

You need to create a class that will store unique object elements. You do not need to sort these elements but they must be unique.

What interface might be most suitable to meet this need?

1)Set
2)List
3)Map
4)Vector 

Question 47)

Which of the following will successfully create an instance of the Vector class and add an element?

1) Vector v=new Vector(99);
     v[1]=99;
 

2) Vector v=new Vector();
     v.addElement(99);
 

3) Vector v=new Vector();
    v.add(99);
 

4 Vector v=new Vector(100);
   v.addElement("99");

Question 48)

You have created a simple Frame and overridden the paint method as follows

public void paint(Graphics g){
g.drawString("Dolly",50,10);

}
What will be the result when you attempt to compile and run the program? 

1) The string "Dolly" will be displayed at the centre of the frame
2) An error at compilation complaining at the signature of the paint method
3) The lower part of the word Dolly will be seen at the top of the frame, with the top hidden.
4) The string "Dolly" will be shown at the bottom of the frame.

Question 49)

What will be the result when you attempt to compile this program?

public class Rand{
    public static void main(String argv[]){
 int iRand;
 iRand = Math.random();
 System.out.println(iRand);
    }
}

1) Compile time error referring to a cast problem
2) A random number between 1 and 10
3) A random number between 0 and 1
4) A compile time error about random being an unrecognised method

Question 50)

Given the following code

import java.io.*;
public class Th{
    public static void main(String argv[]){
 Th t = new Th();
 t.amethod();
    }
    public void amethod(){
 try{
     ioCall();
 }catch(IOException ioe){}
    }
}

What code would be most likely for the body of the ioCall method

1) public void ioCall ()throws IOException{
 DataInputStream din = new DataInputStream(System.in);
 din.readChar();
 }
2) public void ioCall ()throw IOException{
 DataInputStream din = new DataInputStream(System.in);
 din.readChar();
 }
3) public void ioCall (){
 DataInputStream din = new DataInputStream(System.in);
 din.readChar();
 }
4) public void ioCall throws IOException(){
 DataInputStream din = new DataInputStream(System.in);
 din.readChar();

 } 
 

        

Question 51)

What will happen when you compile and run the following code?

public class Scope{
    private int i;
    public static void main(String argv[]){
 Scope s = new Scope();
 s.amethod();
    }//End of main
    public static void amethod(){
 System.out.println(i);
    }//end of amethod
}//End of class

1) A value of 0 will be printed out
2) Nothing will be printed out
3) A compile time error
4) A compile time error complaining of the scope of the variable i

Question 52)
You want to lay out a set of buttons horizontally but with more space between the first button and the rest. You are going to use the GridBagLayout manager to control the way the buttons are set out. How will you modify the way the GridBagLayout acts in order to change the spacing around the first button?
 

1) Create an instance of the GridBagConstraints class, call the weightx() method and then pass the GridBagConstraints instance with the component to the setConstraints method of the GridBagLayout class.
2) Create an instance of the GridBagConstraints class, set the weightx field and then pass the GridBagConstraints instance with the component to the setConstraints method of the GridBagLayout class.
3) Create an instance of the GridBagLayout class, set the weightx field and then call the setConstraints method of the GridBagLayoutClass with the component as a parameter.
4) Create an instance of the GridBagLayout class, call the setWeightx() method and then pass the GridBagConstraints instance with the component to the setConstraints method of the GridBagLayout class.

Question 53)
Which of the following can you perform using the File class?

1) Change the current directory
2) Return the name of the parent directory
3) Delete a file
4) Find if a file contains text or binary information

Question 54)

Which statement is true of the following code?

public class Rpcraven{
 public static void main(String argv[]){
 Pmcraven pm1 = new Pmcraven("One");
 pm1.run();
 Pmcraven pm2 = new Pmcraven("Two");
 pm2.run();

 }
}

class Pmcraven extends Thread{
private String sTname="";
Pmcraven(String s){
 sTname = s;

}
public void run(){
 for(int i =0; i < 2 ; i++){
  try{
   sleep(1000);
  }catch(InterruptedException e){}

  yield();
  System.out.println(sTname);
  }

 }
}

1) Compile time error, class Rpcraven does not import java.lang.Thread
2) Output of One One Two Two
3) Output of One Two One Two
4) Compilation but no output at runtime

Question 55)

You are concerned that your program may attempt to use more memory than is available. To avoid this situation you want to ensure that the Java Virtual Machine will run its garbage collection just before you start a complex routine. What can you do to be certain that garbage collection will run when you want .

1) You cannot be certain when garbage collection will run
2) Use the Runtime.gc() method to force garbage collection
3) Ensure that all the variables you require to be garbage collected are set to null
4) Use the System.gc() method to force garbage collection

Question 56)

You are using the GridBagLayout manager to place a series of buttons on a Frame. You want to make the size of one of the buttons bigger than the text it contains. Which of the following will allow you to do that?

1) The GridBagLayout manager does not allow you to do this
2) The setFill method of the GridBagLayout class
3) The setFill method of the GridBagConstraints class
4) The fill field of the GridBagConstraints class 

Question 57)

Which of the following most closely describes a bitset collection?

1) A class that contains groups of unique sequences of bits
2) A method for flipping individual bits in instance of a primitive type
3) An array of boolean primitives that indicate zeros or ones
4) A collection for storing bits as on-off information, like a vector of bits

Question 58)
You have these files in the same directory. What will happen when you attempt to compile and run Class1.java if you have not already compiled Base.java

//Base.java
package Base;
class Base{
    protected void amethod(){
 System.out.println("amethod");
    }//End of amethod
}//End of class base
package Class1;
//Class1.java
public class Class1 extends Base{
    public static void main(String argv[]){
 Base b = new Base();
 b.amethod();
    }//End of main

}//End of Class1

1) Compile Error: Methods in Base not found
2) Compile Error: Unable to access protected method in base class
3) Compilation followed by the output "amethod"
4)Compile error: Superclass Class1.Base of class Class1.Class1 not found

Question 59)

What will happen when you attempt to compile and run the following code

class Base{
    private void amethod(int iBase){
 System.out.println("Base.amethod");
    }
}



class Over extends Base{
    public static void main(String argv[]){
 Over o = new Over();
 int iBase=0;
 o.amethod(iBase);
    }

    public void amethod(int iOver){
 System.out.println("Over.amethod");
    }
}

1) Compile time error complaining that Base.amethod is private
2) Runtime error complaining that Base.amethod is private
3) Output of "Base.amethod"
4) Output of "Over.amethod" 

Question 60)

You are creating an applet with a Frame that contains buttons. You are using the GridBagLayout manager and you have added Four buttons. At the moment the buttons appear in the centre of the frame from left to right. You want them to appear one on top of the other going down the screen. What is the most appropriate way to do this.
 

1) Set the gridy value of the GridBagConstraints class to a value increasing from 1 to 4
2) set the fill value of the GridBagConstraints class to VERTICAL
3) Set the ipady value of the GridBagConstraints class to a value increasing from 0 to 4
4) Set the fill value of the GridBagLayouts class to GridBag.VERTICAL