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 

Answer to Question 35 


--------------------------------------------------------------------------------

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 

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)) 

Answer to Question 36 


--------------------------------------------------------------------------------

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 

Answer to Question 37 


--------------------------------------------------------------------------------

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. 

Answer to Question 38 


--------------------------------------------------------------------------------

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 

Answer to Question 39 


--------------------------------------------------------------------------------

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); 

Answer to Question 40 


--------------------------------------------------------------------------------

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 

Answer to Question 41 


--------------------------------------------------------------------------------

Question 42)

What code placed after the comment //For loop would populate the elements of the array ia[] with values of the 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++) 

Answer to Question 42 


--------------------------------------------------------------------------------

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 

Answer to Question 43 


--------------------------------------------------------------------------------

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 


Answer to Question 44 


--------------------------------------------------------------------------------

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 

Answer to Question 45 


--------------------------------------------------------------------------------

Question 46)
You need to create a class that will store a 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 


Answer to Question 46 


--------------------------------------------------------------------------------

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"); 

Answer to Question 47 


--------------------------------------------------------------------------------

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. 

Answer to Question 48 


--------------------------------------------------------------------------------

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 

Answer to Question 49 


--------------------------------------------------------------------------------

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();

}
Answer to Question 50 


--------------------------------------------------------------------------------

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 

Answer to Question 51 


--------------------------------------------------------------------------------

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. 

Answer to Question 52 


--------------------------------------------------------------------------------

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 

Answer to Question 53 

上一页234567下一页