You are creating an application that has a form with a text entry field used to enter a persons age. Which of the following is appropriate for capturing this information.
1) Use the Text field of a TextField and parse the result using
Integer
2) Use the getInteger method of the TextField
3) Use the getText
method of a TextBox and parse the result using the getInt method of Integer
class
4) Use the getText method of a TextField and use the parseInt method of
the Integer class
Given the following declaration
Integer i=new Integer(99);
How can you now set the value of i to 10?
1) i=10;
2) i.setValue(10);
3) i.parseInt(10);
4) none of the
above
Which of the following statements are true
1) constructors cannot be overloaded
2) constructors cannot be
overridden
3) a constructor can return a primitive or an object
reference
4) constructor code executes from the current class up the
hierarchy to the ancestor class
Given a reference called
t
to to a class which extends Thread, which of the following will cause it to give up cycles to allow another thread to execute.
1) t.yield();
2) yield()
3) yield(100) //Or some other suitable amount
in milliseconds
4) yield(t);
What will happen when you attempt to compile and run the following
code?
public class Sandys{
private int court;
public static void main(String argv[]){
Sandys s = new Sandys(99);
System.out.println(s.court);
}
Sandys(int ballcount){
court=ballcount;
}
}
1) Compile time error, the variable court is defined as private
2)
Compile time error, s is not initialized when the System.out method is
called
3) Compilation and execution with no output
4) Compilation and run
with an output of 99
Question 46)
Which of the following statements are true?
1) A method cannot be overloaded to be less public in a child class
2) To
be overridden a method must have the same name and parameter types
3) To be
overridden a method must have the same name, parameter and return types
4) An
overridden method must have the same name, parameter names and parameter types
What will happen when you attempt to compile and run the following code?
class Base{
Base(){
System.out.println("Base");
}
}
public class Checket extends Base{
public static void main(String argv[]){
Checket c = new Checket();
super();
}
Checket(){
System.out.println("Checket");
}
}
1) Compile time error
2) Checket followed by Base
3) Base followed by
Checket
4) runtime error
Which of the following statements are true?
1) Static methods cannot be overriden to be non static
2) Static methods
cannot be declared as private
3) Private methods cannot be overloaded
4)
An overloaded method cannot throw exceptions not checked in the base class
Which of the following statements are true?
1) The automatic garbage collection of the JVM prevents programs from ever
running out of memory
2) A program can suggest that garbage collection be
performed but not force it
3) Garbage collection is platform
independent
4) An object becomes eligible for garbage collection when all
references denoting it are set to null.
Given the following code
public class Sytch{
int x=2000;
public static void main(String argv[]){
System.out.println("Ms "+argv[1]+"Please pay $"+x);
}
}
What will happen if you attempt to compile and run this code with the command line
java Sytch Jones Diggle
1) Compilation and output of Ms Diggle Please pay $2000
2) Compile time
error
3) Compilation and output of Ms Jones Please pay $2000
4)
Compilation but runtime error
What will happen when you attempt to compile and run the following code
class Base{
protected int i = 99;
}
public class Ab{
private int i=1;
public static void main(String argv[]){
Ab a = new Ab();
a.hallow();
}
abstract void hallow(){
System.out.println("Claines "+i);
}
}
1) Compile time error
2) Compilation and output of Claines 99
3)
Compilation and output of Claines 1
4) Compilation and not output at
runtime
You have been asked to create a scheduling system for a hotel and catering organsiation.
You have been given the following information and asked to create a set of classes to represent it.
On the catering side of the organsiation they have
Head Chefs
Chefs
Apprentice Chefs
The system needs to store an employeeid, salary and the holiday entitlement
How would you best represent this information in Java
1) Create classes for Head Chef, Chef, Apprentice Chef and store the other
values in fields
2) Create an employee class and derive sub classes for Head
Chef, Chef, Apprentice Chef and store the other values in fields.
3) Create
and employee class with fields for Job title and fields for the other values.
4) Create classes for all of the items mentioned and create a container
class to represent employees
You need to read in the lines of a large text file containing tens of megabytes of data. Which of the following would be most suitable for reading in such a file
1) new FileInputStream("file.name")
2) new InputStreamReader(new
FileInputStream("file.name"))
3) new BufferedReader(new
InputStreamReader(new FileInputStream("file.name")));
4) new RandomAccessFile
raf=new RandomAccessFile("myfile.txt","+rw");
What will happen when you attempt to compile and run the following code?
public class Inc{
public static void main(String argv[]){
Inc inc = new Inc();
int i =0;
inc.fermin(i);
i = i++;
System.out.println(i);
}
void fermin(int i){
i++;
}
}
1) Compile time error
2) Output of 2
3) Output of 1
4) Output of
0
What will happen when you attempt to compile and run the following code?
public class Agg{ static public long i=10; public static void main(String argv[]){ switch(i){ default: System.out.println("no value given"); case 1: System.out.println("one"); case 10: System.out.println("ten"); case 5: System.out.println("five"); } } }
1) Compile time error
2) Output of "ten" followed by "five"
3) Output
of "ten"
4) Compilation and run time error because of location of default
Given the following class
public class ZeroPrint{
public static void main(String argv[]){
int i =0;
//Here
}
}
Which of the following lines if placed after the comment //Here will print
out 0.
1) System.out.println(i++);
2) System.out.println(i+'0');
3)
System.out.println(i);
4) System.out.println(i--);
Given the following code
class Base {}
class Agg extends Base{
public String getFields(){
String name = "Agg";
return name;
}
}
public class Avf{
public static void main(String argv[]){
Base a = new Agg();
//Here
}
}
What code placed after the comment //Here will result in calling the getFields method resulting in the output of the string "Agg"?
1) System.out.println(a.getFields());
2) System.out.println(a.name);
3)
System.out.println((Base) a.getFields());
4) System.out.println( ((Agg)
a).getFields());
What will happen when you attempt to compile and run the following code.
public class Pvf{
static boolean Paddy;
public static void main(String argv[]){
System.out.println(Paddy);
}
}
1) Compile time error
2) compilation and output of false
3) compilation
and output of true
4) compilation and output of null
Which of the following statements are true?
1) The x,y coordinates of an instance of MouseEvent can be obtained using the
getX() and getY() methods
2) The x,y coordinates of an instance of MouseEvent
can be obtained using the X and Y integer fields
3) The time of a MouseEvent
can be extracted using the getTime() method
4) The time of a MouseEvent can
be extracted using the when parameter of the MouseEvent constructor
Given the following code
import java.io.*;
public class Ppvg{
public static void main(String argv[]){
Ppvg p = new Ppvg();
p.fliton();
}
public int fliton(){
try{
DataInputStream din = new DataInputStream(System.in);
din.readChar();
}catch(IOException ioe){
System.out.println("flytwick");
return 99;
}finally{
System.out.println("fliton");
}
return -1;
}
}
Which of the following statements are true if you try to compile and run the program?
1) The program will run and output only "flytwick"
2) The program will run
and output only "fliton"
3) The program will run and output both "fliton" and
"flytwick"
4) An error will occur at compile time because the method fliton
attempts to return two values