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JAVA题库:格林模拟试题三（下） |
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www.nanhushi.com 佚名 不详 |
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Question 31)
Which of the following statements are true?
1) The default layout manager for an Applet is FlowLayout
2) The default layout manager for a Frame is FlowLayout
3) A layout manager must be assigned to an Applet before the setSize method is called
4) The FlowLayout manager attempts to honor the preferred size of any components
Question 32)
Which of the following statements are true about a variable created with the static modifier?
1) Once assigned the value of a static variable may not be altered
2) A static variable created in a method will keep the same value between calls
3) Only one instance of a static variable will exist for any amount of class instances
4) The static modifier can only be applied to a primitive value
Question 33)
Which of the following statements are true?
1) Java uses a system called UTF for I/O to support international character sets
2) The RandomAccessFile is the most suitable class for supporting international character sets
3) An instance of FileInputStream may not be chained to an instance of FileOutputStream
4) File I/O activities requires use of Exception handling
Question 34)
What will happen when you attempt to compile and run the following code?
import java.io.*;
class ExBase{
abstract public void martley(){
}
}
public class MyEx extends ExBase{
public static void main(String argv[]){
DataInputStream fi = new DataInputStream(System.in);
try{
fi.readChar();
}catch(IOException e){
System.exit(0);
}
finally {System.out.println("Doing finally");}
}
}
1) Compile time error
2) It will run, wait for a key press and then exit
3) It will run, wait for a keypress, print "Doing finally" then exit
4) At run and immediately exit转贴于
Question 35)
What will happen when you attempt to compile and run the following code
public class Borley extends Thread{
public static void main(String argv[]){
Borley b = new Borley();
b.start();
}
public void run(){
System.out.println("Running");
}
}
1) Compilation and run but no output
2) Compilation and run with the output "Running"
3) Compile time error with complaint of no Thread target
4) Compile time error with complaint of no access to Thread package
Question 36)
Assuming any exception handling has been set up, which of the following will create an instance of the RandomAccessFile class
1) RandomAccessFile raf=new RandomAccessFile("myfile.txt","rw");
2) RandomAccessFile raf=new RandomAccessFile( new DataInputStream());
3) RandomAccessFile raf=new RandomAccessFile("myfile.txt");
4) RandomAccessFile raf=new RandomAccessFile( new File("myfile.txt"));
uestion 37)
Given the following class definition
public class Upton{
public static void main(String argv[]){
}
public void amethod(int i){}
//Here
}
Which of the following would be legal to place after the comment //Here ?
1) public int amethod(int z){}
2) public int amethod(int i,int j){return 99;}
3) protected void amethod(long l){ }
4) private void anothermethod(){}
uestion 38)
Which of the following statements are true?
1) Code must be written if the programmer wants a frame to close on selecting the system close menu
2) The default layout for a Frame is the BorderLayout Manager
3) The layout manager for a Frame cannot be changed once it has been assigned
4) The GridBagLayout manager makes extensive use of the the GridBagConstraints class.
Question 39)
Given the following class definition
public class Droitwich{
class one{
private class two{
public void main(){
System.out.println("two");
}
}
}
}
Which of the following statements are true
1) The code will not compile because the classes are nested to more than one level
2) The code will not compile because class two is marked as private
3) The code will compile and output the string two at runtime
4) The code will compile without error
Question 40)
Given the following code
class Base{
static int oak=99;
}
public class Doverdale extends Base{
public static void main(String argv[]){
Doverdale d = new Doverdale();
d.amethod();
}
public void amethod(){
//Here
}
}
Which of the following if placed after the comment //Here, will compile and modify the value of the variable oak?
1) super.oak=1;
2) oak=33;
3) Base.oak=22;
4) oak=50.1;
Question 41)
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
Question 42)
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
Question 43)
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
Question 44)
Given a reference called
t
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) Thread.yield();
3) yield(100); //Or some other suitable amount in milliseconds
4) yield(t);
Question 45)
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 only needs 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
Question 47)
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
Question 48)
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
Question 49)
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.
Question 50)
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
Question 51)
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
Question 52)
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 Javae been given the following information and asked to create a set of classes to represent it.
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
Question 53)
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");
Question 54)
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
Question 55)
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
Question 56)
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--);
Question 57)
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());转
Question 58)
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
Question 59)
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 getWhen method
Question 60)
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{
FileInputStream din = new FileInputStream("Ppvg.java");
din.read();
}catch(IOException ioe){
System.out.println("flytwick");
return 99;
}finally{
System.out.println("fliton");
}
return -1;
}
}
Assuming the file Ppvg.java is available to be read 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
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