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Java选择题复习题英文.pdf
Mock Java Certification Exam1
jchq.net
Mock Java Certification Exam
Java Programmer Certification Mock Exam No. 2
jchq.net
Java Programmer Certification Mock Exam No. 2
Mock Java Certification Exam
`
Java Programmer Certification Mock Exam No 1
Copyright ©Marcus Green 2002
Last Updated 18 Sep 2003
This exam is based on the objectives of the JDK 1.2 exam.
You can see set of 60 questions for the JDK1.4 exam at JDK1.4 Exam
Buy Java Certification books containg more mock exams at
http://www.jchq.net/bookreviews/jcertbooks.htm
This is my mock Exam No 1 based on the Objectives for the Sun Java Programmers Exam. It was created by Marcus
Green (mail@marcusgreen.co.uk) and may be freely distributed so long as it is unmodified. Please email me if you
have any corrections or comments, but please read this document first
http://www.jchq.net/homepage/getanswers.htm.
If you obtained this exam from some other source please email me to let me know and check out the latest version at
http://www.jchq.net
It really does come with answers
Yes, this is a long document (around 35 pages if you were to print it out), if you cannot see the answers then you
have not got the entire document, try reloading it untill you can see the answer to Question 60 and the words "End
of document";. The answers contain references to approximately which objective the question relates to. If you have
a query about any of these questions, please, please include the full answer with the question.
Why not discuss this exam with other people ?
You can post a message on the discussion forum at http://www.jchq.net/discus You could also send me your
question but I get heaps of email and my answer is likely to be slow and terse.
How does this compare with the real thing?
As of 5 Oct 2000 the question format has changed very slightly. You will now get more questions that include
snippets (though the ratio may be similar to this mock exam). Each question will also tell you how many of the
options you need to pick. You can read more about these revisions at http://www.jchq.net/faq/ExamUpdate.htm.
You should assume that the real thing will be harder though many people have told me that they get similar marks
in the real thing to my exams. Take a look at the "how jchq helped me" forum at http://www.jchq.net/discus to find
how other people find the real exam and this material.
Where can you find other Mock Exams?
Check out my FAQ at http://www.jchq.net/faq/jcertfaq.htm for links to other mock exams You will find links to
many good mock exams that add up to hundreds of questions. You can check out my second mock exam that
contains 60 question at http://www.jchq.net/mockexams/exam2.htm
If you think you have found an error:-
Please include which exam you are referring to, ie 1 or 2 (and maybe soon 3)
http://www.jchq.net/mockexams/exam1.htm[2015/1/20 16:04:48]
Mock Java Certification Exam
Read the questions carefully
I have tried to make the questions unambiguous (the meaning should be obvious), but make sure you have read what
I have written not what you think I might have written. Thus if it says "Classes can be declared with the private
modifier ", it means It is possible to declare a class with the private modifier and not that all classes in all situations
can be declared as private. Each question may have one or more correct Answers.
Questions
Question 1)
Which of the following lines will compile without warning or error.
1) float f=1.3;
2) char c="a";
3) byte b=257;
4) boolean b=null;
5) int i=10;
Answer to Question 1
Question 2)
What will happen if you try to compile and run the following code
amethod(arguments);
System.out.println(arguments);
System.out.println(arguments[1]);
public class MyClass {
public static void main(String arguments[]) {
}
public void amethod(String[] arguments) {
}
}
1) error Can't make static reference to void amethod.
2) error method main not correct
3) error array must include parameter
4) amethod must be declared with String
Answer to Question 2
Question 3)
Which of the following will compile without error
1)
import java.awt.*;
package Mypackage;
class Myclass {}
2)
package MyPackage;
import java.awt.*;
class MyClass{}
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Mock Java Certification Exam
3)
/*This is a comment */
package MyPackage;
import java.awt.*;
class MyClass{}
Answer to Question 3
Question 4)
A byte can be of what size
1) -128 to 127
2) (-2 power 8 )-1 to 2 power 8
3) -255 to 256
4)depends on the particular implementation of the Java Virtual machine
Answer to Question 4
Question 5)
What will be printed out if this code is run with the following command line?
System.out.println(argv[2]);
java myprog good morning
public class myprog{
public static void main(String argv[])
{
}
}
1) myprog
2) good
3) morning
4) Exception raised: "java.lang.ArrayIndexOutOfBoundsException: 2"
Answer to Question 5
Question 6)
Which of the following are keywords or reserved words in Java?
1) if
2) then
3) goto
4) while
5) case
Answer to Question 6
Question 7)
http://www.jchq.net/mockexams/exam1.htm[2015/1/20 16:04:48]
Mock Java Certification Exam
Which of the following are legal identifiers
1) 2variable
2) variable2
3) _whatavariable
4) _3_
5) $anothervar
6) #myvar
Answer to Question 7
Question 8)
What will happen when you compile and run the following code?
public class MyClass{
static int i;
public static void main(String argv[]){
System.out.println(i);
}
}
1) Error Variable i may not have been initialized
2) null
3) 1
4) 0
Answer to Question 8
Question 9)
What will happen if you try to compile and run the following code?
public class Q {
public static void main(String argv[]){
int anar[]=new int[]{1,2,3};
System.out.println(anar[1]);
}
}
1) 1
2) Error anar is referenced before it is initialized
3) 2
4) Error: size of array must be defined
Answer to Question 9
Question 10)
What will happen if you try to compile and run the following code?
public class Q {
public static void main(String argv[]){
int anar[]=new int[5];
System.out.println(anar[0]);
}
}
http://www.jchq.net/mockexams/exam1.htm[2015/1/20 16:04:48]
Mock Java Certification Exam
1) Error: anar is referenced before it is initialized
2) null
3) 0
4) 5
Answer to Question 10
Question 11)
What will be the result of attempting to compile and run the following code?
abstract class MineBase {
abstract void amethod();
static int i;
}
public class Mine extends MineBase {
public static void main(String argv[]){
int[] ar=new int[5];
for(i=0;i < ar.length;i++)
System.out.println(ar[i]);
}
}
1) a sequence of 5 0's will be printed
2) Error: ar is used before it is initialized
3) Error Mine must be declared abstract
4) IndexOutOfBoundes Error
Answer to Question 11
Question 12)
What will be printed out if you attempt to compile and run the following code ?
int i=1;
switch (i) {
case 0:
System.out.println("zero");
break;
case 1:
System.out.println("one");
case 2:
System.out.println("two");
default:
System.out.println("default");
}
1) one
2) one, default
3) one, two, default
4) default
Answer to Question 12
Question 13)
What will be printed out if you attempt to compile and run the following code?
int i=9;
switch (i) {
default:
System.out.println("default");
http://www.jchq.net/mockexams/exam1.htm[2015/1/20 16:04:48]
Mock Java Certification Exam
case 0:
System.out.println("zero");
break;
case 1:
System.out.println("one");
case 2:
System.out.println("two");
}
1) default
2) default, zero
3) error default clause not defined
4) no output displayed
Answer to Question 13
Question 14)
Which of the following lines of code will compile without error
1)
int i=0;
if(i) {
System.out.println("Hello");
}
2)
boolean b=true;
boolean b2=true;
if(b==b2) {
System.out.println("So true");
}
3)
int i=1;
int j=2;
if(i==1|| j==2)
System.out.println("OK");
4)
int i=1;
int j=2;
if(i==1 &| j==2)
System.out.println("OK");
Answer to Question 14
Question 15)
What will be output if you try to compile and run the following code, but there is
no file called Hello.txt in the current directory?.
Mine m=new Mine();
System.out.println(m.amethod());
import java.io.*;
public class Mine {
public static void main(String argv[]){
}
public int amethod() {
try {
FileInputStream dis=new FileInputStream("Hello.txt");
}catch (FileNotFoundException fne) {
System.out.println("No such file found");
return -1;
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Mock Java Certification Exam
}catch(IOException ioe) {
} finally{
System.out.println("Doing finally");
}
return 0;
}
}
1) No such file found
2 No such file found ,-1
3) No such file found, Doing finally, -1
4) 0
Answer to Question 15
Question 16)
Which of the following statements are true?
1) Methods cannot be overriden to be more private
2) static methods cannot be overloaded
3) private methods cannot be overloaded
4) An overloaded method cannot throw exceptions not checked in the base class
Answer to Question 16
Question 17)
What will happen if you attempt to compile and run the following code?
Base b=new Base();
Sub s=(Sub) b;
class Base {}
class Sub extends Base {}
class Sub2 extends Base {}
public class CEx{
public static void main(String argv[]){
}
}
1) Compile and run without error
2) Compile time Exception
3) Runtime Exception
Answer to Question 17
Question 18)
Which of the following statements are true?
1) System.out.println( -1 >>> 2);will output a result larger than 10
2) System.out.println( -1 >>> 2); will output a positive number
3) System.out.println( 2 >> 1); will output the number 1
4) System.out.println( 1 <<< 2); will output the number 4
Answer to Question 18
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Mock Java Certification Exam
Question 19)
What will happen when you attempt to compile and run the following code?
public class Tux extends Thread{
static String sName = "vandeleur";
public static void main(String argv[]){
Tux t = new Tux();
t.piggy(sName);
System.out.println(sName);
}
public void piggy(String sName){
sName = sName + " wiggy";
start();
}
public void run(){
for(int i=0;i < 4; i++){
sName = sName + " " + i;
}
}
}
1) Compile time error
2) Compilation and output of "vandeleur wiggy"
3) Compilation and output of "vandeleur wiggy 0 1 2 3"
4) Compilation and output of either "vandeleur", "vandeleur 0", "vandeleur 0 1" "vandaleur 0 1 2" or "vandaleur 0 1
2 3"
Answer to Question 19
Question 20)
What will be displayed when you attempt to compile and run the following code
Butt MyBut=new Butt();
Button HelloBut=new Button("Hello");
Button ByeBut=new Button("Bye");
add(HelloBut);
add(ByeBut);
setSize(300,300);
setVisible(true);
//Code start
import java.awt.*;
public class Butt extends Frame{
public static void main(String argv[]){
}
Butt(){
}
}
//Code end
1) Two buttons side by side occupying all of the frame, Hello on the left and Bye on
the right
2) One button occupying the entire frame saying Hello
3) One button occupying the entire frame saying Bye
4) Two buttons at the top of the frame one saying Hello the other saying Bye
Answer to Question 20
Question 21)
http://www.jchq.net/mockexams/exam1.htm[2015/1/20 16:04:48]
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