data.xml

一个考试系统 基于xml数据库 没有利用任何工具读取数据库

<test1>
<!--------------------------------------------------------------------------->
<question>
<note>
multiple selection
</note>
<detail>
Given
1	public class X{
2		public Object m(){
3			Object o = new Float(3.14F);
4			Object [] oa = new Object[1];
5			oa[0] = o;
6			o=null;
7			return oa[0];
8		}
9	}

When is the Float object, created in line 3,eligible for garbage collection?
</detail>
<choice>
just after line 5
just after line 6
just after line 7(that is,as the method returns)
never in this method
</choice>
<answer>
0001
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
multiple selection
</note>
<detail>
Consider the following classes:
	public class Test {
		public static void test() {
			this.print();
		}
		public static void print() {
			System.out.println("Test");
		}
		public static void main(String args []) {
			test();
		}
	}
What is the result of compiling and running this class?
</detail>

<choice>
The string Test is printed to the standard out. 
A runtime exception is raised stating that an object has not been created. 
Nothing is printed to the standard output. 
An exception is raised stating that the method test cannot be found. 
An exception is raised stating that the variable this can only be used within an instance. 
The class fails to compile stating that the variable this is undefined.
</choice>
<answer>
000001
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
Which of these is the correct format to use to create the literal char value a?

A)	'a' 
B)	"a" 
C)	new Character(a) 
D)	\000a 
Select the most appropriate answer.
</detail>
<choice>
A
B
C
D
</choice>
<answer>
1000
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
What will be printed out if this code is run with the following command line
java  myprog  good  morning

public class myprog{
	public static void main(String argv[]) 
	{
		System.out.println(argv[2])
	}
}

Select the most appropriate answer.
</detail>
<choice>
myprog
good
morning
Exception raised: "java.lang.ArrayIndexOutOfBoundsException: 2"
</choice>
<answer>
0001
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
What will happen if you try to compile and execute B's main() method?
class A {
   int i;
   A(int i) {
      this.i = i * 2;
   }
}
class B extends A {
   public static void main(String[] args) {
      B b = new B(2);
   }
   B(int i) {
      System.out.println(i);
   }
}

Select the one right answer.
</detail>
<choice>
The instance variable i is set to 4
The instance variable i is set to 2
The instance variable i is set to 0
This code will not compile
</choice>
<answer>
0001
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
What happens when you try to compile and run the following program?
class Mystery {
   String s;
   public static void main(String[] args) {
      Mystery m = new Mystery();
      m.go();
   }
   void Mystery() {
      s = "constructor";
   }
   void go() {
      System.out.println(s);
   }
}
Select the one right answer.
</detail>
<choice>
this code will not compile
this code compiles but throws an exception at runtime
this code runs but nothing appears in the standard output
this code runs and "constructor" in the standard output
this code runs and writes "null" in the standard output
</choice>
<answer>
00001
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
public class Foo{
	public static void main(String sgf[]){
		StringBuffer a = new StringBuffer("A");
		StringBuffer b = new StringBuffer("B");
		operate(a,b);
		System.out.println(a+","+b);
	}
	static void operate(StringBuffer x,StringBuffer y){
		x.append(y);
		y=x;
	}
}
What is the result?
</detail>
<choice>
The code compiles and prints "A.B".
The code compiles and prints "A.A".
The code compiles and prints "B.B".
The code compiles and prints "AB.B".
The code compiles and prints "AB.AB".
</choice>
<answer>
00010
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
multiple selection
</note>
<detail>
Which of the following statements will cause a compiler error.
</detail>
<choice>
float F=4096.0;
double D=4096.0;
byte B=4096;
char C=4096;
</choice>
<answer>
1010
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
Consider the following program:
public class Test { 
	public static void main (String args []) {
		boolean a = false;
		if (a = true)
			System.out.println("Hello");
		else
			System.out.println("Goodbye");
		}
	}
}
What is the result:
</detail>
<choice>
Program produces no output but terminates correctly.
Program does not terminate.
Prints out "Hello"
Prints out "Goodbye"
</choice>
<answer>
0010
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
Given the following class definition: 
	class A{
		protected int i;
		A(int i){
			this.i=i;
			}
		}
which of the following would be a valid inner class for this class?
Select  all valid answers:
</detail>
<choice>
class B{}
class B extends A{}
class B extends A{ B(){System.out.println("i="+i);} }
class B{  class A{}	}
class A{}
</choice>
<answer>
10000
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
In the following method, which may be called with any kind of Object, we want to "short circuit" the logical test in line 2 if the object is not a Long. Which logical operator should replace the X in line 2 to accomplish this?
1. 	long Test(Object ob){
2. 	if(Ob instanceof Long X ((Long)Ob).longValue()>999){
3. 	return((Long)Ob).longValue();
4. 	}
5. 	return -1L;
6. 	}
</detail>
<choice>
Replace 'X' with '&&'.
Replace 'X' with '||'.
Replace 'X' with '&'.
Replace 'X' with '|'.
</choice>
<answer>
1000
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
What happens on trying to compile and run the following code?
public class EqualsTest{
	public static void main(String args[]){
		Object A=new Long(7);
		Long L=new Long(7);
		if(A.equals(L)) 
			System.out.println("Equal");
		else 
			System.out.println("Not Equal");
		}
	}
}
</detail>
<choice>
The program compiles and prints "Equal".
The program compiles and prints "Not Equal".
The compiler objects to line 5.
A runtime cast error occurs at line 5.
</choice>
<answer>
1000
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
Why won't the following class compile?
class A {
   private int x;
   public static void main(String[] args) {
      new B();
   }
   class B {
      B() {
         System.out.println(x);
      }
   }
}
Select the one right answer.
</detail>
<choice>
Class B tries to access a private variable defined in its ouer class.
Class A attempts to create an instance of B when there is no current instance of class A.
Class B's constructor must be public.
</choice>
<answer>
010
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
What happens on trying to compile the following code?

interface Foo{
	int k=0;
}

public class Test implements Foo{
	public static void main(String args[]){
		int i;
		Test test = new Test();
		i=test.k;
		i=Test.k;
		i=Foo.k;
	}
}
</detail>
<choice>
Compilation succeeds.
An error at line 2 causes compilation to fail.
An error at line 9 causes compilation to fail.
An error at line 10 causes compilation to fail.
An error at line 11 causes compilation to fail.
</choice>
<answer>
10000
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
multiple selection
</note>
<detail>
Which interface implementations can you add as listeners for a TextField object?Select all valid answers.
</detail>
<choice>
ActionListener
FocusListener
MouseMotionListener
WindowListener
ContainerListener
</choice>
<answer>
11100
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
multiple selection
</note>
<detail>
Which statements are true about Listeners?
</detail>
<choice>
At most one listener can be added to any simple Component.
The return value from a listener is used to control the invocation of other listener
if multiple listeners are added to a single component, they must all be made friends to each other
if multiple listeners are added to single component, the order of invocation of the listener is not specified.
In the AWT, listener methods generally take an argument, which is an instance of some subclass of java.awt.AWTEvent class.
</choice>
<answer>
00011
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
Which method you define as the starting point of new thread in a class from which the new thread can be excution?
</detail>
<choice>
public void start()	
public void run()	
public void int()
public static void main(String args[])	
public void runnable()
</choice>
<answer>
01000
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
Which modifier should be applied to a method for the lock of object this to be obtained prior to excution any of the method body?
</detail>
<choice>
synchronized
abstract	
final
static
public
</choice>
<answer>
10000
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
multiple selection
</note>
<detail>
Give the following method:
	public void example(){
		try{
			unsafe();
			System.out.println("Test1");
		}catch(SafeException e){System.out.println("Test 2");
		}finally{System.out.println("Test 3");}
		System.out.println("Test 4");
Which will display if method unsafe () run normally?
</detail>
<choice>
Test 1	
Test 2	
Test 3	
Test 4
</choice>
<answer>
1011
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
Carefully examine the following code:

public class StaticTest {
	static {
		System.out.println("Hi there");
	}
	public void print() {
		System.out.println("Hello");
	}
	public static void main(String args []) {
		StaticTest st1 = new StaticTest();
		st1.print();
		StaticTest st2 = new StaticTest();
		st2.print();
	}
}
When will the string "Hi there" be printed?
</detail>
<choice>
Never. 
Each time a new instance is created. 
Once when the class is first loaded into the Java virtual machine. 
Only when the static method is called explicitly.
</choice>
<answer>
0010
</answer>
</question>
<!--------------------------------------------------------------------------->
<question>
<note>
single selection
</note>
<detail>
A class design requires that a member variable should be accessible only by same package, which modifer word should be used?
</detail>
<choice>
protected	
public	
no modifer	
private
</choice>
<answer>
0010
</answer>
</question>
<!--------------------------------------------------------------------------->
</test1>