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NO.1 Given the code fragment
int var1 = -5;
int var2 = var1--;
int
var3 = 0;
if (var2 < 0) {
var3 = var2++;
} else {
var3 =
--var2;
}
System.out.println(var3);
What is the result?
A. - 6
B.
- 4
C. - 5
D. 5
E. 4
F. Compilation fails
Answer:
C
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NO.2 Given the code
fragment:
What is the result?
A. Valid
B. Not valid
C. Compilation
fails
D. An IllegalArgumentException is thrown at run time
Answer:
C
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Explanation:
In segment 'if
(valid)' valid must be of type boolean, but it is a string. This makes the
compilation fail.
NO.3 Given the
classes:
*AssertionError
*ArithmeticException
*ArrayIndexOutofBoundsException
*FileNotFoundException
*IllegalArgumentException
*IOError
*IOException
*NumberFormatException
*SQLException
Which
option lists only those classes that belong to the unchecked exception
category?
A. AssertionError, ArrayIndexOutOfBoundsException,
ArithmeticException
B. AssertionError, IOError, IOException
C.
ArithmeticException, FileNotFoundException, NumberFormatException
D.
FileNotFoundException, IOException, SQLException
E.
ArrayIndexOutOfBoundException, IllegalArgumentException,
FileNotFoundException
Answer: A
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Explanation:
Not B: IOError and IOException are both
checked errors.
Not C, not D, not E: FileNotFoundException is a checked
error.
Note:
Checked exceptions:
*represent invalid conditions in areas
outside the immediate control of the program (invalid user
input, database
problems, network outages, absent files)
*are subclasses of Exception
*a
method is obliged to establish a policy for all checked exceptions thrown by its
implementation
(either pass the checked exception further up the stack, or
handle it somehow)
Note:
Unchecked exceptions:
*represent defects in
the program (bugs) - often invalid arguments passed to a non-private
method.
To quote from The Java Programming Language, by Gosling, Arnold, and
Holmes: "Unchecked
runtime exceptions represent conditions that, generally
speaking, reflect errors in your program's
logic and cannot be reasonably
recovered from at run time."
*are subclasses of RuntimeException, and are
usually implemented using IllegalArgumentException,
NullPointerException, or
IllegalStateException
*method is not obliged to establish a policy for the
unchecked exceptions thrown by its
implementation (and they almost always do
not do so)
NO.4 Class StaticField {
static int i = 7;
public static
void main(String[] args) {
StaticFied obj = new
StaticField();
obj.i++;
StaticField.i++;
obj.i++;
System.out.println(StaticField.i
+ " "+ obj.i); } }
What is the result?
A. 10 10
B. 8 9
C. 9 8
D.
7 10
Answer: A
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NO.5 Which code
fragment is illegal?
A. Option A
B. Option B
C. Option C
D. Option
D
Answer: D
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Explanation:
The abstract keyword
cannot be used to declare an int variable.
The abstract keyword is used to
declare a class or method to be abstract[3]. An abstract method has
no
implementation; all classes containing abstract methods must themselves be
abstract, although
not all abstract classes have abstract
methods.
NO.6 View the exhibit.
Given the code fragment:
Which
change enables the code to print the following?
James age: 20 Williams age:
32
A. Replacing line 5 with public static void main (String [] args) throws
MissingInfoException,
AgeOutofRangeException {
B. Replacing line 5 with
public static void main (String [] args) throws.Exception {
C. Enclosing line
6 and line 7 within a try block and adding: catch(Exception e1) { //code goes
here}
catch (missingInfoException e2) { //code goes here} catch
(AgeOutofRangeException e3) {//code goes
here}
D. Enclosing line 6 and
line 7 within a try block and adding: catch (missingInfoException e2) {
//code
goes here} catch (AgeOutofRangeException e3) {//code goes
here}
Answer: C
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NO.7 Given:
package p1;
public class Test {
static
double dvalue;
static Test ref;
public static void main(String[] args)
{
System.out.println(ref);
System.out.println(dvalue);
}
}
What
is the result?
A. p1.Test.class
0.0
B. <the summary address
refrenced by ref> 0.000000
C. Null
0.0
D. Compilation fails
E. A
NullPointerException is thrown at runtime
Answer: C
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NO.8 Given:
What is the
result?
A. They match They really match
B. They really match
C. They
match
D. Nothing Prints
E. They really match They really match
Answer:
B
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Explanation:
The strings are not the same objects so
the == comparison fails. See note #1 below.
As the value of the strings are
the same equals is true. The equals method compares values
for
equality.
Note: #1 ==
Compares references, not values. The use of
== with object references is generally limited to the
following:
Comparing
to see if a reference is null.
Comparing two enum values. This works because
there is only one object for each enum constant.
You want to know if two
references are to the same object.
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