2015 JAVA PROGRAMMING
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Q.NO 2
(a)
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Write the value of variable ‘C’ after execution of
the following code:
int d;
int c;
d=7;
c = (5*++d)%3;
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1
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Ans
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1
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(1 mark for correct answer)
OR
(1/2 mark to be awarded if 2 is given as answer on
account of
Student’s knowledge about * and % operators)
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(b)
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What is the difference between jTextField and jPasswordField
components?
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1
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Ans.
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jTextField displays input / output characters as they are.
jPasswordfield does masking of keyboard input from user, using an
echo character ‘*’ by default.
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(1 mark for correct difference)
OR
(1/2 mark for explaining any one)
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(c)
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In a SWITCH statement, what is the purpose of ‘default’ section?
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1
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Ans.
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‘default’ section is used to execute statement(s), when none of
the specified cases mentioned match.
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(1 mark for correct answer)
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(d)
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Write java code to assign the value 500 to variable x. Increase
the value of x by 50 and store it in variable y.
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1
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Ans
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X = 500;
X += 50;
Y = x;
OR
X = 500;
x = x + 50;
y = x;
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(1/2 mark for assigning 500 to x)
(1 mark for increasing value of x by 50)
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(e)
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Write the output that will be generated by the code given below:
Int I;
I = 7;
Int r;
r=8;
while (i<=10)
{
System.out.printIn (r*i);
I =i+2;
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2
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Ans
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56
72
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4-a)
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The following code has some error(s). Rewrite the correct code
underlining all the corrections made.
int marks, temperature;
marks = jTextField.getText());
temperature =
Integer .parseInt (jTextField2.getText());
If (marks < 80) and (temperature >= 40)
{
System.out.printIn (“Not Good “);
}
else;
{
System.out.println( “ OK “);
}
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2
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Ans
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int marks,
temperature;
marks = Integer.parseInt(jTextField.getText());
temperature =
Integer .parseInt (jTextField2.getText());
If( (marks < 80) && (temperature
>= 40) )
{
System.out.printIn (“Not Good “);
}
else
{
System.out.println( “ OK “);
}
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4-b)
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How many times will the following while loop execute?
int y = 7, sum = 0;
while(y <=15)
{
Sum = sum +
y;
y = y +2 ;
}
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2
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Ans
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5 times
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11th and 12th IP Java Programming 2013( Q 2 & Q 4 ) Outside Delhi common assignment
2(a)
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which
property of palette list box is used to enter the list of items while working
in NetBeans?
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1
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ANS
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model
property
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(b)
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What is
the difference between the use of jTextField and JPasswordField in a form?
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1
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Ans
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When we
type text into a JTextField control, it shows the characters in the control,
but in JPasswordField control the typed characters are shown as ( ) for
security.
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(c)
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“the
variable/expression in the switch statement should either evaluate to an
integer value or string value”.
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1
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Ans
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True
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(e)
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How many
times will the following loops execute? Which one of them is entry control
and which one is exit control?
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2
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Loop1
int i=10,
sum=0;
While
(i>1)
{
Sum+=i;
i=3
}
Loop2
int i=10,
sum=0;
do
{
Sum+=i;
i-=3;
}while
(i>1);
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Ans
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Following
loops will execute 3 times.
Loop 1 is
entry control loop and loop 2 is exit control loop.
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(f)
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What will
be displayed in JTextField1 and jTextField2 after the execution of the
following loop?
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2
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ans
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Output
jTextField1-5
jTextField2-9
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