Download Compiled by : Prof. M. A. Ansari (Engineering Science Dept

FPL-II --- Unit 2
Question 154
Option A
Option B
Option C
Option D
Correct Answer
Question 155
Option A
Option B
Option C
Option D
Correct Answer
Question 156
Option A
Option B
Option C
Option D
Correct Answer
Question 157
Option A
Option B
Option C
Option D
Correct Answer
Question 158
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JSPM’s RSCOE, Pune - 33
Consider
the following program:
import myLibrary.*;
public class ShowSomeClass
{
// code for the class...
}
What is the name of the java file containing this program?
myLibrary.java
ShowSomeClass.java
ShowSomeClass
ShowSomeClass.class
B
Consider the following code snippet
String rive
r = new String(“Columbia”);
System.out.println(river.length());
What is printed?
6
7
8
Columbia
C
Consider
public class MyClass{
public MyClass(){/*code*/}
// more code...
}
To instantiate MyClass, you would write?
MyClass mc = new MyClass();
MyClass mc = MyClass();
MyClass mc = MyClass;
MyClass mc = new MyClass;
A
You read the following statement in a Java program that compiles
and executes.
submarine.dive(depth);
What can you say for sure?
depth must be an int
dive must be a method.
dive must be the name of an instance field.
submarine must be the name of a class
B
Guess the output of the following program.
public class NumberSystem{
public static void main(String[]args) {
int hexVal = 0x1a;
System.out.println(“Value:”+hexVal);
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)
FPL-II --- Unit 2
Option A
Option B
Option C
Option D
Correct Answer
Question 159
Option A
Option B
Option C
Option D
Correct Answer
Question 160
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JSPM’s RSCOE, Pune - 33
}}
25
32
26
24
C
Guess the output of the following program.
public class NumberSystem{
public static void main(String[]args) {
int val = 0b11010;
System.out.println(“Value:”+val);
}}
32
28
64
26
D
Consider the following code snippet. What will be assigned to the
variable fourthChar, if the code is executed?
String str = new String(“Java”);
char fourthChar = str.charAt(4);
Option A
Option B
Option C
Option D
Correct Answer
Question 161
Option A
Option B
Option C
Option D
Correct Answer
‘a’
‘v’
throws StringIndexOutofBoundsException
null character
C
public class test {
static boolean fun(char ch)
{System.out.println(ch);
return true;
}
public static void main(String[] args) {
int i=0;
for(fun('P');fun('Q')&&(i<3);fun('R'))
{
i++;
fun('S');
}
}
}
PQRSPQRSPQRS
PQSRQSRQSRQ
Compilation Error
None of these
B
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)
FPL-II --- Unit 2
Question 162
Option A
Option B
Option C
Option D
Correct Answer
Question 163
Option A
Option B
Option C
Option D
Correct Answer
Question 164
Option A
Option B
Option C
Option D
Correct Answer
Question 165
Option A
Option B
Option C
2-59
JSPM’s RSCOE, Pune - 33
Consider,
for(i=1,j=1;i<5;i++)
j+=i;
System.out.println(i);
4
5
6
None of these
B
What will be the output of this code?
class Test {
protected int x, y;
}
class Main {
public static void main(String args[]) {
Test t = new Test();
System.out.println(t.x + " " + t.y);
}
}
00
Compilation error
Run time error
None of these
A
class Main {
public static void main(String args[]) {
System.out.println(fun());
}
int fun() {
return 20;
}
}
20
Compilation error
None of these
Infinite loop
B
class Main {
public static void main(String args[]) {
System.out.println(fun());
}
static int fun() {
return 20;
}
}
20
Compilation error
None of these
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)
FPL-II --- Unit 2
Option D
Correct Answer
Question 166
Option A
Option B
Option C
Option D
Correct Answer
Question 167
Option A
Option B
Option C
Option D
Correct Answer
Question 168
Option A
Option B
Option C
Option D
Correct Answer
2-60
JSPM’s RSCOE, Pune - 33
Infinite loop
A
class Test {
public static void main(String args[]) {
System.out.println(fun());
}
static int fun() {
static int x= 0;
return ++x;
}
}
0
1
2
Compilation error
D
class Test {
private static int x;
public static void main(String args[]) {
System.out.println(fun());
}
static int fun() {
x=2;
return ++x;
}
}
2
3
4
Compilation error
B
class demo{
int a=4;
public void show()
{
System.out.println(a);
}
public static void main(String args[])
{
a++;
show();
}
}
4
5
6
Compilation error
D
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)
FPL-II --- Unit 2
Question 169
Option A
Option B
Option C
Option D
Correct Answer
Question 170
Option A
Option B
Option C
Option D
Correct Answer
Question 171
Option A
Option B
Option C
Option D
Correct Answer
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JSPM’s RSCOE, Pune - 33
class Foo {
public int a=3;
public void addFive() {
a+=5;
System.out.print("f ");
}
public static void main(String[]args) {
Foo f = new Foo();
f.addFive();
System.out.println(f.a);
}
}
f
8
f8
None of these
C
class app
{
public static void main(String[] args)
{
char char1;
char1 = 65;
System.out.println("char1 + 1 = "+ char1 +1);
}
}
char1 + 1 = a
char1 + 1 = A
char1 + 1 = A1
char1 + 1 = a1
C
Consider the following code snippet.
if (aNumber >= 0)
if (aNumber == 0)
System.out.println("first string");
else
System.out.println("second string");
System.out.println("third string");
What output do you think the code will produce if aNumber is 3?
first string
second string
third string
third string
first string
third string
B
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)
FPL-II --- Unit 2
Question 172
Option A
Option B
Option C
Option D
Correct Answer
Question 173
Option A
Option B
Option C
Option D
Correct Answer
Question 174
Option A
Option B
Option C
Option D
Correct Answer
Question 175
2-62
JSPM’s RSCOE, Pune - 33
import java.util.*;
class Pattern {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
System.out.print("Enter N: ");
int N=input.nextInt();
for(int i=1;i<=N;i++)
{
for(int j=0;j<N-i;j++)
System.out.print(" ");
for(int j=0;j<(2*i-1);j++)
System.out.print("*");
System.out.println();
}
}
} What will be the output if N=3?
*
***
*****
*
**
***
*****
Compilation error.
A
Consider the code:
String x = new String("xyz");
String y = "abc";
x = x + y;
How many String objects have been created?
2
3
4
5
C
Consider the code:
String x = new String("xyz");
String y = "abc";
x = x + y;
What will be the output of the program?
xyzabc
xyz
abc
xyz abc
A
class BoolTest
{
public static void main(String [] args)
{
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)
FPL-II --- Unit 2
Option A
Option B
Option C
Option D
Correct Answer
Question 176
Option A
Option B
Option C
Option D
Correct Answer
Question 177
Option A
Option B
Option C
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JSPM’s RSCOE, Pune - 33
int result = 0;
Boolean b1 = new Boolean("TRUE");
Boolean b2 = new Boolean("ture");
if (b1.equals(b2) )
result = result + 1000;
System.out.println("result = " + result);
}
}
What will be the output of this code?
result = 0
result = 1000
result = 2000
None of these
A
class BoolTest
{
public static void main(String [] args)
{
int result = 0;
Boolean b1 = new Boolean("TRUE");
Boolean b2 = new Boolean("true");
if (b1.equals(b2) )
result = result + 1000;
System.out.println("result = " +result);
}
}
What will be the output of this code?
result = 0
result = 1000
result = 2000
None of these
B
class BoolTest
{
public static void main(String [] args)
{
int result = 0;
Boolean b1 = new Boolean("TRUE");
Boolean b2 = new Boolean("TRUE");
if (b1.equals(b2) )
result = result + 1000;
System.out.println("result= "+(result+1000));
}
}
What will be the output of this code?
result=0
result=1000
result=2000
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)
FPL-II --- Unit 2
Option D
Correct Answer
Question 178
Option A
Option B
Option C
Option D
Correct Answer
Question 179
Option A
Option B
Option C
Option D
Correct Answer
Question 180
2-64
JSPM’s RSCOE, Pune - 33
None of these
C
class BoolTest {
public static void main(String [] args) {
int result = 0;
Boolean b1 = new Boolean("TRUE");
Boolean b2 = new Boolean("TRUE");
if (b1 == b2)
result = 1;
System.out.println("result = " + (result +1000));
}}
result = 0
result = 1000
result = 1
result = 2000
B
class BoolTest {
public static void main(String [] args) {
int result = 0;
Boolean b1 = new Boolean("TRUE");
Boolean b2 = new Boolean("true");
Boolean b3 = new Boolean("tRuE");
Boolean b4 = new Boolean("false");
if (b1 == b2) /* Line 10 */
result = 1;
if (b1.equals(b2) ) /* Line 12 */
result = result + 10;
if (b2 == b4) /* Line 14 */
result = result + 100;
if (b2.equals(b4) ) /* Line 16 */
result = result + 1000;
if (b2.equals(b3) ) /* Line 18 */
result = result + 10000;
System.out.println("result = " + result);
}}
result = 0
result = 1
result = 10
result = 10010
D
class ObjComp {
public static void main(String [] args ) {
int result = 0;
ObjComp oc = new ObjComp();
Object o = oc;
if (o == oc)
result = 1;
if (o != oc)
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)
FPL-II --- Unit 2
Option A
Option B
Option C
Option D
Correct Answer
Question 181
Option A
Option B
Option C
Option D
Correct Answer
Question 182
Option A
Option B
Option C
Option D
Correct Answer
Question 183
Option A
Option B
Option C
Option D
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JSPM’s RSCOE, Pune - 33
result = result + 10;
if (o.equals(oc) )
result = result + 100;
if (oc.equals(o) )
result = result + 1000;
System.out.println("result = " + result);
}}
result = 1
result = 10
result = 101
result = 1101
D
String x = "xyz";
x.toUpperCase(); /* Line 2 */
String y = x.replace('Y', 'y');
y = y + "abc";/* Line 4 */
System.out.println(y);
What will be the output of the program?
abcXyZ
abcxyz
xyzabc
XyZabc
C
int i = 1, j = 10;
do
{
if(i++ > --j) /* Line 4 */
{
continue; }
} while (i < 5);
System.out.println("i = " + i + "and j = " + j); /* Line 9 */
What will be the output of the program?
i = 6 and j = 5
i = 5 and j = 5
i = 6 and j = 6
i = 5 and j = 6
D
class Q207 {
public static void main(String[] args) {
int i1 = 5;
int i2 = 6;
String s1 = "7";
System.out.println(i1 + i2 + s1); /* Line 8 */
} } What will be the output of the program?
18
117
567
Compiler error
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)
FPL-II --- Unit 2
Correct Answer
Question 184
Option A
Option B
Option C
Option D
Correct Answer
Question 185
Option A
Option B
Option C
Option D
Correct Answer
Question 186
Option A
Option B
Option C
Option D
Correct Answer
Question 187
Option A
Option B
Option C
Option D
Correct Answer
Question 188
2-66
JSPM’s RSCOE, Pune - 33
B
class SqrtExample
{
public static void main(String [] args) {
double value = -9.0;
System.out.println( Math.sqrt(value));
} } What will be the output of the program?
3.0
-3.0
NaN (Not a Number)
Compilation fails.
C
String s = "ABC";
s.toLowerCase();
s += "def";
System.out.println(s);
What will be the output of the program?
ABC
abc
ABCdef
Compile Error
C
System.out.println(Math.sqrt(-4D));
What will be the output of the program?
-2
NaN
Compile Error
Runtime Exception
B
String a = "newspaper";
a = a.substring(5,7);
char b = a.charAt(1);
a = a + b;
System.out.println(a);
What will be the output of the program?
apa
app
apea
apep
B
public class StringRef {
public static void main(String [] args)
{
String s1 = "abc";
String s2 = "def";
String s3 = s2; /* Line 7 */
s2 = "ghi";
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)
FPL-II --- Unit 2
2-67
JSPM’s RSCOE, Pune - 33
System.out.println(s1 + s2 + s3);
Option A
Option B
Option C
Option D
Correct Answer
Question 189
Option A
Option B
Option C
Option D
Correct Answer
Question 190
Option A
Option B
Option C
Option D
Correct Answer
Question 191
}
}
What will be the output of the program?
abcdefghi
abcdefdef
abcghidef
abcghighi
C
class Test138 {
public static void stringReplace (String text)
{ text = text.replace ('j' , 'c'); /* Line 5 */ }
public static void bufferReplace (StringBuffer text)
{ text = text.append ("c"); /* Line 9 */ }
public static void main (String args[]) {
String textString = new String ("java");
StringBuffer textBuffer = new StringBuffer ("java"); /* Line 14 */
stringReplace(textString);
bufferReplace(textBuffer);
System.out.println (textString + textBuffer); } }
java
javac
javajavac
Compile error
C
String a = "ABCD";
String b = a.toLowerCase();
b.replace('a','d');
b.replace('b','c');
System.out.println(b);
What will be the output of the program?
abcd
ABCD
dccd
dcba
A
public class ExamQuestion6 {
static int x;
boolean catch() {
x++;
return true; }
public static void main(String[] args) {
x=0;
if ((catch() | catch()) || catch())
x++;
System.out.println(x); } }
What will be the output of the program?
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)
FPL-II --- Unit 2
Option A
Option B
Option C
Option D
Correct Answer
Question 192
Option A
Option B
Option C
Option D
Correct Answer
Question 193
Option A
Option B
Option C
Option D
Correct Answer
Question 194
Option A
Option B
Option C
Option D
Correct Answer
2-68
JSPM’s RSCOE, Pune - 33
1
2
3
Compilation Fails
D
String s = "hello";
Object o = s;
if( o.equals(s) )
{ System.out.println("A"); }
else
{ System.out.println("B"); }
if( s.equals(o) )
{ System.out.println("C"); }
else
{
System.out.println("D"); }
What will be the output of the program?
AC
BD
CD
AB
A
Which will legally declare, construct, and initialize an array?
int [] myList = {"1", "2", "3"};
int [] myList = (5, 8, 2);
int myList [] [] = {4,9,7,0};
int myList [] = {4, 3, 7};
D
public interface Foo
{
int k = 4; /* Line 3 */
}
public interface Foo
{
int k = 4; /* Line 3 */
}
Which three piece of codes are equivalent to line 3?
1. final int k = 4;
2. public int k = 4;
3. static int k = 4;
4. abstract int k = 4;
5. volatile int k = 4;
6. protected int k = 4;
1, 2 and 3
2, 3 and 4
3, 4 and 5
4, 5 and 6
A
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)
FPL-II --- Unit 2
Question 195
Option A
Option B
Option C
Option D
Correct Answer
Question 196
Option A
Option B
Option C
Option D
Correct Answer
Question 197
Option A
Option B
Option C
Option D
Correct Answer
Question 198
Option A
Option B
Option C
Option D
Correct Answer
Question 199
Option A
Option B
Option C
Option D
Correct Answer
Question 200
Option A
Option B
Option C
Option D
Correct Answer
2-69
JSPM’s RSCOE, Pune - 33
Which one of the following will declare an array and initialize it with five
numbers?
Array a = new Array(5);
int [] a = {23,22,21,20,19};
int a [] = new int[5];
int [5] array;
B
Which one is a valid declaration of a boolean?
boolean b1 = 0;
boolean b2 = 'false';
boolean b3 = false;
boolean b4 = Boolean.false();
C
switch(x)
{
default:
System.out.println("Hello");
}
Which two are acceptable types for x?
byte and char
long and float
char and short
float and long
A
public void test(int x)
{ int odd = 1;
if(odd) /* Line 4 */
{
System.out.println("odd"); }
else
{ System.out.println("even");} } Which statement is true?
Compilation fails.
"odd" will always be output.
"even" will always be output.
"odd" will be output for odd values of x, and "even" for even values.
A
public class While {
public void loop() {
int x= 0;
while ( 1 ) /* Line 6 */
{ System.out.print("x plus one is " + (x + 1)); /* Line 8 */ }
} } Which statement is true?
There is a syntax error on line 1.
There are syntax errors on lines 1 and 6.
There are syntax errors on lines 1, 6, and 8.
There is a syntax error on line 6.
D
Which is valid declaration of a float?
float f = 1F;
float f = 1.0;
float f = "1";
float f = 1.0d;
A
Compiled by : Prof. M. A. Ansari (Engineering Science Dept.)