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SCJP
Sample questions
The following questions
are sample questions for SCJP
If any queries regarding the questions or answers please mail us |
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21)
class C{
public static void main (String[] args) {
byte
b1=33;
//1
b1++;
//2
byte
b2=55;
//3
b2=b1+1;
//4
System.out.println(b1+""+b2);
}}
compile time error at line 2
compile time error at line 4
prints 34,56
runtime exception
none of the above
Explanation:
b1+1 returns an integer value which can not be assigned to a byte
variable
Ans: 2 |
22)
import java.util.*;
class C
{
final Vector v;
C()
{
v=new Vector();
}
C(int i)
{
}
public void someMethod()
{
System.out.println(v.isEmpty());
}
}
compile time error
runtime exception
the code compiles and runs fine
none of the above
Explanation:
No Explanation Available
Ans: 1
23)
class C1{
public void m1(){ // 1
}
}
class C2 extends C1{ //2
private void m1(){
}
}
compile time error at line1
compile time error at line2
Runtime exception
None of the above
Explanation:
tending to assign weaker access not allowed
Ans: 2
24)
interface I{
int
i;
// line 1
}
class C implements I{
public static void main(String a[]){
System.out.println(i);
System.out.println(i++); //line 2
}
}
compile time error at line 1,2
compile time error at line 2
Runtime exception
Noneofthe above
Explanation:
interface constants are final so,they must be initialized when
declaring it and they can not be altered
Ans: 1
25)
An abstract class must have at least one abstract method
true
true
Explanation:
An abstract without abstract methods is allowed
Ans: 2
26)
<![CDATA[
class C {
public static void main(String[] args) {
boolean b1;
b1=3<4<5;
//1
System.out.println(b1); //2
}}
]]>
compile time error at line 1
compile time error at line 2
Runtime exception
None of the above
Explanation:
<![CDATA[
3<4<5 evaulates to true<5 -->it's a wrong expression so it
results in compiletime error
]]>
Ans: 1
27)
class C{
public static void main(String[] args) {
try
{
int i1=3/0;
}
catch(Exception e)
{
System.out.println("exception1");
}
catch(NullPointerException e)
{
System.out.println("exception2");
}
finally
{
System.out.println("finally");
}
}}
compile time error
runtime exception
prints exception1 and finally
prints exception1,exception2 and finally
None of the above
Explanation:
No Explanation Available
Ans: 1
28)
class C {
public static void main(String[] args) {
char c1=65;
switch(c1){
case
'A':
System.out.println("one");
default:
System.out.println("two");
case
'b':
System.out.println("three");
}}}
prints one twot hree
prints two three
compile time error
Runtime exception
None of the above
Explanation:
char is a legal value for switch clause
Ans: 1
29)
class c1{
void go(){}
}
class c2 extends c1
{
String go()
{
return null;
}
}
compile time error
runtime exceptione
the code compiles and runs fine
None of the above
Explanation:
No Explanation Available
Ans: 1
30)
class base
{
base(int c)
{
System.out.println("base");
}
}
class Super extends base
{
Super()
{
System.out.println("super");
}
public static void main(String [] a)
{
base b1=new Super();
}
}
compile time error
runtime exceptione
the code compiles and runs fine
None of the above
Explanation:
No Explanation Available
Ans: 1
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