Mock java Questions set - 3

Sun Certified Java Programmer(SCJP 1.4)

MockQuestions - 20
Mock Exam - 3
Q1
public class Test1{
public static void main(String args[]){
System.out.println(method());
}
public static int method(){
try{
return 1;
}
catch(Exception e){
return 2;
}
finally{
return 3;
}
}
}
What will be the output?
A1 1
A2 2
A3 3
A4 0
Q2
public class Test2{
public static void main(String args[]){
System.out.println(method());
}
public static int method(){
try{
throw new Exception();
return 1;
}
catch(Exception e){
return 2;
}
finally{
return 3;
}
}
}
What will be the output?
1
A1 2
A2 3
A3 4
A4 Compiler error
Q3
public class Test3{
public static void main(String args[]){
System.out.println(method());
}
public static int method(){
try{
throw new Exception();
}
catch(Exception e){
throw new Exception();
}
finally{
return 3;
}
}
}
What will be the output?
A1 3
A2 0
A3 Runtime Exception
A4 Compiler error
Q4
public class Test4{
public static void main(String args[]){
System.out.println(method());
}
public static int method(){
return;
}
}
What will be the output?
A1 null
A2 0
A3 Runtime exception
A4 Compiler error
Q5
import java.io.IOException;
public class Test5{
public static void main(String args[]){
try{
throw new IOException();
}
catch(Exception e){
System.out.println("Excepion");
}
catch(IOException e){
System.out.println("IOExcepion");
}
}
}
What will be the output?
A1 Exception
A2 IOException
A3 Exception IOException
A4 Compilers error
Q6
public class Test6{
public static void main(String args[]) throws Exception{
try{
throw new Exception();
}
finally{
System.out.println("No Error");
}
}
}
What will be the output?
A1 No Error followed by java.lang.Exception
A2 java.lang.Exception followed by No Error
A3 No Error
A4 Compiler Error
Q7
ublic class Test7{
public static void main(String args[]) throws Exception{
Test7 t = new Test7();
t.method();
System.out.println("Print");
}
public void method()throws Exception{
throw new Exception();
}
}
What will be the output?
A1 Print
A2 Exception thrown at runtime
A3 no output
A4 Compiler Error
Q8
public class Test8{
public static void main(String args[]) throws Exception{
Test8 t = new Test8();
t.method();
System.out.println("Print");
}
public void method(){
try{
throw new Exception();
}catch(Exception e){}
}
}
What will be the output?
A1 Print
A2 Exception thrown at runtime
A3 no output
A4 Compiler Error
Q9
public class Test9 extends A{
public static void main(String args[]) throws Exception{
Test9 t = new Test9();
}
}
class A{
A() throws Exception{
System.out.println("A Class");
}
}
What will be the output?
A1 A Class
A2 Runtimxception
A3 no output
A4 Compiler Error
Q10
public class Test10 extends A{
Test10()throws Exception{
System.out.println("Test10 Class");
}
public static void main(String args[]) throws Exception{
Test10 t = new Test10();
}
}
class A{
A() throws Exception{
System.out.println("A Class");
}
}
What will be the output?
A1 A Class Test10 Class
A2 Runtimxception
A3 no output
A4 Compiler Error
public class Test11 extends A{
Test11()throws Exception{
System.out.println("Test10 Class");
}
Test11(int i){}
public static void main(String args[]) throws Exception{
Q11
Test11 t = new Test11();
}
}
class A{
A() throws Exception{
System.out.println("A Class");
}
}
What will be the output?
A1 A Class Test10 Class
A2 Runtimxception
A3 no output
A4 Compiler Error
Q12
import java.io.IOException;
public class Test12 extends A{
public void method() throws Exception{
System.out.println("Subclass");
}
public static void main(String args[]) throws Exception{
A a = new A();
a.method();
a = new Test12();
a.method();
}
}
class A{
public void method() throws IOException{
System.out.println("Superclass");
}
}
What will be the output?
A1 Subclass Superclass
A2 Runtimxception
A3 Superclass Superclass
A4 Compiler Error
Q13 What are the legal arguments types for switch?
A1 int
A2 byte
A3 char
A4 All the above.
Q14 Which of the following are valif if constructs?
A1 if(2>3){}
A2 if(false){}
A3 if(false){}
A4 if(true)
Q15
public class Test15{
public static void main(String args[]) throws Exception{
for (int i = 0;i < 3;i++){
for (int j = 0;j < 3;j++){
System.out.print(i);
System.out.print(j+",");
break;
}
}
}
}
What will be the output?
A1 00,
A2 00,10,20,
A3 000102
A4 None of the above
Q16
public class Test16 extends A{
Test16(){
System.out.println("Sub");
}
public static void main(String args[]) {
Test16 t = new test16();
}
}
class A{
A(int i){
System.out.println("Super");
}
}
What will be the output?
A1 Super Sub
A2 Super
A3 Sub
A4 Compiler Error
Q17
public class Test17 extends A{
Test17(int i){
System.out.println(i);
super(2);
}
public static void main(String args[]) {
Test17 t = new Test17(5);
}
}
class A{
A(int i){
System.out.println(i);
}
}
What will be the output?
A1 5 2
A2 2 5
A3 5 5
A4 Compiler error
Q18
public class Test18 {
Test18(){
this(7);
}
Test18(int i){
this(1.0);
Test18(i);
}
Test18(float f){
System.out.println(f * 2);
}
Test18(double d){
System.out.println(d * 3);
}
void Test18(int i){
System.out.println(i);
}
public static void main(String args[]) {
Test18 t = new Test18();
}
}
What will be the output?
A1 3.0 7
A2 2.0 7
A3 7 3.0
A4 Compiler Error
Q19
public class Test19 {
float f;
Test19(){
this(f);
f = 3;
}
Test19(float f){
System.out.println(f);
}
public static void main(String args[]) {
Test19 t = new Test19();
}
}
What will be the output?
A1 0.0
A2 0
A3 3
A4 Compiler error
public class Test20 extends A{
Q20
Test20(){
this("Hi");
}
Test20(String str){
System.out.println(str);
}
public static void main(String args[]) {
Test20 t = new Test20();
}
}
class A{
A(){
System.out.println("Super");
}
}
What will be the output?
A1 Super Hi
A2 Hi Super
A3 Super
A4 Compiler Error
Q21
public class Test21{
public static void main(String args[]) {
Test21 t;
t.method();
}
public static void method(){
System.out.println("NullPointerException");
}
}
What will be the output?
A1 Nothing is printed.
A2 RuntimeException
A3 NullPointerException
A4 Compiler Error
Q22
public class Test22{
public static void main(String args[]) {
Test22 t = null;
t.method();
}
public static void method(){
System.out.println("NullPointerException");
}
}
What will be the output?
A1 Nothing is printed.
A2 RuntimeException
A3 NullPointerException
A4 Compiler Error
Q23 Which of the following modifiers are allowed in constructor?
A1 private
A2 default
A3 public
A4 static
Q24 Which of the following modifiers are allowed for top-level classes?
A1 private
A2 static
A3 public
A4 strictfp
Q25 which one of the keyword cannot be used with instance variables?
A1 transient
A2 volatile
A3 synchronized
A4 abstract
Answers
1 3
2 Compiler Error
3 Compiler Error
4 Compiler Error
5 Compiler Error
6 No Error followed by java.lang.Exception
7 Exception thrown at runtime
8 Print
9 Compiler Error
10 A Class Test10 Class
11 Compiler Error
12 Compiler Error
13 All the above
14
if(2>3){}
if(false){}
if(true){}
15 00,10,20,
16 Compiler Error
17 Compiler Error
18 3.0 7
19 Compiler Error
20 Super Hi
21 Compiler Error
22 NullPointerException
23
private
public
24
strictfp
public
25
synchronized
abstrct
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