Short-answer Questions for JAVA

1. What will be the output of the following code?
byte x = 64, y;
y = (byte) (x << 2);
System.out.println(y);

2. What will be the output of the following code:
byte b;
double d = 417.35;
b = (byte) d;
System.out.println(b);

3. Given the value of a variable, write a statement,
without using if construct, which will produce the
absolute value of the variable.

4. What is wrong with the following code?
switch(x)
{
case 1:
n1 = 10;
n2 = 20;
case 2:
n3 = 30;
break;
n4 = 40;
}

5. What will be the output of the following program
code?
int m = 100;
int n = 300;
while (++m < — —n);
System.out.println(m);

6. What does the following fragment display
String s = “six:” + 3 + 3;
System.out.println(s);

7. What is the output of the following code?
String s;
System.out.println(“s = ” + s);

8. What is the output of the following code?
String s = new String( );
System.out.println(“s = ” + s);

9. What is the problem with the following snippet?
class Q
{
public static void main(String args[ ])
{
int i = 5, j = 10;
if ((i<=j)||(i=10));
System.out.println(“OK”);
System.out.println(“NOT OK”);
}
}

10. What will be the output of the following code
snippet?
int x = 10;
int y = 20;
if ((x10)
System.out.println(x);
else
System.out.println(y

11. Show the output the following code:
int a, b;
a = 5;
b = 10;
if(a > 5)
if(b > 5)
{
System.out.println(“b is ” + b);
}
else
System.out.println(“a is ” + a);

12. State the output of the following code:
int a = 10;
int b = 5;
if(a > b)
{
if(b > 5)
System.out.println(“b is ” + b);
}
else
System.out.println(“a is” + a);

13. Give the output of the following code:
int m = 100;
while(true)
{
if(m < 10)
break;
m = m — 10;
}
Systm.out.println(“m is ” + m);

14. Give the output of the following code:
int m = 100;
while(true)
{
if(m < 10)
continue;
m = m — 10;
}
System.out.println(“m is ” + m);

15. Using a single line of code, complete the following
class so that it returns x+y if the value of x is
equal to y, otherwise returns 0:
public class XY
{
public return int fun(int x, int y)
{
.......... (one line code her)
}
}

16. Given a package named EDU.Student, how would
you import a class named Test contained in this
package? Write one line statement.

17. Consider the following class defi nition:
class Student
{
abstract double result( )
}
This code will not compile since a keyword
is missing in the fi rst line.
What is the keyword?

18. Consider the following class fi le?
import java.awt.*;
import java.io.*;
package studentBase;
class Test
{
void display( )
{
System.out.println(“RESULTS”);
}
}
Will it compile? YES or NO. Give reason, if No:

19. Consider the following code:
class Product
{
public static void main(String args [ ])
{
int x = 10, y = 20;
System.out.println(mu1 (x, y));
}
int mul(int a, int b)
{
return(a * b);
}
}
Will it compile? YES or NO. Give reason, if No:

20. Given below are two fi les:
File Employee.java
package purchase;
public class Employee
{
protected double age = 35.00;
}
File Company.java
import purchase.Employee;
public class Company
{
public static void main(String arg[ ])
{
Employee e = new Employee( );
System.out.println(“Age = ”+e.age);
}
}
Will the fi le Company.java compile? YES or NO.
Give reason, if No.

21. Consider the following code:
class A
{
void method(int x)
{
System.out.println(“x = ” + x); }
}
class B extends A
{
void method(int y)
{
System.out.println(“y = ” + y);
}
void method(String s)
{
System.out.println(“s = ” + s);
}
public static void main(String args[ ])
{
A a1 = new A( ); A a2 = new B( );
a1.method(10);
a2.method(20);
}
}
What will be the output, when executed?

22. There are three classes that implement and
DataInput and DataOutput interfaces. Two of them
are  DataInputStream and DataOutputStream.
Which is the third one?

23. What output will the following program produce?
class Bits
{
public static void main(String args[ ])
{
short s1 = 3; // 0000 0011
short s2 = 13; // 0000 1101
s1 = (short) (s1 ^ s2);
System.out.println(“Result is”+s1);
}
}

24. State the output of the following program:
class Condition
{
public static void main(String args[ ])
{
int x = 10;
int y = 15;
System.out.println((x>y)?3.14:3));
}
}

25. Which of the classes in java.io package defines a
method to delete a fi le?

26. Given a valid File object reference, we can create
a new fi le using two classes defi ned in java.io
package. One is FileOutputStream class. Which is
the other one?

27. If raf is an instance of RandomAccessFile, how can
we move the fi le pointer to the end of the fi le?
Write the statement

28. What will be the output of the following program
when it is executed with the command line
java Command Java is wonderful
class Command
{
     public staitic void main(String args[ ])
     {
for(int i = 1; i < args.length; i++)
{
System.out.print(args[i]);
if( i != args.length )
{
System.out.print(“ ”);
}System.out.println(“ ”);
}
}

29. What will be the output of the following code
snippet when combined with suitable
declarations and run?
StringBuffer city = new StringBuffer(“Madras”);
StringBuffer string = new StringBuffer( );
string.append(new String(city));
string.insert(0, “Central ”);
String.out.println(string);

30. Consider the following program code:
class Thread1 extends Thread
{
public void run( )
{
System.out.println(“Begin”);
suspend( );
resume( );
System.out.println(“End”);
}
}
class ThreadTest
{
public static void main(String args[ ])
{
Thread1 T1 = new Thread1( );
T1.start( );
}
}
On execution, what will be the output?

31. Consider the following application:
class Max
{
public static void main(String args[ ])
{
int max = 10;
max(max, 20, 30);
System.out.println(max);
}
static void max(int max, int x1, int x2)
{
if(x1 > x2)
max = x1;
else
max = x2;
}
}
What value is printed out, when executed?

32. State the output of the following program:
class Recur
{
public static void main(String args[ ])
{
int Result = result(10);
    System.out.println(“Result = ”+Result);
}
static int result(int m)
{
if (m <= 2)
return m;
else
return m + result(m—2);
}
}

33. Consider the class defi nition:
class Default
{
public static void main(String args[ ])
{
int m;
System.out.println(“m is ” + m);
}
}
Will this code compile? YES or NO. Give reason, if
No.

34. What is the output of the following program?
class Static
{
static int m = 0;
static int n = 0;
public static void main(String args[ ])
{
int m = 10;
int x = 20;
{
int n = 30;
System.out.println(“m+n=”+m+n);
}
x = m + n;
System.out.println(“x = ” + x);
}
}

35      Consider the following class defi nitions:
class Square
{
private square( ) { }int area(int side)
{
return(side * side);
}
}
class Constructor
{
public static void main(String args[ ])
{
Square S1 = new Square( );
int area = S1.area(10);
System.out.println(area);
}
}
Will the code above compile and run successfully.
YES or NO. Give reason, if No.

36. Write a statement to draw a rounded rectangle with
the following features:
width = 200
height = 100
corner horizontal diameter = 20
corner vertical diameter = 40
Select a suitable upper-left corner of the
rectangle

37. Which line of the following HTML fi le contains
an error?
1. < applet
2. WIDTH = 400 HEIGHT = 200
3. CODE = HelloJava.Class >
4. < param
5. NAME = “string”
6. VALUE = “Hello” >

38. Give the output of the following program:
class MainString
{
public static void main(String args[ ])
{
       StringBuffer s = new StringBuffer(“String”);
if(s.length()>5) &&
(s.append(“Buffer”).equals(“X”);
// empty statement
System.out.println(s);
}
}

39. What is the range of the value that can be
assigned to a variable of type long?

40. Consider the following program :
class Number
{
int x;
void store(Number num)
{
num.x++;
}
}
class MainNumber
{
public static void main(String args[ ])
{
Number n = new Number( );
n.x = 10;
n.store(n);
System.out.println(n.x);
}
}
What is the output?

41. Given the code:
class Continue
{
public static void main(String args[ ])
{
int m = 0;
loop1: for(int i=0; i<10; i++)
loop2: for(int j=0;j<10;j++)
loop3: for(int k=0;k<10;k++)
{
System.out.println(++m);
if( (k%10) == 0)
continue loop2;
}
}
}
What is the last value printed?

42. Can an abstract method by declared fi nal? YES or
NO. If NO, give reason.

43. Can an abstract method be declared static? YES or
NO. If NO, give reason.

44. Consider the following try ... catch block:
class TryCatch
{
     public static void main(String args[ ])
     {
try
{
double x = 0.0;
   throw(new Exception(“Thrown”));
return;
}
catch(Exception e)
{
    System.out.println(“Exception caught”);
return;
}
fi nally
{
   System.out.println(“fi nally”);
}
     }
    
}
What will be the output?

45. Write a statement that would construct a 20 point
bold Helvetica font.