Java Programming - Practice Questions

Question 1

Which of the following are true about the File class?

a)A File object can be used to access the files in the current directory. 
b)When a File object is created, a corresponding directory or file is created in the local file system. 
c)File objects are used to access files and directories on the local file system. 
d)File objects can be garbage collected.

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Question 2

What output is displayed as the result of executing the following statement?
System.out.println("// Looks like a comment.");

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Question 3

What will be the output of the program?

public class X 
{  
    public static void main(String [] args) 
    {
        try 
        {
            badMethod();  
            System.out.print("A");  
        } 
        catch (RuntimeException ex) /* Line 10 */
        { 
            System.out.print("B"); 
        } 
        catch (Exception ex1) 
        { 
            System.out.print("C"); 
        } 
        finally 
        {
            System.out.print("D"); 
        } 
        System.out.print("E"); 
    } 
    public static void badMethod() 
    { 
        throw new RuntimeException(); 
    } 
}

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Question 4

In order for a source code file, containing the public class Test, to successfully compile, 
which of the following must be true?

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Question 5

What will be the output of the program?

public class RTExcept 
{
    public static void throwit () 
    {
        System.out.print("throwit ");
        throw new RuntimeException();
    }
    public static void main(String [] args) 
    {
        try 
        {
            System.out.print("hello ");
            throwit();
        }
        catch (Exception re ) 
        {
            System.out.print("caught ");
        }
        finally 
        {
            System.out.print("finally ");
        }
        System.out.println("after ");
    }
}

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Question 6

Which of the following declare an array of string objects?
a)String[ ] s; 
b) String [ ]s: 
c)String[ s]: 
d) String s[ ]:

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Question 7

Which one creates an instance of an array?

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Question 8

Which of the following statements are true?

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Question 9

Which three form part of correct array declarations?
1. public int a [ ]
     2. static int [ ] a
     3. public [ ] int a
     4. private int a [3]
     5.private int [3] a [ ]
    6. public final int [ ] a

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Question 10

What will be the output of the program?

public class Test 
{
    public static int y;
    public static void foo(int x) 
    {
        System.out.print("foo ");
        y = x;
    }
    public static int bar(int z) 
    {
        System.out.print("bar ");
        return y = z;
    }
    public static void main(String [] args ) 
    {
        int t = 0;
        assert t > 0 : bar(7);
        assert t > 1 : foo(8); /* Line 18 */
        System.out.println("done ");
    }
}

Accepted Answer