Java Online Test

1. Which of the following method of Process class can terminate a process?

2. Which method can be used to check fileAccessiblity?

3. What will be the output of the following Java program?

 
    class A
   {
       public int i;
       public int j;
       A()
       {
           i = 1;
           j = 2;
	}
   }   
   class B extends A
   {
       int a;
       B()
       {
           super();
       }
   }   
   class super_use
   {
       public static void main(String args[])
       {
           B obj = new B();
           System.out.println(obj.i + " " + obj.j);  
       }
  }

4. What will be the output of the following Java program?

 
    import java.net.*;
    class networking 
    {
        public static void main(String[] args) throws UnknownHostException 
        {
            InetAddress obj1 = InetAddress.getByName("cisco.com");
            System.out.print(obj1.getHostName());
        }
    }

5. Which of these methods is used to compare a specific region inside a string with another specific region in another string?

6. Which of these exceptions handles the divide by zero error?

7. Which of these data type cannot be type parameterized?

8. Which of the following is not a JDBC connection isolation levels?

9. What will be the output of the following Java program?

 
    class A 
    {
        int i;
        public void display() 
        {
            System.out.println(i);
        }    
    }    
    class B extends A 
   {
        int j;
        public void display() 
        {
            System.out.println(j);
        } 
    }    
    class Dynamic_dispatch 
   {
        public static void main(String args[])
        {
            B obj2 = new B();
            obj2.i = 1;
            obj2.j = 2;
            A r;
            r = obj2;
            r.display();     
        }
   }

10. What is an event in delegation event model used by Java programming language?

11. What will be the output of the following Java code?

 
    import java.util.*;
    class stack 
    {
        public static void main(String args[]) 
        {
            Stack obj = new Stack();
            obj.push(new Integer(3));
            obj.push(new Integer(2));
            obj.pop();
            obj.push(new Integer(5));
     	    System.out.println(obj);
        }
    }

12. Which of these class contains the methods used to write in a file?

13. Which of these package is used for graphical user interface?

14. What will be the output of the following Java program?

    class string_demo 
    {
        public static void main(String args[])
        {
            String obj = "I" + "like" + "Java";   
            System.out.println(obj);     
        }
   }

15. Which of these methods can be used to writing console output?

16. What will be the output of the following Java program?

    class rightshift_operator 
    {
        public static void main(String args[]) 
        {    
             int x; 
             x = 10;
             x = x >> 1;
             System.out.println(x);
        } 
    }

17. Which of these is used to perform all input & output operations in Java?

18. What will be the output of the following Java code?

 
    class newthread implements Runnable
    {
	Thread t;
	newthread()
        {
	    t = new Thread(this,"My Thread");
	    t.start();
	}
    }
    class multithreaded_programing
    {
        public static void main(String args[])
        {
            new newthread();        
        }
    }

19. What should be expression1 evaluate to in using ternary operator as in this line?

 expression1 ?  expression2  :  expression3 

20. Which of these methods return string equivalent of Boolean object?

21. What will be the output of the following Java program?

 
    import java.util.*;
    class Linkedlist 
    {
        public static void main(String args[]) 
        {
            LinkedList obj = new LinkedList();
            obj.add("A");
            obj.add("B");
            obj.add("C");
            obj.removeFirst();
            System.out.println(obj);
        }
    }

22. What will be the output of the following Java code?

    class Output 
    {
        public static void main(String args[]) 
        {    
             boolean a = true;
             boolean b = false;
             boolean c = a ^ b;
             System.out.println(!c);
        } 
    }

23. What exception thrown by parseInt() method?

24. Which of the following is not introduced with Java 8?

25. How can we take input text from user in HTML page?

26. Which of these methods is used to get x coordinate of the mouse?

27. How to specify autowiring by name?

28. Which of these Exceptions is thrown by remote method?

29. What will be the output of the following Java program?

    class main_class 
    {
        public static void main(String args[])
        {
            int x = 9;
            if (x == 9) 
            { 
                int x = 8;
                System.out.println(x);
            }
        } 
    }

30. Which of this class can be used to format dates and times?

31. Which of these is a super class of wrappers Double and Float?

32. What will be the output of the following Java program?

 
    class Output 
    {
         public static void main(String args[])
         {
             char a[] = {'a', '5', 'A', ' '};   
             System.out.print(Character.isDigit(a[0])+ " ");
             System.out.print(Character.isWhitespace(a[3])+ " ");
             System.out.print(Character.isUpperCase(a[2]));
        }
    }

33. What is true about threading?

34. Which of these methods returns the class of an object?

35. What is true about do statement?

36. What will be the output of the following Java code?

    import java.util.*;
    public class genericstack <E>
    {
        Stack <E> stk = new Stack <E>();
	public void push(E obj)
        {
            stk.push(obj);
	}
	public E pop()
        {
            E obj = stk.pop();
	    return obj;
	}
    }
    class Output
    {
        public static void main(String args[])
        {
            genericstack <String> gs = new genericstack<String>();
            gs.push("Hello");
            System.out.print(gs.pop() + " ");
            genericstack <Integer> gs = new genericstack<Integer>();
            gs.push(36);
            System.out.println(gs.pop());
        }
    }

37. Which file separator should be used by MANIFEST file?

38. Which of this keyword must be used to inherit a class?

39. What will be the output of the following Java program?

 class Alligator 
 {
  public static void main(String[] args) 
   {
   int []x[] = {{1,2}, {3,4,5}, {6,7,8,9}};
   int [][]y = x;
   System.out.println(y[2][1]);
   }
 }

40. What will be the output of the following Java code?

 
    enum Season 
    {
        WINTER, SPRING, SUMMER, FALL
    };
    System.out.println(Season.WINTER.ordinal());

41. Which of these method of Object class can generate duplicate copy of the object on which it is called?

42. What will be the output of the following Java program?

    class Output 
    {
        public static void main(String args[]) 
        {    
             int a = 5;
             int b = 10;
             first: 
             {
                second: 
                {
                   third: 
                   { 
                       if (a ==  b >> 1)
                           break second;
                   }
                   System.out.println(a);
                }
                System.out.println(b);
             }
        } 
    }

43. Which of this method of class StringBuffer is used to get the length of the sequence of characters?

44. Which of these class is not a member class of java.io package?

45. What is the relation between hashset and hashmap?

46. How does applet and servlet communicate?

47. What will be the output of the following Java program?

    class access
    {
        public int x;
 	static int y;
        void cal(int a, int b)
        {
            x +=  a ;
            y +=  b;
        }        
    }    
    class static_specifier 
    {
        public static void main(String args[])
        {
            access obj1 = new access();
            access obj2 = new access();   
            obj1.x = 0;
            obj1.y = 0;
            obj1.cal(1, 2);
            obj2.x = 0;
            obj2.cal(2, 3);
            System.out.println(obj1.x + " " + obj2.y);     
        }
   }

48. What will be the output of the following Java code snippet?

import java.util.*;
public class Demo
{
    public static void main(String[] args)
    {
        Map<Integer, Object> sampleMap = new TreeMap<Integer, Object>();
        sampleMap.put(1, null);
        sampleMap.put(5, null);
        sampleMap.put(3, null);
        sampleMap.put(2, null);
        sampleMap.put(4, null);
 
        System.out.println(sampleMap);
    }
}

49. Which of these operators is used to allocate memory to array variable in Java?

50. How to read a classpath file?