Collections Framework In Java - Study Mode
[#126] What will be the output of the following Java program? import java.util.*
class Bitset
{
public static void main(String args[])
{
BitSet obj = new BitSet(5)
for (int i = 0
i < 5
++i)
obj.set(i)
obj.clear(2)
System.out.print(obj)
}
}
Correct Answer
(A) {0, 1, 3, 4}
[#127] What will be the output of the following Java program? import java.util.*
class Collection_Algos
{
public static void main(String args[])
{
LinkedList list = new LinkedList()
list.add(new Integer(2))
list.add(new Integer(8))
list.add(new Integer(5))
list.add(new Integer(1))
Iterator i = list.iterator()
while(i.hasNext())
System.out.print(i.next() + " ")
}
}
Correct Answer
(A) 2 8 5 1
[#128] What will be the output of the following Java program? import java.util.*
class Collection_iterators
{
public static void main(String args[])
{
LinkedList list = new LinkedList()
list.add(new Integer(2))
list.add(new Integer(8))
list.add(new Integer(5))
list.add(new Integer(1))
Iterator i = list.iterator()
Collections.reverse(list)
Collections.sort(list)
while(i.hasNext())
System.out.print(i.next() + " ")
}
}
Correct Answer
(C) 1 2 5 8
[#129] What will be the output of the following Java program? import java.util.*
class Output
{
public static void main(String args[])
{
HashSet obj = new HashSet()
obj.add("A")
obj.add("B")
obj.add("C")
System.out.println(obj + " " + obj.size())
}
}
Correct Answer
(B) [A, B, C] 3
[#130] What will be the output of the following Java code? import java.lang.reflect.*
class Additional_packages
{
public static void main(String args[])
{
try
{
Class c = Class.forName("java.awt.Dimension")
Constructor constructors[] = c.getConstructors()
for (int i = 0
i < constructors.length
i++)
System.out.println(constructors[i])
}
catch (Exception e)
{
System.out.print("Exception")
}
}
}
Correct Answer
(A) Program prints all the constructors of 'java.awt.Dimension' package