51. Which of these interface declares core method that all collections will have?
52. What is the difference between TreeSet and SortedSet?
53. Map implements collection interface?
54. 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");
Field fields[] = c.getFields();
for (int i = 0; i < fields.length; i++)
System.out.println(fields[i]);
}
catch (Exception e)
{
System.out.print("Exception");
}
}
}
import java.lang.reflect.*;
class Additional_packages
{
public static void main(String args[])
{
try
{
Class c = Class.forName("java.awt.Dimension");
Field fields[] = c.getFields();
for (int i = 0; i < fields.length; i++)
System.out.println(fields[i]);
}
catch (Exception e)
{
System.out.print("Exception");
}
}
}55. 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();
Collections.reverse(list);
Collections.shuffle(list);
while(i.hasNext())
System.out.print(i.next() + " ");
}
}
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();
Collections.reverse(list);
Collections.shuffle(list);
while(i.hasNext())
System.out.print(i.next() + " ");
}
}56. What will be the output of the following Java code?
import java.util.*;
class vector
{
public static void main(String args[])
{
Vector obj = new Vector(4,2);
obj.addElement(new Integer(3));
obj.addElement(new Integer(2));
obj.addElement(new Integer(6));
obj.insertElementAt(new Integer(8), 2);
System.out.println(obj);
}
}
import java.util.*;
class vector
{
public static void main(String args[])
{
Vector obj = new Vector(4,2);
obj.addElement(new Integer(3));
obj.addElement(new Integer(2));
obj.addElement(new Integer(6));
obj.insertElementAt(new Integer(8), 2);
System.out.println(obj);
}
}57. Which of these methods sets every element of a List to a specified object?
58. Which of these methods can be used to delete the last element in a LinkedList object?
59. Which of these method is used to add an element to the start of a LinkedList object?
60. What will be the output of the following Java code?
import java.util.*;
class properties
{
public static void main(String args[])
{
Properties obj = new Properties();
obj.put("AB", new Integer(3));
obj.put("BC", new Integer(2));
obj.put("CD", new Integer(8));
System.out.print(obj.keySet());
}
}
import java.util.*;
class properties
{
public static void main(String args[])
{
Properties obj = new Properties();
obj.put("AB", new Integer(3));
obj.put("BC", new Integer(2));
obj.put("CD", new Integer(8));
System.out.print(obj.keySet());
}
}Read More Section(Collections Framework in java)
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