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collection.java

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+import java.util.*;
+
+public class collection{
+
+static int id=0;
+
+ArrayList<Student> bscs = new ArrayList<Student>();
+HashMap<Integer,Student> hm= new HashMap<Integer ,Student>();
+HashSet<Student> hs= new HashSet<Student>();
+
+public void add(Student s)
+{
+	bscs.add(s);
+	System.out.println("Student Added in ArrayList ");
+
+	hm.put(id++,s);
+	System.out.println("Student Added in HashMap ");
+	hs.add(s);
+	System.out.println("Student Added in HashSet ");
+
+}
+
+public void get(int index)
+{
+	System.out.println("Getting from arraylist...");
+	bscs.get(index).displayStudentDetails();
+	System.out.println("Getting from HasMap...");
+	hm.get(index).displayStudentDetails();
+	System.out.println("Getting from HashSet...");
+
+}
+
+
+public void printSize()
+{
+	System.out.println("Size of ArrayList is : "+ bscs.size());
+	System.out.println("Size of HashMap is : "+ hm.size());
+	System.out.println("Size of HashSet is : "+ hs.size());
+
+}
+
+
+
+public void arraylistIterator()
+{
+
+	System.out.println("Iterating through Array list");
+	Iterator<Student> pointer = bscs.iterator();
+	while(pointer.hasNext())
+		pointer.next().displayStudentDetails();
+
+}
+
+
+
+
+public void hashSetIterator()
+{
+
+	System.out.println("Iterating through Set");
+	Iterator<Student> pointer = hs.iterator();
+	while(pointer.hasNext())
+		pointer.next().displayStudentDetails();
+
+}
+
+public void hashMapIterator()
+{
+
+	System.out.println("Iterating through Map");
+	Iterator<Map.Entry<Integer,Student>> pointer = hm.entrySet().iterator();
+	while(pointer.hasNext())
+	{
+				pointer.next().getValue().displayStudentDetails();
+	}
+}
+
+
+
+
+public static void main(String args[])
+{
+	collection a = new collection();
+
+a.add(new Student("name","fatherName","address",10));
+a.get(0);
+a.printSize();
+a.arraylistIterator();
+a.hashSetIterator();
+a.hashMapIterator();	
+}
+
+
+}