Create Java-collection.java

Author: bhavy217

Java-collection.java

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+// Java program to demonstrate
+// why collection framework was needed
+import java.io.*;
+import java.util.*;
+ 
+class CollectionDemo {
+ 
+    public static void main(String[] args)
+    {
+        // Creating instances of the array,
+        // vector and hashtable
+        int arr[] = new int[] { 1, 2, 3, 4 };
+        Vector<Integer> v = new Vector();
+        Hashtable<Integer, String> h = new Hashtable();
+ 
+        // Adding the elements into the
+        // vector
+        v.addElement(1);
+        v.addElement(2);
+ 
+        // Adding the element into the
+        // hashtable
+        h.put(1, "geeks");
+        h.put(2, "4geeks");
+ 
+        // Array instance creation requires [],
+        // while Vector and hastable require ()
+        // Vector element insertion requires addElement(),
+        // but hashtable element insertion requires put()
+ 
+        // Accessing the first element of the
+        // array, vector and hashtable
+        System.out.println(arr[0]);
+        System.out.println(v.elementAt(0));
+        System.out.println(h.get(1));
+ 
+        // Array elements are accessed using [],
+        // vector elements using elementAt()
+        // and hashtable elements using get()
+    }
+          }