Program: Write an example for Collections.checkedList() method.

Collections.checkedList() method returns a dynamically typesafe view of the specified list. Any attempt to insert an element of the wrong type will result in an immediate ClassCastException. Assuming a list contains no incorrectly typed elements prior to the time a dynamically typesafe view is generated, and that all subsequent access to the list takes place through the view, it is guaranteed that the list cannot contain an incorrectly typed element.

package com.java2novice.collections;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class MyCheckedList {

	public static void main(String a[]){
		
		List myList = new ArrayList();
		myList.add("one");
		myList.add("two");
		myList.add("three");
		myList.add("four");
		List chkList = Collections.checkedList(myList, String.class);
		System.out.println("Checked list content: "+chkList);
		//you can add any type of elements to myList object
		myList.add(10);
		//you cannot add any type of elements to chkList object, doing so
		//throws ClassCastException
		chkList.add(10); //throws ClassCastException
	}
}

Checked list content: [one, two, three, four]
Exception in thread "main" java.lang.ClassCastException: Attempt to insert class java.lang.Integer element into
					collection with element type class java.lang.String
	at java.util.Collections$CheckedCollection.typeCheck(Collections.java:2202)
	at java.util.Collections$CheckedCollection.add(Collections.java:2243)
	at com.java2novice.collections.MyCheckedList.main(MyCheckedList.java:22)