package com.oreilly.tiger.ch02;
import java.util.ArrayList;
import java.util.List;
public class BadIdea {
private static List<Integer> ints = new ArrayList<Integer>();
public static void fillList(List<Integer> list) {
for (Integer i : list) {
ints.add(i);
}
}
public static void printList() {
for (Integer i : ints) {
System.out.println(i);
}
}
public static void main(String[] args) {
List<Integer> myInts = new ArrayList<Integer>();
myInts.add(1);
myInts.add(2);
myInts.add(3);
System.out.println("Filling list and printing in normal way...");
fillList(myInts);
printList();
try {
List list = (List)BadIdea.class.getDeclaredField("ints").get(null);
list.add("Illegal Value!");
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("Printing with illegal values in list...");
printList();
}
} |