OnJava8-Examples/references/ImmutableInteger.java

//: references/ImmutableInteger.java
// The Integer class cannot be changed.
import java.util.*;

public class ImmutableInteger {
  public static void main(String[] args) {
    List<Integer> v = new ArrayList<>();
    for(int i = 0; i < 10; i++)
      v.add(new Integer(i));
    // But how do you change the int 
    // inside the Integer?
  }
} ///:~