//: appendixa:MutableInteger.java
// A changeable wrapper class.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import com.bruceeckel.simpletest.*;
import java.util.*;

class IntValue {
  private int n;
  public IntValue(int x) { n = x; }
  public int getValue() { return n; }
  public void setValue(int n) { this.n = n; }
  public void increment() { n++; }
  public String toString() { return Integer.toString(n); }
}

public class MutableInteger {
  private static Test monitor = new Test();
  public static void main(String[] args) {
    List v = new ArrayList();
    for(int i = 0; i < 10; i++)
      v.add(new IntValue(i));
    System.out.println(v);
    for(int i = 0; i < v.size(); i++)
      ((IntValue)v.get(i)).increment();
    System.out.println(v);
    monitor.expect(new String[] {
      "[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]",
      "[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]"
    });
  }
} ///:~