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// : 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 java.util.ArrayList;
import java.util.List;
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 {
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);
}
} ///:~
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