26 lines
659 B
Java
26 lines
659 B
Java
//: references/MutableInteger.java
|
|
// A changeable wrapper class.
|
|
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++; }
|
|
@Override
|
|
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);
|
|
}
|
|
} ///:~
|