Java program for changeable wrapper class
By: Issac in Java Tutorials on 2009-09-14
In this tutorial we are going to see a changeable wrapper class example. In this example We have file named MainClass.java.. Here we want arraylist, list. So we have to import util package.We can use import java.util.ArrayList; , import java.util.List; in this example..
import java.util.ArrayList;
import java.util.List;
class Values {
private int s;
public Values(int x)
{
s = x;
}
public int getNumber()
{
return s;
}
public void setNumber(int s)
{
this.s = s;
}
public void increment()
{
s++;
}
public String toString()
{
return Integer.toString(s);
}
}
public class MainClass
{
public static void main(String[] args)
{
List list = new ArrayList();
for (int i = 0; i < 10; i++)
list.add(new Values(i));
System.out.println(list);
for (int i = 0; i < list.size(); i++)
((Values) list.get(i)).increment();
System.out.println(list);
}
}
Output:
[0,1,2,3,4,5,6,7,8,9]
[1,2,3,4,5,6,7,8,9,10]
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