Attr.java

package ch22.ex22_04;

public class Attr
{
    private final String name;
    private Object value = null;

    public Attr(String name)
    {
        this.name = name;
    }

    public Attr(String name, Object value)
    {
        this.name = name;
        this.value = value;
    }

    public String getName()
    {
        return name;
    }

    public Object getValue()
    {
        return value;
    }

    public Object setValue(Object newValue)
    {
        Object oldVal = value;
        value = newValue;
        return oldVal;
    }

    public String toString()
    {
        return name + "='" + value + "'";
    }
}