disposedemo.java

java入门经典教程 java入门经典教程 java入门经典教程

// 例 2.2.6  DisposeDemo.java
class A
{
    private int i,j;
    public A(int i,int j)
{
        this.i = i;
        this.j = j;
        System.out.println("class A is constructed");
    }
    public void dispose()
{
        System.out.println("class A is disposed");
    }
}
class B extends A
{    
    private int k;
    public B(int i,int j,int k)
{
        super(i,j);   // 必须放在第一行
        this.k = k;
        System.out.println("class B is constructed");
    }
public void dispose()
{
        System.out.println("class B is disposed");
        super.dispose();     // 必须放在最后一行
    }
}
class DisposeDemo
{
    public static void main(String[] args)
{
        B b = new B(10,15,20);  // 创建一个B类的对象
        System.out.println();  
        b.dispose();   // 调用B类对象的清理方法实现清理工作
    }
}