protecteddemo.java

java入门经典教程 java入门经典教程 java入门经典教程

// 例2.2.3  ProtectedDemo.java
class Person
{
    private String name; 
    private int age;
    public Person(String name,int age)
{   
        this.name = name;
        this.age = age;
    }
    protected void getInfo() // getInfo的访问权限是protected的
{   
        System.out.print("This person's name is "+name+", age is "+age);
    }
}
class Teacher extends Person
{   
    public Teacher(String name,int age)
{
        super(name,age); 
    }
    public void teach()
{
        getInfo();  // 可以访问getInfo()，因为它是受保护的
        System.out.println(", is a teacher!");
    }
}
public class ProtectedDemo
{
    public static void main(String args[])
{
        Person p = new Person("David",40);   
        p.getInfo();
        System.out.println();   

        Teacher t = new Teacher("Lisa",35);  
        t.teach(); 
    }
}