简单实现继承链

分三部分，代码如下：

一部分

package Day07;

public class Employee extends Person {
public Employee() {
this ("(2) Invoke Employee‘s constructor");
System.out.println("(3) Perform Employee‘s task");
}

public Employee(String s) {
System.out.println(s);
}
}

第二部分

package Day07;

public class Faculty extends Employee {
public Faculty() {
System.out.println("(4) Perform Faculty‘s task");
}

public static void main(String[] args) {
new Faculty();
}
}

第三部分

package Day07;

public class Person {
public Person() {
System.out.println("(1) performs Person‘s task");
}
}

新学到的继承链