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InheritTest.java

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package ClassTest;

class Person {

String name = "No name";

public Person(String nm) {

name = nm;

}

}

class Employee extends Person {

String empID = "0000";

public Employee(String id) {

super("rui");

/*

父类构造方法在没有任何构造函数的时候，默认提供一个无参构造函数，当有了其他的构造函数时，默认的无参构造函数消失，

在生成子类实例的过程中，需要向上先生成父类的实例，而此时没有父类无参构造函数，所以调用super() 编译错误，

只能调用super("asd")

*/

empID = id;

}

}

public class InheritTest {

public static void main(String[] args) {

Employee e = new Employee("123");

}

}