package Test;

public class TestExtends {

public static void main(String[] args) {

PersonB b = new PersonB();

System.out.println("============="+b.getName());

//PersonA a = new PersonA();

PersonA a = new PersonA("aaa");

//b.getName2("ddddd");

System.out.println("111111111111111"+a.getName());

}

}

class PersonA {

private String name;

        //public  static String name;加static可以使子类对父类的成员进行修改

public PersonA() {

System.out.println(getName());

}

public PersonA(String name) {

this.name = name;

System.out.println(getName());

}

public String getName() {

return name;

}

}

class PersonB extends PersonA {

public PersonB() {

// super();

super("小黑");

}

}

小结：
-运行结果--------------------------------------

小黑

=============小黑

aaa

111111111111111aaa