person,父类
public class Person { public Person(String name){ this.name=name; } PRotected String name; public void sayName(){ System.out.println("My name is "+this.name); } public void description(){ System.out.println("I am a human"); }}student子类
public class Student extends Person{ public Student(String name){ super(name); } public void description(){ System.out.println("I am a student"); }}调用
public class test { public static void main(String[] args) throws ParseException { Person person=null; Student student=null; student=new Student("jack"); person=(Person)student; person.sayName(); person.description(); }}输出结果 My name is jack I am a student
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