PersonDemo.java:35: 找不到符号

发布网友发布时间：2023-09-08 20:29

共2个回答

热心网友时间：2024-12-04 18:14

问题主要有2个：
1、ave是方法，不是变量，必须用ave();
2、Person class不包含setDate方法，你定义为Person类，调用时，就只能使用Person及其父类有定义的方法和属性
如：
class Person{
void setDate(double e,double m,double c){
//放一个空方法就好
}
}

热心网友时间：2024-12-04 18:14

class Person {

String name, sex, city;
int age;

Person(String n, String s, String c, int a) {
name = n;
sex = s;
city = c;
age = a;
}

void showInfor() {
System.out.println(name + "\t" + age + "\t" + sex + "\t" + city);
}
}

class Student extends Person {

int num;
double english, maths, computer;
String dept;

Student(String n, String s, String c, String dept, int num, int a) {
super(n, s, c, a);
this.num = num;
this.dept = dept;
}

void setDate(double e, double m, double c) {
english = e;
maths = m;
computer = c;
}

double ave() {
double ave = (english + maths + computer) / 3.0;
return ave;
}

void showInfor() {
super.showInfor();
System.out.print("the Student\t" + name + "\t");
System.out.print(num + "\t" + dept);
System.out.print(english + "\t" + maths + "\t" + computer + "\t" + ave());
}
}

class Teacher extends Person {

int wage;
String lab;

Teacher(String n, String s, String c, String lab, int wage, int a) {
super(n, s, c, a);
this.wage = wage;
this.lab = lab;
}

void showInfor() {
super.showInfor();
System.out.print("the Teacher\t" + name + "\t");
System.out.print(wage + "\t" + lab);
}
}

class PersonDemo {

public static void main(String args[]) {
Person a;
a = new Student("小飞", "男", "成都", "数学系", 2006061038, 20);
((Student) a).setDate(96.0, 98.0, 88.0);
a.showInfor();
Teacher b = new Teacher("刘易", "男", "成都", "数学实验室", 3600, 43);
b.showInfor();
}
}
错误如楼上所说，我把你错的都改了。最后鄙视一楼的。完毕