interface CarePet {
public void feed();
public void enjoy();
}class Student implements CarePet {
String name;
Student(String name) {
this.name = name;
}
public void feed() {
System.out.println("学生喂养宠物");
}
public void enjoy() {
System.out.println("宠物很enjoy~~");
}
}class Farmer extends Student implements CarePet {
Farmer(String n) {
super(n);
}
public void feed() {
System.out.println("农民喂养宠物");
}
public void enjoy() {
System.out.println("宠物同时也是食物");
}
}public class Tinterface {
public static void main(String args[]) {
CarePet c1 = new Student("seven");
System.out.println("一个叫" + c1.name + "的");
c1.feed();
c1.enjoy();
System.out.println("==========================================================================");
CarePet c2 = new Farmer("jack");
System.out.println("一个叫" + c2.name + "的");
c2.feed();
c2.enjoy();
}
}E:\java\interface>javac Tinterface.java
Tinterface.java:39: 找不到符号
符号: 变量 name
位置: 接口 CarePet
System.out.println("一个叫" + c1.name + "的");
^
Tinterface.java:44: 找不到符号
符号: 变量 name
位置: 接口 CarePet
System.out.println("一个叫" + c2.name + "的");
^
2 错误
public void feed();
public void enjoy();
}class Student implements CarePet {
String name;
Student(String name) {
this.name = name;
}
public void feed() {
System.out.println("学生喂养宠物");
}
public void enjoy() {
System.out.println("宠物很enjoy~~");
}
}class Farmer extends Student implements CarePet {
Farmer(String n) {
super(n);
}
public void feed() {
System.out.println("农民喂养宠物");
}
public void enjoy() {
System.out.println("宠物同时也是食物");
}
}public class Tinterface {
public static void main(String args[]) {
CarePet c1 = new Student("seven");
System.out.println("一个叫" + c1.name + "的");
c1.feed();
c1.enjoy();
System.out.println("==========================================================================");
CarePet c2 = new Farmer("jack");
System.out.println("一个叫" + c2.name + "的");
c2.feed();
c2.enjoy();
}
}E:\java\interface>javac Tinterface.java
Tinterface.java:39: 找不到符号
符号: 变量 name
位置: 接口 CarePet
System.out.println("一个叫" + c1.name + "的");
^
Tinterface.java:44: 找不到符号
符号: 变量 name
位置: 接口 CarePet
System.out.println("一个叫" + c2.name + "的");
^
2 错误
可以试试强制转换为Student类型.
interface CarePet {
public String getName();
public void feed();
public void enjoy();
}class Student implements CarePet {
String name;
Student(String name) {
this.name = name;
}
public void feed() {
System.out.println("学生喂养宠物");
}
public void enjoy() {
System.out.println("宠物很enjoy~~");
} public String getName() {
return name;
}
}class Farmer extends Student implements CarePet {
Farmer(String n) {
super(n);
}
public void feed() {
System.out.println("农民喂养宠物");
}
public void enjoy() {
System.out.println("宠物同时也是食物");
}
}public class Tinterface {
public static void main(String args[]) {
CarePet c1 = new Student("seven");
System.out.println("一个叫" + c1.getName() + "的");
c1.feed();
c1.enjoy();
System.out.println("==========================================================================");
CarePet c2 = new Farmer("jack");
System.out.println("一个叫" + c2.getName() + "的");
c2.feed();
c2.enjoy();
}
}