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public class Good {
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String goodname;
double goodprice;
boolean isMem;
public Good(String name,double price){
this.goodname=name;
this.goodprice=price;
this.isMem=false;
}
public void setName(String name){
this.goodname=name;
}
public void setPrice(double price){
this.goodprice=price;
}
public void setMem(){
this.isMem=!this.isMem;
}
public void discount(){
System.out.println(this.goodprice);
}
}
public class Milk extends Good {
double memprice;
public Milk(String name, double price,double memprice) {
super(name, price);
this.memprice=memprice;
// TODO Auto-generated constructor stub
}
public void setMemPrice(double memprice){
this.memprice=memprice;
}
public void discount(){
if(isMem)
System.out.println(this.memprice*0.8);
else
System.out.println(this.goodprice*0.8);
}
public static void main(String args[]){
Milk test=new Milk("牛奶",3,2.6);
test.discount();
test.setMem();
test.discount();
}
}
主要思路；
。创建父类子类你自己看着敲进去，比较简单。
每个函数都要有一个带参数的构造函数；当数组中的参数传入时可以对子类对象初始化。
最后比较排序我是用另一个数组接收原数组元素（对象）中的getWeight() 方法的返回值用于排序，然后在找到对应的值打出来就能达到你要的效果了。
父类：
package playgame;
public abstract class Pet {
private String name;
private int age;
private double weight;
public void getInformation(String name,int age,double weight){
this.name=name;
this.age=age;
this.weight=weight;
}
public double getWeight(){
return weight;
}
public String toString(){
String str="name="+name+",age="+age+",weight"+weight;
return str;
}
public abstract void speak();
public abstract void eat();
}
package playgame;
public class Bird extends Pet{
private String name;
private double weight;
private double flyspeed;
public Bird(String name,double flyspeed,double weight){
this.name=name;
this.flyspeed=flyspeed;
this.weight=weight;
}
public double getWeight(){
return weight;
}
public void speak(){
System.out.println("我是一只小小鸟");
}
public void eat(){
System.out.println("我最爱吃虫子");
}
public String toString(){
String str="name="+name+",flyspeed="+flyspeed+",weight="+weight;
return str;
}
}
package playgame;
public class Cat extends Pet {
private String name;
private String coulour;
private double weight;
public Cat(String name,String coulour,double weight){
this.name=name;
this.coulour=coulour;
this.weight=weight;
}
public double getWeight(){
return weight;
}
public void speak() {
System.out.println("我是一只猫");
}
public void eat() {
System.out.println("我爱吃鱼");
}
public String toString(){
String str="name="+name+",coulour="+coulour+",weight="+weight;
return str;
}
}
package playgame;
public class Dog extends Pet {
private String name;
private double weight;
private String variety;
public Dog(String name,String variety,double weight){
this.name=name;
this.variety=variety;
this.weight=weight;
}
public double getWeight(){
return weight;
}
public void speak() {
System.out.println("我是一只狗");
}
public void eat() {
System.out.println("我爱吃骨头");
}
public String toString(){
String str="name="+name+",weight="+weight+",variety="+variety;
return str;
}
}
package playgame;
import java.util.Arrays;
public class Text1 {
public static void main(String[] args) {
Pet arr[]={new Dog("狗","藏獒",180000.5),new Dog("狗","藏獒",180006.5),
new Cat("猫","红色",18000.5),new Cat("猫","黑色",18000.5),
new Bird("鸟",20.5,180), new Bird("鸟",22.5,187)};
double arr1[]=new double[6];
for(int i=0;i6;i++){
arr1[i]=arr[i].getWeight();
}
Arrays.sort(arr1);
for(int i=0;i6;i++){
for(int j=0;j6;j++){
if(arr1[i]==arr[j].getWeight()){
System.out.println(arr[j].toString()+"\t");
break;
}
}
}
}
}
最后面这个是主函数的类。。请他三个子类在中间，有不明白的地方在追问。
public class WuMingFen {
private String theMa;// 面码
private int quantity;// 粉的分量(两)
private boolean likeSoup;// 是否带汤
// 构造出来的粉对象是酸辣面码、2两、带汤的
public WuMingFen() {
this.theMa = "酸辣";
this.quantity = 2;
this.likeSoup = true;
}
public WuMingFen(String theMa, int quantity) {
this.theMa = theMa;
this.quantity = quantity;
this.likeSoup = true;// 给个默认
}
public WuMingFen(String theMa, int quantity, boolean likeSoup) {
this.theMa = theMa;
this.quantity = quantity;
this.likeSoup = likeSoup;
}
public void check() {
System.out.println("面码:" + this.theMa + "\n分量:" + this.quantity
+ "(两)\n带汤:" + this.likeSoup);
}
public static void main(String[] args) {
WuMingFen f1 = new WuMingFen("牛肉", 3, true);
WuMingFen f2 = new WuMingFen("牛肉", 2);
WuMingFen f3 = new WuMingFen();
f1.check();
f2.check();
f3.check();
}
}