Question

java高手帮我调一下代码

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
public class TestMap {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
Scanner sq = new Scanner(System.in);
Scanner se = new Scanner(System.in);
int e=0;
String []Name=new String[4];
int []Price=new int[4];
int []Number=new int[4];
while(e<=4){
System.out.print("please input the name:"+e);
Name[e] =sc.next();
System.out.print("please input the Price:"+e);
Price[e]=sq.nextInt();
System.out.print("please input the number:"+e);
Number[e]=se.nextInt();
Map<String,Integer,Integer> map = new HashMap<String,Integer,Integer>();
map.put(Name[e],Price[e],Number[e]);
System.out.println(map);
e+=1;
}

public void getSum(){
int t=0;
int sum=0;
while(t<=4){
sum=sum+Price[e]*Number[e];
}
return sum;

}
System.out.print("the total result is:"+sum);

}}

Answer 1

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class TestMap {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
Scanner sq = new Scanner(System.in);
Scanner se = new Scanner(System.in);
int e = 0;
String[] Name = new String[4];
int[] Price = new int[4];
int[] Number = new int[4];
List<Thing> list = new ArrayList<Thing>();
while (e < 4) {
System.out.println("please input the name" + e + ":");
Name[e] = sc.next();
System.out.println("please input the Price" + e + ":");
Price[e] = sq.nextInt();
System.out.println("please input the number" + e + ":");
Number[e] = se.nextInt();
Thing thing = new Thing(Name[e], Price[e], Number[e]);
list.add(thing);
e += 1;
}

double sum = 0;
for (int i = 0; i < list.size(); i++) {
sum += list.get(i).getNumber() * list.get(i).getPrice();
}
System.out.println("the total result is:" + sum);

}}

public class Thing {
private String name;
private double price;
private double number;
public Thing(String name, double price, double number) {
super();
this.name = name;
this.price = price;
this.number = number;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public double getNumber() {
return number;
}
public void setNumber(double number) {
this.number = number;
}

}

Answer 2

我勒个去 map里怎么有三个参数了，map是键值对昌雹的，一个键，一个值，怎么会出来第三个呢，还有你的州模getSum()，怎么可以写在main方法里呢册迅缓，而且你的getSum()方法是无返回值的方法，不能用return的 ，这代码太乱了,调还不如重做，建议看看教程，重做

Answer 3

map是 <key,value> 你写了三个参数

Answer 4

能说一下什么问题吗？