import java.util.Scanner;
public class helloworld2 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scanner = new Scanner(System.in);
int n,total = 0;
String name;
System.out.println("Enter the number of expenses:");
n = scanner.nextInt();
StringBuilder sBuilder = new StringBuilder();
for(int i = 0; i < n; i++){
System.out.println("Expense Name:");
name = scanner.next();
System.out.println("Enter Cost: ");
int cost = scanner.nextInt();
total += cost;
sBuilder.append("\nExpense Name:" + name + " Cost: " + cost);
}
System.out.println(sBuilder.toString() + "\nTotal Cost:" + total);
System.exit(0);
}
}
这是我算的一个工资计算的JAVA程序。
现在有个问题：我输入相同的名字，它是分开显示的，而不是加在一起。
举个例子：比如说我输入两次人名叫Tom的人以及其工资，程序会显示两次Tom,而不是将其合并。
请问如何解决这个问题？
谢谢各位！
------解决方案--------------------
ＬＺ再试一下。
- Java code
public static void main(String[] args) throws Exception { // TODO Auto-generated method stub Scanner scanner = new Scanner(System.in); int n, total = 0; String name; System.out.println("Enter the number of expenses:"); n = scanner.nextInt(); StringBuilder sBuilder = new StringBuilder(); List<String> lst = new ArrayList<String>(); for (int i = 0; i < n; i++) { System.out.println("Expense Name:"); name = scanner.next(); System.out.println("Enter Cost: "); int cost = scanner.nextInt(); total += cost; if ( !lst.contains(name)){ lst.add(name); sBuilder.append("\nExpense Name:" + name + " Cost: " + cost); } else { continue; } } System.out.println(sBuilder.toString() + "\nTotal Cost:" + total); System.exit(0); }
------解决方案--------------------
- Java code
import java.util.HashMap;import java.util.Map;import java.util.Scanner;public class helloworld2 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner scanner = new Scanner(System.in); int n, total = 0; String name; System.out.println("Enter the number of expenses:"); n = scanner.nextInt(); Map<String, Integer> costMap = new HashMap<String, Integer>(); for (int i = 0; i < n; i++) { System.out.println("Expense Name:"); name = scanner.next(); System.out.println("Enter Cost: "); int cost = scanner.nextInt(); if (costMap.containsKey(name)) { costMap.put(name, costMap.get(name) + cost); } else { costMap.put(name, cost); } } for (String key : costMap.keySet()) { System.out.println("Expense Name:" + key + " Cost: " + costMap.get(key)); total += costMap.get(key); } System.out.println("Total Cost:" + total); System.exit(0); }}