Question

我是HashMaps的新手，我帮助理解了如何在地图中添加和打印整数。然而，不是得到我想要的东西，我得到一些奇怪和不同的东西，我不确定如何解决。

输出

Rick Grimes
Rick Grimes rescued Carl 100pts!
Rick Grimes rescued Carl 100pts!Rick Grimes rescued Michone 50pts!
Characters rescued: Carl, Michone Total points: 10050

您可能会注意到，总分数只是分数的组合。这就是我想要的

渴望输出

Rick Grimes
Rick Grimes rescued Carl 100pts!
Rick Grimes rescued Michone 50pts!
Characters rescued: Carl, Michone Total points: 150

您在我的输出中可能会注意到的另一个问题是line 3重复line 2中的第一次救援，但首先我要关注第一个问题。

这是我的代码

GameDriver.java

import java.io.*;
import java.util.*;
import java.awt.*;

public class GameDriver {

  public static void main(String[] args) throws FileNotFoundException {

         Hero N = new Cop();
         String s;
         File f = new File (args[0]);
         Scanner input = new Scanner(f);
         while (input.hasNext()) {
                s = input.next();
                if (s.equalsIgnoreCase("h")) {
                                               System.out.println(N.getHeroName());
                                             }

                if (s.equalsIgnoreCase("r")) {
                                               String cn = input.next();
                                               int pts = input.nextInt();
                                               N.newMap.put(cn, pts);
                                               System.out.println(N.rescue());

                                             }

                if (s.equalsIgnoreCase("v")) {
                                               System.out.println(N.view());
                                             }
         }

  }
}

总结发生在这个班级

Hero.java

import java.util.*;
import java.io.*;
import java.awt.*;

public abstract class Hero extends Character
{
   private String heroname1;
   public Hero() {
          heroname1 = "Rick Grimes"; //the default player name
   }
   HashMap<String, Integer> newMap = new HashMap<String, Integer>();

   public Hero(String newhero) {
          if (newhero.length() > 0) {
               heroname1 = newhero;
          } else { heroname1 = "Rick Grimes"; } //defaulted as protagonist
   }

   public String getHeroName() {
          return heroname1; //return the name
   }

   public String rescue() { //class to rescue people or things
          String out = "".toString();
          for(String _key : newMap.keySet()) {
              out += heroname1 + " rescued " + _key + " " + newMap.get(_key) +!
          }
          return out;
   }

   public String toString() { //print
          return heroname1;

   }
   public String view() {
          Set<String> names = newMap.keySet();
          StringBuilder sb = new StringBuilder("Characters rescued: ");
          int i = 0;
          for (String name : names) {
              if (i == 0) {
                  sb.append(name);
                  i++;
              } else {
                  sb.append(", ");
                  sb.append(name);
              }
          }

          String printNames = sb.toString();
          Collection<Integer> points = newMap.values();
          StringBuilder sp = new StringBuilder("Total points: ");
          int sum = 0;
          for (Integer value : points) {
               sum += value;
               sp.append(value);
          }
          String printPoints = sp.toString();
          return printNames + " " + printPoints ;
   }
}

我做错了什么？请询问任何澄清！的谢谢！

Answer 1

您只需在此处附加文字：

StringBuilder sp = new StringBuilder("Total points: ");
          int sum = 0;
          for (Integer value : points) {
               sum += value;
               sp.append(value);//you're wrong here.
          }

你应该在变量总和之后附加。

StringBuilder sp = new StringBuilder("Total points: ");
          int sum = 0;
          for (Integer value : points) {
               sum += value;
          }
 sp.append(sum);

附加值也应该是＆＃39; sum＆＃39;不是＆＃39;值＆＃39;;

试图在HashMap中添加整数但不起作用

1 个答案: