Java循环和增量问题

问题描述

任何人可以告诉我我的程序有什么问题？

  String a []，b []; 
 int c [] = new int [b.length]; （int j = 0; j  for（int k = 0; k  if（b [k] .equals（a [j]））{
c [k] ++; 
} else {
 c [k] = 0; 
} 
} 
} 
  

我有数千个字存储在 HashMap 中。现在我想检查每个文件，从 allWords 发出多少次一个字。

你可以指出我的程序中的错误，或者给我你的想法，我该怎么做？

解决方案

您可以在阅读文件时计算单词并存储在地图上。
假设文件上的最后一个字是-1，一行中只有一个字，甚至如果这个词是生日快乐，我会做这样的事情：

  import java.util.HashMap; 
 import java.util.Iterator; 
 import java.util.Map; 
 import java.util.Scanner; 
 
 public class StackOverflow {
 
 @SuppressWarnings（unchecked）
 public static void main（String [] args）{
扫描仪扫描器=新扫描仪（System.in）; 
 Map< String，Integer> countWords = new HashMap< String，Integer>（）; 
 int numberOfWords = 0; 
字符串字=; 
 while（true）{
 word = scanner.nextLine（）; 
 if（word.equalsIgnoreCase（ -  1））{
 break; 
} 
 if（countingWords.containsKey（word））{
 numberOfWords = countingWords.get（word）; 
 countingWords.put（word，++ numberOfWords）; 
} else {
 countingWords.put（word，1）; 
} 
} 
迭代器it = countWords.entrySet（）。iterator（）; 
 while（it.hasNext（））{
 Map.Entry pairs =（Map.Entry）it.next（）; 
 System.out.println（pairs.getKey（）+=+ pairs.getValue（））; 
} 
} 
} 
  

Can any one tell me what is the problem in my program?

String a[],b[];
int c[] = new int[b.length];

for (int j = 0; j < a.length; j++) {
    for (int k = 0; k < b.length; k++) {
        if (b[k].equals(a[j])) {
            c[k]++;
        } else {
            c[k] = 0;
        }
    }
}

I have thousands of words stored in a HashMap. Now I want to check in every file that how many time one word occurred from allWords.

Can you point out mistake in my program or give me your idea that how I can do it?

解决方案

You could count words while reading your files and store on a Map already..Assuming last word on file is "-1" and there's only one word in a line, even if the word is "happy birthday", I'd do something like this:

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Scanner;

public class StackOverflow {

@SuppressWarnings("unchecked")
public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    Map<String, Integer> countedWords = new HashMap<String, Integer>();
    int numberOfWords = 0;
    String word = "";
    while (true) {
        word = scanner.nextLine();
        if (word.equalsIgnoreCase("-1")) {
            break;
        }
        if (countedWords.containsKey(word)) {
            numberOfWords = countedWords.get(word);
            countedWords.put(word, ++numberOfWords);
        } else {
            countedWords.put(word, 1);
        }
    }
    Iterator it = countedWords.entrySet().iterator();
    while (it.hasNext()) {
        Map.Entry pairs = (Map.Entry)it.next();
        System.out.println(pairs.getKey() + " = " + pairs.getValue());
    }
}
}

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