【问题】

I've created a Java program in Eclipse. The program counts the frequency of each word. For example if the user entered'I went to the shop'the program would produce the output'1 1 1 2'that is 1 word of length 1 ('I') 1 word of length 2 ('to') 1 word of length 3 ('the') and 2 words of length 4 ('went','shop').

I've created this program to read a string entered by the user but I'm wanting to adjust the code to read each line of a text file. Any help would be great.

import java.util.Scanner;

public class WordLengthFrequency

{

    public static void main(String[] args)

    {

        Scanner scan = new Scanner(System.in);

        while (true)

        {

            System.out.println("Enter text:");

            String s;

            s = scan.nextLine();

            String input = s;

            String strippedInput = input.replaceAll("\\W", " ");

            System.out.println("" + strippedInput);

            String[] strings = strippedInput.split(" ");

            int[] counts = new int[6];

            int total = 0;

            for (String str : strings)

                if (str.length() < counts.length)

                    counts[str.length()] += 1;

            for (String s1 : strings)

                total += s1.length();  

            for (int i = 1; i < counts.length; i++){   

                StringBuilder sb = new StringBuilder(i).append(i + "letter words:");

                for (int j = 1; j <= counts[i]; j++) {

                    sb.append('*');

                    System.out.println(i + "letter words:" + counts[i]);

                    System.out.println(sb);

                    System.out.println(("mean lenght:") + ((double) total / strings.length));

                }

            }

       }

    }

}

【回答】

       JAVA直接写很麻烦，用SPL写一个简单的脚本，然后集成进Java就行了，如何集成可以参考Java 如何调用 SPL 脚本

A1：从文本读取字符串

A2：将字符串拆分成单个单词组成的序列

A3：对序列A2按照单词长度分组，并计算每组单词数量