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我需要这段代码来压缩和解压缩用户给定的字符串，要压缩用户将键入“java compression -c”或只是“java compression”。要解压缩，它将是“java压缩-d”。任何帮助，将不胜感激。它现在将编译并运行；但是，当您输入字符串时，它只会打印出 compress 而不是压缩的字符串。

import java.util.*;
public class practice
{
    public static void main(String args[])
    {
        Scanner scan = new Scanner(System.in);
        String originalString = scan.nextLine();
        String compressedString = "";
        int index = 0;
        int numReps = 0;
        char nextChar = ' ';
        if (args.length==0 || args[0].equals("-c"))
        {
            System.out.println("compress");
            String s = scan.next();
            compress(originalString);
            System.out.println(compressedString);
        }
        else if (args[0].equals("-d"))
        {
            System.out.println("decompress");
            decompress(compressedString);
        }
        else
        {
            System.out.println("Error! Unknown mode.");
        }

    }

    public static void compress(String originalString)
    {
        int index = 0;
        int numReps = 0;
        char nextChar = ' ';
        while (index < originalString.length())
        {
            numReps = 0;
            char c = originalString.charAt(index);
            if (!Character.isDigit(c))
            {
                nextChar = c;
                index++;
            }
            else
            {
                while (Character.isDigit(c))
                {
                    int temp = Integer.parseInt(""+c);
                    numReps = temp;
                    index++;
                    if (index >= originalString.length()) break;
                    c = originalString.charAt(index);
                }
                for (int i =0; i<numReps; i++)
                {
                    System.out.println(nextChar);
                }
            }
        }
    }

    public static void decompress(String compressedString)
    {
        int index = 0;
        int numReps = 0;
        char nextChar = ' ';

        while (index < compressedString.length())
        {
            numReps = 0;
            char c = compressedString.charAt(index);
            if (!Character.isDigit(c))
            {
                nextChar = c;
                index++;
            }
            else
            {
                while (Character.isDigit(c))
                {
                    int temp = Integer.parseInt(""+c);
                    numReps = (numReps*10) + temp;
                    index++;
                    if (index >= compressedString.length()) break;
                    c = compressedString.charAt(index);
                }
                for (int i =0; i<numReps; i++)
                {
                    System.out.println(nextChar);
                }
            }   
        }
    }
}
4

2 回答 2

1

您忘记了方法定义的类型参数：

public static void decompress(compressedString)

应该

public static void decompress(String compressedString)

甚至更好

public static void decompress(final String compressedString)
于 2013-10-04T23:08:21.963 回答
0

您的代码中有两件事出了问题（据我所知）：-

  1. public static void decompress(compressedString)实际上应该是public static void decompress(**String** compressedString)。您必须告诉method它argument它将接收的String类型。

  2. 在你的compress和decompress方法中你有while (index < input.length());. 检查；在最后。你真的想要那个。您将永远不会执行while循环，因为您甚至在它开始之前就终止了它。

于 2013-10-04T23:14:59.277 回答