Java只读取最后一个char [英] Java only reads the last char

问题描述

假设A = 1，B = 2，C = 3

如果我输入ABC，输出应该是123而是333，因为java只读取最后一个char.Below是我的代码。任何asap帮助将不胜感激thx。



我尝试过：

Assume A=1,B=2, C=3
If i input ABC, the output should be 123 but instead 333 because java only reads the last char.Below is my code. Any asap help would be appreciated thx.

What I have tried:

public static void main(String[] args) {
        // TODO code application logic here
        Scanner input = new Scanner(System.in);
        System.out.println("Please enter a 10 character word:");
        String a = input.nextLine();
        String letters = a.substring(0,3);
        char letter[] = letters.toCharArray();
        
        for(int i=0;i<letter.length;i++){
         for(char c: letter){
             switch(c){
                 case 'A':case'B': case 'C': case 'a': case'b': case 'c': letter[i]='0';break;
                 case 'D':case'E': case 'F': case 'd': case'e': case 'f': letter[i]='1';break;
                 case 'G':case'H':case'I':case'g':case'i':case'h':letter[i]='2';break;
                 case 'J':case'K':case'L':case'j':case'k':case'l':letter[i]='3';break;
                 case 'M':case'N':case'O':case'm':case'n':case'o':letter[i]='4';break;
                 case 'P':case'Q':case'R':case'p':case'q':case'r':letter[i]='5';break;
                 case 'S':case'T':case's':case't':letter[i]='6';break;
                 case 'U':case'V':case'u':case'v':letter[i]='7';break;
                 case 'W':case'X':case'w':case'x':letter[i]='8';break;
                 case 'Y':case'Z':case'y':case'z':letter[i]='9';break;
             }
         }
         System.out.print(letter[i]);
        }System.out.println();

       

           }

推荐答案

你要求一个10个字符，但是然后只提取前三个字母。你有两个 for 循环试图迭代同一个数组。您可以使用更高效的 if else 构造替换开关块。并且代码中的值设置与您的问题中的描述不匹配：您为A，B或C存储0，为D，E，F等存储1 ..



另请参阅上的原始问题https://www.codeproject.com/Questions/1246483/How-to-let-java-read-multiple-characters-at-once-a [ ^ ]。

You ask for a 10 character word, but then extract only the first three letters. You have two for loops trying to iterate the same array. You could replace the switch block with a more efficient if else construction. And the setting of values in your code does not match the description in your question: you are storing 0 for A,B or C, 1 for D,E,F etc..

See also your original question at https://www.codeproject.com/Questions/1246483/How-to-let-java-read-multiple-characters-at-once-a[^].

这篇关于Java只读取最后一个char的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！