java - Java中字符串定界程序中的差一错误

Question

以下程序的目标是通过分隔符 "/" "" 和 ":" 来分隔源字符串。预期输出是 20 03 2016 17 30 但它只产生 20 03 2016 17，省略了最后一个元素。也许是一些差一错误？

public static void main(String[] args) {
    String source = "20/03/2016:17:30";
    String sep = "/:";
    String[] result = new String[5];
    String str = "";
    int index = 0;

    for (int sourcePos = 0; sourcePos < source.length(); sourcePos++) {
        int compt = 0;

        for (int sepPos = 0; sepPos < sep.length(); sepPos++) {
            if (source.charAt(sourcePos) == sep.charAt(sepPos)) compt++;
        }

        if (compt > 0) {
            result[index] = str;
            System.out.print(" " + result[index]);

            if (index < result.length)
                index++;
            else
                break;

            str = "";
        } else {
            str = str + source.charAt(sourcePos);
        }
    }
}

Answer 1

您可以简单地使用 regex :

String[] result = source.split("/|:");  

至于你的代码，你差一个的原因是主要的for在您到达 if (compt > 0) 之前循环终止最后一次。换句话说，sourcePos < source.length()是false , 在你可以添加最后一个 str 之前.

你可以这样:

for (int sourcePos = 0; sourcePos < source.length() ; sourcePos++) {
    boolean compt = false;

    for (int sepPos = 0; sepPos < sep.length(); sepPos++) {
        if (source.charAt(sourcePos) == sep.charAt(sepPos)) { 
            compt = true;
            break;
        }
    }

    if (compt) {
        result[index] = str;
        index++;
        str = "";
    } 

    else if(sourcePos == source.length()-1) {
        result[index] = str + source.charAt(sourcePos);
    }

    else {
        str = str + source.charAt(sourcePos);
    }
}