Question

我很难将“％：”添加到发生替换的行中。该程序遍历整个字母表，并将所有小写字母转换为大写字母，将大写字母转换为小写字母。然后，在文件的末尾，它应该添加

"%: a: x:b: y....z: z"

其中x，y和z是每行发生的替换次数。我怎样才能将“％：”添加到具有替换的行？并且还要注意，如果有替换，每行只有一个“％：”。谢谢。

    File file = new File("old.tex");
    Scanner scanner = new Scanner(file);
    PrintWriter writer = new PrintWriter("new.tex");
    while(scanner.hasNextLine()){
        int numberlc;
        int numberuc;
    String line = scanner.nextLine();
    line=line+ "%:";
    for(char ch='a';ch<='z';ch++){
        numberlc=numberOccurances(line, ch);
        char upperch=Character.toUpperCase(ch);
        numberuc=numberOccurances(line, upperch);
        for(int y=0; y<line.length(); y++){
            if(line.charAt(y)==ch)
                line=line.substring(0,y) + upperch + line.substring(y+1);
            else if(line.charAt(y)==upperch)
                line=line.substring(0,y) + ch + line.substring(y+1);
        }
        if(numberlc>0)
            line=line + ch + " " + numberlc + ":";
        if(numberuc>0)
            line=line + upperch + " " + numberuc + ":";
    }
    writer.println(line);
}
writer.close()

Answer 1

我建议您将这些添加内容分开，直到您完成该行。

这样的事情：

StringBuilder changes = new StringBuilder("%: ");
for(char ch='a';ch<='z';ch++){
    numberlc=numberOccurances(line, ch);
    char upperch=Character.toUpperCase(ch);
    numberuc=numberOccurances(line, upperch);
    for(int y=0; y<line.length(); y++){
        if(line.charAt(y)==ch)
            line=line.substring(0,y) + upperch + line.substring(y+1);
        else if(line.charAt(y)==upperch)
            line=line.substring(0,y) + ch + line.substring(y+1);
    }
    if(numberlc>0)
        changes.append(ch + " " + numberlc + ":");
    if(numberuc>0)
        changes.append(upperch + " " + numberuc + ":");
}
if (changes.length() > 3)
    line += changes.toString();
writer.println(line);

注意：此代码未经过测试

如何每行只更换一次？

1 个答案: