Java UnknownFormatConversionException ： Conversion = 'm'

Question

我有这样的代码

if (jcb_rtsplit.isSelected()) {
        ArrayList<String> temp = P.RT_Split(dataTraining);
        writeFile(temp);
        cekRTSplit = true;
        cekRT = true;
    }

和代码方法writefile((类似：

public void writeFile(ArrayList<String> temp){
    CreatingFile file = new CreatingFile();
    file.openFile("RT Split.txt");
    for (int i = 0; i < temp.size(); i++) {
        file.addRecord(temp.get(i));
    }
    file.close();
}

这是这样创建的代码：

private Formatter x;
public void openFile(String name){
    try {
        x = new Formatter(name);
    } catch (Exception e) {
        System.out.println("you have an error");
    }
}
public void addRecord(String input){
    x.format(input);
    x.format("%n", "pratiwi");
}
public void close(){
    x.close();
}

但是，当我运行此程序时，我有这样的错误：

Exception in thread "AWT-EventQueue-0" java.util.UnknownFormatConversionException: Conversion = 'm'
at java.util.Formatter$FormatSpecifier.conversion(Formatter.java:2691)
at java.util.Formatter$FormatSpecifier.<init>(Formatter.java:2720)
at java.util.Formatter.parse(Formatter.java:2560)
at java.util.Formatter.format(Formatter.java:2501)
at java.util.Formatter.format(Formatter.java:2455)
at program.CreatingFile.addRecord(CreatingFile.java:25)
at program.TUtama.writeFile(TUtama.java:758)

有人可以帮助我的代码吗？谢谢的

Answer 1

您的文件包含一个"％m"，会导致异常(" 52.01％mengungguli"(。您可以使用此简单示例尝试：

    Formatter f = new Formatter("datatraining.txt");
    f.format("%m");
    f.format("%n", "pratiwi");
    f.close();

输出：

Exception in thread "main" java.util.UnknownFormatConversionException: Conversion = 'm'
    at java.util.Formatter$FormatSpecifier.conversion(Unknown Source)
    at java.util.Formatter$FormatSpecifier.<init>(Unknown Source)
    at java.util.Formatter.parse(Unknown Source)
    at java.util.Formatter.format(Unknown Source)
    at java.util.Formatter.format(Unknown Source)
    at Test.main(Test.java:14)

，如果不是格式指定符