java - 无法从静态上下文引用非静态变量文件路径

Question

我有一个简单的Java程序如下:

public class HelloWorldPrinter {
    String filepath;

    public void setPath(String path){
        this.filepath = path;
    }

    public static void main(String[] args) throws PrintException, IOException {
        FileInputStream in = new FileInputStream(new File(filepath));
    }
}

我收到以下错误:

HelloWorldPrinter.java:40: error: non-static variable filepath cannot be referenced from a static context

FileInputStream in = new FileInputStream(new File(filepath));

我该如何解决这个问题？

Answer 1

一种选择是创建 HelloWorldPrinter 的实例:

public static void main(String[] args) throws PrintException, IOException {
    HelloWorldPrinter printer = new HelloWorldPrinter();
    printer.setPath("path/to/file");

    FileInputStream in = new FileInputStream(new File(printer.getPath()));
}