learning java 访问文件和目录

import java.io.File;
import java.io.IOException;

public class FileTest {
    public static void main(String[] args) throws IOException {
        var file = new File(".");
        System.out.println(file.getName());
        System.out.println(file.getParent());

        System.out.println(file.getAbsoluteFile());
        System.out.println(file.getAbsoluteFile().getParent());

        File tmpFile = File.createTempFile("aaa", ".txt", file);

        tmpFile.deleteOnExit();

        var newFile = new File(System.currentTimeMillis()  + "");
        System.out.println("newFile 对象是否存在：" + newFile.exists());

        boolean cB = newFile.createNewFile();
        System.out.println(cB);

        boolean cd = newFile.mkdir();
        System.out.println(cd);

        String[] fileList = file.list();
        System.out.println("=====当前路径下所有文件和路径如下");
        for (var fileName : fileList){
            System.out.println(fileName);
        }

        File[]  roots = File.listRoots();
        System.out.println("====系统所有根路径如下====");
        for (var root : roots){
            System.out.println(root);
        }

    }
}

output: