Java文件操作之IO流 File类的使用详解

File file1 = new File("hello.txt"); //相对路径
File file2 = new File("C:\\IDEA\\untitled\\file\\hi.txt"); //绝对路径

File file3 = new File("C:\\IDEA\\untitled\\", "file");

File file3 = new File("C:\\IDEA\\untitled\\", "file");
File file4 = new File(file3, "hi.txt");

import java.io.File;

/**
 * @Author: Yeman
 * @Date: 2021-09-24-21:50
 * @Description:
 */
public class FileTest {
    public static void main(String[] args) {
        File file1 = new File("hello.txt");
        File file2 = new File("C:\\IDEA\\untitled\\file\\hi.txt");

        System.out.println(file1.getAbsolutePath());
        System.out.println(file1.getPath());
        System.out.println(file1.getName());
        System.out.println(file1.getParent());
        System.out.println(file1.length());
        System.out.println(file1.lastModified());

        System.out.println(file2.getAbsolutePath());
        System.out.println(file2.getPath());
        System.out.println(file2.getName());
        System.out.println(file2.getParent());
        System.out.println(file2.length());
        System.out.println(file2.lastModified());
    }
}

import java.io.File;

/**
 * @Author: Yeman
 * @Date: 2021-09-24-21:50
 * @Description:
 */
public class FileTest {
    public static void main(String[] args) {
        File file1 = new File("hello.txt"); //file1需要在硬盘中真实存在
        File file2 = new File("C:\\IDEA\\hi.txt"); //在硬盘中不存在file2
        boolean b = file1.renameTo(file2);
        System.out.println(b);
    }
}

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

/**
 * @Author: Yeman
 * @Date: 2021-09-24-21:50
 * @Description:
 */
public class FileTest {
    public static void main(String[] args) throws IOException {
        File file1 = new File("hello.txt");
        if (!file1.exists()){
        	//文件不存在，创建
            file1.createNewFile();
            System.out.println("创建成功");
        }else {
        	//文件存在，删除
            file1.delete();
            System.out.println("删除成功");
        }
    }
}