Use Java to delete a specified folder in the disk

principle

Deleting a folder mainly calls the delete() method in File, but the delete() method can only delete standard files, so when deleting a file here, you need to use the idea of ​​traversal and recursion to delete a folder

Code display

Show some below 内联代码片.

public class TestDelete {
    
    
	public static void main(String[] args) {
    
    
		TestDelete test = new TestDelete();
		String path = "E:\\creata";
		test.deleteDir(path);
	}
    public void deleteDir(String path) {
    
    
    	//指定磁盘里需要删除的文件
    	File file = new File(path);
    	//遍历文件
    	File[] listFiles = file.listFiles();
    	for (File f:listFiles) {
    
    
    		//判断是标准的文件还是文件夹
			if (f.isDirectory()) {
    
    
				//标准文件夹运用运用递归把里面的标准文件在遍历一次
				String path2 = f.getPath();
				deleteDir(path2);
			}else {
    
    
				//不是标准文件直接调用delete()方法删除
				f.delete();
			}
		}
    	//最后把空文件夹删除
    	file.delete();
    } 
}

to sum up

To delete a folder, you need to master the ideas of recursion and traversal. Because there are multiple files in a folder, the idea of ​​traversal is also very important. Next, you can master the operation process of deleting a file:
generally traverse the file first, and then determine that the file is the standard The file is still a standard folder. If it is a standard file, call the delete() method directly to delete;
if it is a folder, then we need to use the recursive idea to traverse the file again and judge until the entire file is deleted; the
last step is to delete the file. Delete the outer folder and it's over