java IO框架 IO流 file对象的创建

package com.test.file;

import java.io.File;

public class Testfile {
	public static void main(String[] args) {
		//创建文件对象
		//方式1
		File file = new File("/Users/yangjunbo/kaifa/Test/1.md");
		//方式2
		File file2 = new File("/Users/yangjunbo/kaifa/Test","1.md");
		//方式3
		File file3 = new File("/Users/yangjunbo/kaifa/Test");
		File file4 = new File(file3,"1.md");
		
		if(file4.exists()) {
			System.out.println("文件存在");
		}else {
			System.out.println("文件不存在");
		}
	}
}