File类判断功能

public class Demo4_FileMethod {

	/**
	 * * A:判断功能
		* public boolean isDirectory():判断是否是目录
		* public boolean isFile():判断是否是文件
		* public boolean exists():判断是否存在
		* public boolean canRead():判断是否可读
		* public boolean canWrite():判断是否可写
		* public boolean isHidden():判断是否隐藏
	* B:案例演示
		* File类的判断功能
	 */
	public static void main(String[] args) {
		//demo1();
		File file = new File("zzz");
		file.setReadable(false);
		System.out.println(file.canRead()); 			//windows系统认为所有的文件都是可读的
		file.setWritable(true);
		System.out.println(file.canWrite()); 			//windows系统可以设置为不可写
		
		File file2 = new File("aaa.txt");
		System.out.println(file2.isHidden());			//判断是否是隐藏文件
		System.out.println(file.isHidden());
	}

	public static void demo1() {
		File dir1 = new File("ccc");
		System.out.println(dir1.isDirectory());			//判断是否是文件夹
		
		File dir2 = new File("zzz");
		System.out.println(dir2.isDirectory());
		
		System.out.println(dir1.isFile());				//判断是否是文件
		System.out.println(dir2.isFile());
	}

}