File Class method canRead(), returns true when it is present.

import java.io.File;
//javac File_CanRead.java
public class File_CanRead {
public static void main(String[] a) {
File myFile = new File("C:" + File.separator + "myjava" + File.separator+"File_class"+File.separator, "my.txt");
System.out.println(myFile.canRead());
}
}