Posted on: February 8, 2008 at 12:00 AM
Java Notes
Example - FileTest.java
This program prints many of the File charactistics.
This program takes the file name as argument and then prints the various characteristics of the file on console.
If file is present then if prints various characteristics of the file using following code:
System.out.println("canRead() = " + f.canRead());
System.out.println("canWrite() = " + f.canWrite());
System.out.println("getPath() = " + f.getPath());
System.out.println("getAbsolutePath() = " + f.getAbsolutePath());
System.out.println("getCanonicalPath() = " + f.getCanonicalPath());
System.out.println("getAbsoluteFile() = " + f.getAbsoluteFile());
System.out.println("toURL()= " + f.toURL());
System.out.println("toURI()= " + f.toURI());
System.out.println("getParent() = " + f.getParent());
System.out.println("isAbsolute() = " + f.isAbsolute());
boolean isDirectory = f.isDirectory();
System.out.println("isDirectory() = " + isDirectory);
System.out.println("isFile() = " + f.isFile());
System.out.println("isHidden() = " + f.isHidden());
System.out.println("lastModified() = " + (d = f.lastModified())
Here is the complete code example:
// io/FileTest.java - Show values of some File methods.
// 2002-01-16 (Catania) -- Fred Swartz
import java.io.*;
import java.util.*;
class FileTest {
public static void main(String[] args) {
//-- Make sure there is one parameter
if (args.length != 1) {
System.err.println("ERROR: must have 1 parameter");
System.exit(1);
}
try {
File f = new File(args[0]);
long d;
System.out.println("getName() = " + f.getName());
System.out.println("getAbsoluteFile().getName() = "
+ f.getAbsoluteFile().getName());
boolean exists = f.exists();
System.out.println("exists() = " + exists);
if (!exists) {
System.exit(1);
}
System.out.println("canRead() = " + f.canRead());
System.out.println("canWrite() = " + f.canWrite());
System.out.println("getPath() = " + f.getPath());
System.out.println("getAbsolutePath() = " + f.getAbsolutePath());
System.out.println("getCanonicalPath() = " + f.getCanonicalPath());
System.out.println("getAbsoluteFile() = " + f.getAbsoluteFile());
System.out.println("toURL() = " + f.toURL());
System.out.println("toURI() = " + f.toURI());
System.out.println("getParent() = " + f.getParent());
System.out.println("isAbsolute() = " + f.isAbsolute());
boolean isDirectory = f.isDirectory();
System.out.println("isDirectory() = " + isDirectory);
System.out.println("isFile() = " + f.isFile());
System.out.println("isHidden() = " + f.isHidden());
System.out.println("lastModified() = " + (d = f.lastModified())
+ " = " + new Date(d));
System.out.println("length() = " + f.length());
if (isDirectory) {
String[] subfiles = f.list();
for (int i=0; i<subfiles.length; i++) {
System.out.println("file in this dir = " + subfiles[i]);
}
}
} catch (IOException iox) {
System.err.println(iox);
}
}//endmethod main
}//endclass FileTest