Getting a absolute path
To find a file or directory it is very necessary to
know the path of the file or directory so that you can access it. If you know
the path then it is very easy to work on it. Suppose a situation where a problem
comes in front you where you don't know the path of the file, then what will you
do. Then this problem can be solved by using a method getAbsolutePath().The method
getAbsolutePath() should be used where we don't know the exact
path of the file.
To find an absolute path of a file, Firstly we have to
make a class GetAbsolutePath. Inside this class define the main method.
Inside this method define a File class of java.io package. Inside the
constructor of a File class pass the name of the file whose absolute path you
want to know. Now call the method getAbsolutePath() of the File class
by the reference of File class and store it in a String variable.
Now print the string, you will get a absolute path of the file.
In this class we have make use of the following things by which this problem can
be solved.
File: It is class in java.io package. It
implements Comparable and Serializable interface.
getAbsolutePath(): It returns the absolute
path name in the form of string.
Code of the program is given below:
import java.io.*;
public class GetAbsolutePath{
public static void main(String[] args){
String str = args[0];
File file = new File(str);
String absolutePathOfFirstFile = file.getAbsolutePath();
System.out.println(" The absolute path in first form is "
+ absolutePathOfFirstFile);
file = new File( "chandan" + File.separatorChar+ str);
String absolutePathOfSecondFile = file.getAbsolutePath();
System.out.println(" The absolute path is " + absolutePathOfSecondFile);
file = new File("chandan" + File.separator + ".." + File.separator + str);
String absolutePathOfThirdFile = file.getAbsolutePath();
System.out.println(" The absolute path is " + absolutePathOfThirdFile);
}
}
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Output of the program
C:\java>java GetAbsolutePath chandan
The absolute path in first form is C:\tapan\chandan
The absolute path is C:\tapan\chandan\chandan
The absolute path is C:\tapan\chandan\..\chandan |
Download this example.
Getting the Parents of a Filename
Program uses getParent( ) method of the
File
class object to find the parent directory
name of the current directory. For example,
System.getProperty("user.dir"):
This method returns the user's current directory. The
getProperty()
method
is the system method which is imported from the System class of the java.lang.*;
package. This method tells about the system property according to the indicating
argument. Here, the indicating argument user.dir indicates about the current
directory.
Here is the code of the program :
import java.io.*;
public class GetParentDir{
private static void dirlist(String fname){
File dir = new File(fname);
String parentpath = dir.getParent();
System.out.println("Current Directory : "+ dir);
System.out.println("parent Directory : "+ parentpath);
}
public static void main(String[] args){
String currentdir = System.getProperty("user.dir");
dirlist(currentdir);
}
}
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Output of the program
C:\nisha>javac GetParentDir.java
C:\nisha>java GetParentDir
Current Directory : C:\nisha
parent Directory : C:\
C:\nisha> |
Download this example.
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