A stack can be implemented using a LinkedList by managing the LinkedList as a stack. This is done by using a class Stack which contains some of the Stack methods such as push(), top(), pop() etc.A program that demonstrates this is given as follows −Example Live Demoimport java.util.LinkedList; class Stack { ... Read More

The ftp_pwd() function returns the present working directory i.e. the current directory.Syntaxftw_pwd(con)Parameterscon − The FTP connectionReturnThe ftp_pwd() function returns TRUE on success or FALSE on failure.ExampleThe following is an example −

The method java.io.File.isFile() is used to check whether the given file is an existing file in Java. Similarly, the method java.io.File.isDirectory() is used to check whether the given file is a directory in Java. Both of these methods require no parameters.A program that demonstrates this is given as follows −Examplepublic ... Read More

To work with SimpleDateFormat class in Java, import the following package.import java.text.SimpleDateFormat;Now, set the format with SimpleDateFormat(“s”) to display seconds in one-digit.Format f = new SimpleDateFormat(”s”);Now, get the seconds in a string.String strSeconds = f.format(new Date());The following is an example −Example Live Demoimport java.text.Format; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Calendar; public ... Read More

The method java.io.File.exists() is used to check whether a file or a directory exists or not. This method returns true if the file or directory specified by the abstract path name exists and false if it does not exist.A program that demonstrates this is given as follows −Exampleimport java.io.File; public ... Read More

The lower() method of NavigableSet returns the greatest element strictly less than the given element i.e. 35 here −lower(35);The following is an example to implement the lower() method in Java −Example Live Demoimport java.util.NavigableSet; import java.util.TreeSet; public class Demo { public static void main(String[] args) { ... Read More

Let us set a radix here as.// radix int r = 32;Include the radix here as a BigInteger constructor.BigInteger one = new BigInteger("vv", r);Now get its string representation −String strResult = one.toString(radix);The following is an example −Example Live Demoimport java.math.*; public class Demo { public static void main(String[] ... Read More

The ftp_raw() function is used to sends raw command to the FTP server.Syntaxftp_raw(con, command)Parameterscon − The FTP connectioncommand − The command to executeReturnThe ftp_raw() function returns the server's response as an array of strings.ExampleThe following is an example −

The name of the specified file or directory can be obtained using the method java.io.File.getName(). The getName() returns the name of the file or the directory and it requires no parameters.A program that demonstrates this is given as follows −Example Live Demoimport java.io.File; public class Demo {    public static void ... Read More

First, use the getenv() method to get the environment variables −System.out.println("PATH = " + System.getenv("PATH"));Now, get the key and value. Loop through to get the list of environment variables −Map e = System.getenv(); for (Iterator i = e.entrySet().iterator(); i.hasNext();) { Map.Entry mapEntry = (Map.Entry) i.next(); ... Read More