Expert Solutions

In java, literals are used for storing the constant value. Example :- “Literals” denoted String Literals, ‘P’ denoted Character Literals,  93.8 denotes floating points value Literals, 786 denotes an Integer Literals

Java had eight (8) primitive data type. 1) byte                  Width : 8 Range : -128 to 127 2) short                 Width : 16 Range : -32768 to 32767 3)int                       Width : 32 Range : -2147483648 to 2147483647 4) long                   Width : 64 Range : -9223372036854775808 to 9223372036854775807 Above four primitive data type belongs to Integers. 5) float                  Width : 32 Range 1.4e-045 to 3.4e+308 6) double             Width : 64 Range 4.9e-324 to 1.8e+308 Above two primitive data type belongs to Floating Point Types. 7) boolean 8) char

import java.io.File; public class TestDirReader{   public static void main(String[] args) {               File folder = new File("C://testDir");             File[] filesList= folder.listFiles();             for (int i = 0; i < filesList.length; i++) {               if (filesList[i].isDirectory()) {                 System.out.println("Directory Name :" + filesList[i].getName());               }else if (filesList[i].isFile()) {                 System.out.println("File Name :" + filesList[i].getName());               }             }   } }

public int convertDPI(String inputImage, String outputImage, String density) {         int returnCode = 0;         Process process;         try {             String[] command = { "convert", "-density", density, inputImage, outputImage };             process = Runtime.getRuntime().exec(command);             returnCode = process.waitFor();         } catch (IOException e) {             e.printStackTrace();         } catch (InterruptedException e) {             e.printStackTrace();         }         return returnCode;     }

Make  thumbnails in jpg format of  Videos : - Point to Note:- There is need to install ffmpeg in your system. public int compressVideioToJpg(String inputVideo, String outputJpg) {     int returnCode = 0;     Process process;     try {         System.out.println("compressVideioToJpg called");         System.out.println("inputVideo:"+inputVideo);         System.out.println("outputVidio:"+outputJpg);         String[] command = { "ffmpeg", "-i", inputVideo , "-an", "-r", ".1", "-y","-s","236x148", outputJpg};         System.out.println("22:");         process = Runtime.getRuntime().exec(command);         System.out.println("after process JPG");         returnCode = process.waitFor();         System.out.println("returnCode JPG:"+returnCode);     } catch (IOException e) {         e.printStackTrace();     } catch (InterruptedException

public static int getNoOfDays(int month, int year){     Calendar calendar = Calendar.getInstance();     int date = 1;     calendar.set(year, month, date);     int days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);     return days; }

import java.io.PrintStream; public class EDU_EncryptDecrypt {     public EDU_EncryptDecrypt()     {     }     public String EDU_getEncryptionDecryptionKey(String seed, String ktype)     {         if(ktype.equals("MSTR_KEY"))             return "89245317";         else             return seed;     }     public String EDU_dataEncryptDecrypt(String istr, String kval)     {         byte bute[] = istr.getBytes();         byte bute1[] = kval.getBytes();         int count = 0;         String cstr = "";         for(int i = 0; i < bute.length; i++)         {             int j = bute[i];             if(i % 8 == 0)                 count = 0;             int k = bute1[count];             j ^= k;             cstr = cstr + (byte)j;             count++;         }         return cstr;     } }

import java.awt.Container; import java.awt.FlowLayout; import java.awt.event.*; import java.io.File; import javax.swing.*; public class Test extends JFrame {     public Test()     {         super("Simple File Chooser Application");         chooser = new JFileChooser();         button = new JButton("show file chooser ...");         Container contentPane = getContentPane();         contentPane.setLayout(new FlowLayout());         contentPane.add(button);         button.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent e)             {                 chooser.setFileSelectionMode(1);                 int state = chooser.showOpenDialog(null);                 File file = chooser.getSelectedFile();                 if(file != null && state == 0)                     JOptionPane.showMessageDialog(null, file.getPath());                 else                 if(state == 1)                     JOptionP