ANBUMANI

 import java.lang.*; import java.io.*; class Questions{ public String [][]qpa;  public String[][]qca;  Questions()throws IOException { qpa=new String[10][5]; DataInputStream in=new DataInputStream(System.in); qpa[0][0]="How to run Javaprogram on the command prompt?";  qpa[0][1]="1.javac JavaProgram"; qpa[0][2]="2.java JavaProgram";  qpa[0][3]="3.javac JavaProgram.java"; qpa[0][4]="4.No one"; qpa[1][0]="What is the use of the println method?";  qpa[1][1]="1.It is used to print text on the screen."; qpa[1][2]="2.It is used to print text on the screen with the linebreak.";  qpa[1][3]="3.It is used to read text from keyboard."; qpa[1][4]="4.It is used to read text from a file."; qpa[2][0]="How to read a character from the keyboard?";  qpa[2][1]="1.char c=System.read()"; qpa[2][2]="2.charc=System.in.read()"; qpa[2][3]="3.charc=(char)System.read()"; qpa[...

 import java.io.File; import java.io.FileWriter; import java.io.FileReader; import java.io.BufferedReader; import java.io.IOException; public class FileOperations {     public static void main(String[] args) {         String filePath = "example.txt";         // Create a file         createFile(filePath);         // Write to the file         writeFile(filePath, "Hello, this is a test file.");         // Read from the file         readFile(filePath);         // Delete the file         deleteFile(filePath);     }     // Method to create a file     public static void createFile(String filePath) {         try {             File file = new File(filePath);             if (file.createNewFile()) ...