Learn Intermediate Java: Input and Output

                                
Scanner scanner = new Scanner(System.in);
System.out.print("Enter your name: ");
String name = scanner.nextLine();
System.out.println("Hello, " + name + "!");

                              

                                
import java.io.FileReader;
  import java.io.IOException;
  
  public class Main {
      public static void main(String[] args) {
          try {
              FileReader file = new FileReader("file.txt");
          } catch (IOException e) {
              System.out.println("An error occurred: " + e.getMessage());
          }
      }
  }

                              

                                
javac MyProgram.java
java MyProgram

                              

                                
import java.io.FileInputStream;
  import java.io.IOException;
  
  public class Main {
      public static void main(String[] args) {
          // Using try-with-resources to automatically close the FileInputStream
          try (FileInputStream fileInput = new FileInputStream("file.txt")) {
              int data = fileInput.read();
              while (data != -1) {
                  System.out.print((char) data);  // Cast to char to print as characters
                  data = fileInput.read();  // Read next byte
              }
          } catch (IOException e) {
              // Handle any IOExceptions (file not found, reading error, etc.)
              System.out.println("An error occurred while reading the file: " + e.getMessage());
          }
      }
  }
  

                              

                                

import java.io.FileOutputStream;
import java.io.IOException;

public class Main {
    public static void main(String[] args) {
        // Using try-with-resources to ensure that the FileOutputStream is closed automatically
        try (FileOutputStream fileOutput = new FileOutputStream("output.txt")) {
            // Write the string "Hello, World!" to the file
            fileOutput.write("Hello, World!".getBytes());  // Converts string to byte array
        } catch (IOException e) {
            // Handle any IOException (e.g., file write error)
            System.out.println("An error occurred while writing to the file: " + e.getMessage());
        }
    }
}
  

                              

                                
System.out.println("This is a line of text.");
System.out.print("This is text without a newline.");
System.out.printf("Formatted number: %.2f", 3.14159);