import java.util.Scanner; public class DoubleInput { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter a double value: "); double value = scanner.nextDouble(); System.out.println("The value entered is: " + value); scanner.close(); } }
import java.io.File; import java.io.FileNotFoundException; import java.util.Scanner; public class ReadFile { public static void main(String[] args) { try { Scanner scanner = new Scanner(new File("input.txt")); while(scanner.hasNextDouble()) { double value = scanner.nextDouble(); System.out.println("Value read from file: " + value); } scanner.close(); } catch (FileNotFoundException e) { System.out.println("File not found"); } } }In this example, the nextDouble() method is used to read double values from a text file named "input.txt". The method hasNextDouble() is used to check whether there are more double values to be read from the file. If there are, the nextDouble() method is called to read the value and display it on the console. In conclusion, nextDouble() method is part of the java.util package in Java, which allows us to read double values from various input sources. The above examples demonstrate how the method can be used to read input from keyboard or files, and how we can handle exceptions such as file not found errors.