英文:
Is it not possible to access a scanner within a scanner in Java?
问题
以下是您要翻译的内容:
package com.company;
import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Provide the name of the figure you want to calculate the area of: circle, triangle, rectangle, square, trapezium, parallelogram.");
String input = scanner.nextLine();
if (input.equalsIgnoreCase("circle")) {
scanner.close();
Circle.calculateCircleArea();
} else if (input.equalsIgnoreCase("square")) {
scanner.close();
Square.calculateSquareArea();
} else if (input.equalsIgnoreCase("trapezium")) {
scanner.close();
Trapezium.calculateTrapeziumArea();
} else if (input.equalsIgnoreCase("parallelogram")) {
scanner.close();
Parallelogram.calculateParallelogramArea();
} else if (input.equalsIgnoreCase("rectangle")) {
scanner.close();
Rectangle.calculateRectangleArea();
} else if (input.equalsIgnoreCase("triangle")) {
scanner.close();
Triangle.calculateTriangleArea();
} else {
System.out.println("Invalid figure. Make sure it's spelled correctly and run the program again.");
scanner.close();
}
}
}
class Circle {
public static void calculateCircleArea() {
Scanner circleScanner = new Scanner(System.in);
System.out.println("Provide the radius of the circle:");
double radius = circleScanner.nextDouble();
System.out.println("The area of the circle is: " + (Math.PI * Math.pow(radius, 2)));
circleScanner.nextLine();
circleScanner.close();
}
}
class Square {
public static void calculateSquareArea() {
Scanner squareScanner = new Scanner(System.in);
System.out.println("Provide the length of one side of the square:");
double side = squareScanner.nextDouble();
System.out.println("The area of the square is: " + Math.pow(side, 2));
squareScanner.nextLine();
squareScanner.close();
}
}
class Trapezium {
public static void calculateTrapeziumArea() {
Scanner trapeziumScanner = new Scanner(System.in);
System.out.println("Provide the length of the smaller base of the trapezium:");
double smallBase = trapeziumScanner.nextDouble();
System.out.println("Provide the length of the larger base of the trapezium:");
double largeBase = trapeziumScanner.nextDouble();
System.out.println("Provide the height of the trapezium:");
double height = trapeziumScanner.nextDouble();
System.out.println("The area of the trapezium is: " + (((smallBase + largeBase) * height) / 2));
trapeziumScanner.nextLine();
trapeziumScanner.close();
}
}
class Parallelogram {
public static void calculateParallelogramArea() {
Scanner parallelogramScanner = new Scanner(System.in);
System.out.println("Provide the length of the base of the parallelogram:");
double base = parallelogramScanner.nextDouble();
System.out.println("Provide the height of the parallelogram:");
double height = parallelogramScanner.nextDouble();
System.out.println("The area of the parallelogram is: " + base * height);
parallelogramScanner.close();
}
}
class Rectangle {
public static void calculateRectangleArea() {
Scanner rectangleScanner = new Scanner(System.in);
System.out.println("Provide the length of the rectangle:");
double length = rectangleScanner.nextDouble();
System.out.println("Provide the height of the rectangle:");
double height = rectangleScanner.nextDouble();
System.out.println("The area of the rectangle is: " + length * height);
rectangleScanner.close();
}
}
class Triangle {
public static void calculateTriangleArea() {
Scanner triangleScanner = new Scanner(System.in);
System.out.println("Provide the length of the base of the triangle:");
double base = triangleScanner.nextDouble();
System.out.println("Provide the height of the triangle:");
double height = triangleScanner.nextDouble();
System.out.println("The area of the triangle is: " + (height * base) / 2);
triangleScanner.close();
}
}
请注意,我已经移除了非代码部分的内容,只返回了代码翻译的部分。如果您有任何问题或需要进一步的帮助,请随时提问。
英文:
Goal: I'm creating a program that would allow me to calculate the area of multiple types of figures. To do so, I want to use a scanner to read user input and assess if the String provided is equal to one of my figure names. If so, it would invoke a method from the figure class that has another scanner.
Error: It's giving me an input mismatch when I enter the figure's name to be redirected to another class' scanner. Here's the error ->
Forneça qual figura dentre estas você deseja calcular a área de: circunferência, triângulo, retângulo, quadrado, trapézio, paralelogramo.
circulo
Forneça o raio do círculo:
Exception in thread "main" java.util.NoSuchElementException: No line found
at java.util.Scanner.nextLine(Scanner.java:1540)
at com.company.Circle.calculateCircleArea(Calculator.java:42)
at com.company.Calculator.main(Calculator.java:14)
Process finished with exit code 1
Here's the code:
package com.company;
import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Forneça qual figura dentre estas você deseja calcular a área de: circunferência, triângulo, retângulo, quadrado, trapézio, paralelogramo.");
String equals = scanner.nextLine();
if (equals.toLowerCase().equals("círculo") || equals.toLowerCase().equals("circulo")) {
scanner.close();
Circle.calculateCircleArea();
} else if(equals.toLowerCase().equals("quadrado")) {
scanner.close();
Square.calculateSquareArea();
} else if(equals.toLowerCase().equals("trapézio") || equals.toLowerCase().equals("trapezio")) {
scanner.close();
Trapezium.calculateTrapeziumArea();
} else if(equals.toLowerCase().equals("paralelogramo") || equals.toLowerCase().equals("paralelograma")) {
scanner.close();
Parallelogram.calculateParallelogramArea();
} else if(equals.toLowerCase().equals("retângulo") || equals.toLowerCase().equals("retangulo")) {
scanner.close();
Rectangle.calculateRectangleArea();
} else if(equals.toLowerCase().equals("triangulo") || equals.toLowerCase().equals("triângulo")) {
scanner.close();
Triangle.calculateTriangleArea();
} else {
System.out.println("Figura inválida. Veja se foi escrita de forma correta e execute o programa novamente.");
scanner.close();
}
}
}
class Circle {
public static void calculateCircleArea() {
Scanner circle = new Scanner(System.in);
System.out.println("Forneça o raio do círculo:");
double radius = circle.nextDouble();
System.out.println("A area do círculo é: " + (Math.PI * Math.pow(radius, 2)));
circle.nextLine();
circle.close();
}
}
class Square {
public static void calculateSquareArea() {
Scanner square = new Scanner(System.in);
System.out.println("Forneça valor de um dos lados do quadrado:");
double side = square.nextDouble();
System.out.println("A area do quadrado é: " + Math.pow(side,2));
square.nextLine();
square.close();
}
}
class Trapezium {
public static void calculateTrapeziumArea() {
Scanner trapezium = new Scanner(System.in);
System.out.println("Forneça o valor da menor base do seu trapézio:");
double smallBase = trapezium.nextDouble();
System.out.println("Forneça o valor da maior base do seu trapézio:");
double largeBase = trapezium.nextDouble();
System.out.println("Forneça o valor da altura do seu trapézio:");
double height = trapezium.nextDouble();
System.out.println("A area de seu trapézio é: " + (((smallBase + largeBase) * height)/2));
trapezium.nextLine();
trapezium.close();
}
}
class Parallelogram {
public static void calculateParallelogramArea() {
Scanner parallelogram = new Scanner(System.in);
System.out.println("Forneça o valor da base do seu paralelogramo:");
double base = parallelogram.nextDouble();
System.out.println("Forneça o valor da altura do seu paralelogramo:");
double height = parallelogram.nextDouble();
System.out.println("A area do seu paralelogramo é: " + base * height);
parallelogram.close();
}
}
class Rectangle {
public static void calculateRectangleArea() {
Scanner rectangle = new Scanner(System.in);
System.out.println("Forneça o valor do comprimento do seu retângulo:");
double length = rectangle.nextDouble();
System.out.println("Forneça o valor da altura do seu retângulo:");
double height = rectangle.nextDouble();
System.out.println("A area do seu retângulo é: " + length * height);
rectangle.close();
}
}
class Triangle {
public static void calculateTriangleArea() {
Scanner triangle = new Scanner(System.in);
System.out.println("Forneça o valor da base de seu triângulo:");
double base = triangle.nextDouble();
System.out.println("Forneça o valor da altura do seu triângulo:");
double height = triangle.nextDouble();
System.out.println("O valor da area do seu triângulo é:" + (height * base) / 2);
triangle.close();
}
}
I'd appreciate it so much if I could get some help. I'm still a beginner learning to program. It'd be largely appreciated!
EDIT: The non-essential parts of the code, aka the response and the questions are in Portuguese. For the error here's what it's saying -> Enter which of these figures' area you wish to calculate: circumference, triangle, circle, rectangle, trapezium, etc.
I enter: circle
It then leads to to the Circle class and asks: Enter the circle's radius ->
But before I can press anything the scanner's already closed and the error is in place.
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