在 java 中扫描的问题

问：

我接到一个任务，我必须计算给定对象的周长和面积，这是由用户确定的，并附带数据 - 边长、半径等。要做到这一点，我必须按照老师说的做一个“GUI”，要做到这一点，我必须使用扫描仪。

根据 NetBeans 的说法，每次我尝试进行第二次扫描时，在用户选择我们正在处理的对象之后，当它到达用户应该输入有关其对象的数据的部分时，它总是崩溃，并出现 java.util.NoSuchElementException 错误。我浏览了它，甚至在工作的扫描仪中复制了它，但无济于事。

以下是完整的代码：

package Methods2;
import java.util.Scanner;
public class Methods2 {
public static void main(String[] args) {
    //initialization
    int decider;
    Scanner input1;
    
    //defining
    input1 = new Scanner(System.in);
    System.out.println("Choose from these options to find the perimeter and area of any of these:\n1. Circle\n2. Square\n3. Rectangle");
    decider = input1.nextInt();
    input1.close();
    
    //decision
    if (decider == 1) {
        circle();
    } else if (decider == 2) {
        square();
    } else if (decider == 3) {
        rectangle();
    } else {
        System.out.println("There aren't any other options, other than these three.");
    }
}
public static void circle() {
    //method specific initialization
    int radius;
    double pi;
    double perimeter;
    double area;
    Scanner input2;
    
    //define
    pi = 3.14;
    input2 = new Scanner(System.in);
    System.out.println("Please type in the radius of the circle!");
    radius = input2.nextInt(); //these are where my problem's lie
    input2.close();
    
    //calculate
    perimeter = 2 * radius * pi;
    area = radius * radius * pi;
    
    //print
    System.out.println("The perimeter of this circle is: " + perimeter);
    System.out.println("The area of this circle is: " + area);
}
public static void square() {
    //method specific initialization
    int a;
    int perimeter;
    int area;
    Scanner input3;
    
    //define
    input3 = new Scanner(System.in);
    System.out.println("Please type in one side's length of the square!");
    a = input3.nextInt(); //these are where my problem's lie
    input3.close();
    
    //calculate
    perimeter = 4 * a;
    area = a * a;
    
    //print
    System.out.println("The perimeter of this circle is: " + perimeter);
    System.out.println("The area of this circle is: " + area);
}
public static void rectangle() {
    //method specific initialization
    int a;
    int b;
    int perimeter;
    int area;
    Scanner input4;
    
    //define
    input4 = new Scanner(System.in);
    System.out.println("Please type in one of the sides' length of the rectangle!");
    a = input4.nextInt(); //these are where my problem's lie
    System.out.println("Now type the other, non-equal side, compared to the previous one!");
    b = input4.nextInt(); //these are where my problem's lie
    input4.close();
    
    //calculate
    perimeter = 2 * (a + b);
    area = a * b;
    
    //print
    System.out.println("The perimeter of this circle is: " + perimeter);
    System.out.println("The area of this circle is: " + area);
}
}

我曾想过它是多个 Scanner，但在我意识到，变量不会在方法之间转移，除非它们在类中定义，否则它很快就被当作理论抛弃了。此外，NetBeans 没有标记该行的任何问题，因此它对我来说更没有意义。