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我正在尝试做一个作业问题，将极坐标转换为笛卡尔坐标，反之亦然，使用继承和多态性，这也给出了点之间的距离、线的斜率和线的方程，给定输入的两个值用户。

我创建了我的父类，以及 Polar 和 Cartesian 类。我正在尝试 1. 调用我的测试坐标类中的方法（由于某种原因它无法识别），以及 2. 创建一个成功的嵌套循环。

循环情况：我有一个 if 语句导致输入极坐标或笛卡尔坐标。这很好用，一旦输入坐标，就会提示用户选择一个过程（获取线的斜率、线的方程、线之间的距离等）。我不知道如何创建这个嵌套循环。每次我尝试时，一旦我完成内循环，它就会停止循环，并且不会返回到菜单的外循环。

任何见解将不胜感激！

父代码（我无法调用这些方法）：

public abstract class Coordinate {

    private double value1, value2;

    public Coordinate(double val1, double val2) {
        this.value1 = value1;
        this.value2 = value2;
    }

    public double getValue1() {
        return value1;
    }
    public double getValue2() {
        return value2;
    }

    public abstract String getEquationOfLine(Coordinate c);

    public abstract double getDistance(Coordinate c);

    public abstract double getSlopeOfLine(Coordinate c);


}

代码：

import java.util.Scanner;


public class TestCoordinates {

    public static String getSelection(Scanner in) {

        System.out.println("(p) Polar Coordinates (r, theta (degrees))");
        System.out.println("(c) Cartesian Coordinates (x, y)");
        System.out.println("(x) Exit program");
        System.out.println("What type of coordinates?  Please enter p or c, or x to quit. ");
        return in.next();

    }

    public static void main(String [] args) {
        Scanner scan = new Scanner(System.in);

        String coordinateString = getSelection(scan);

        while(coordinateString.equalsIgnoreCase("p") || coordinateString.equalsIgnoreCase("c")) {


            if (coordinateString.equalsIgnoreCase("p")) {
                System.out.println("Coordinate 1 - Please enter the radius: ");
                int radius = scan.nextInt();
                System.out.println("Coordinate 1 - Please enter theta (degrees): ");
                int theta = scan.nextInt();
                System.out.println("Coordinate 2 - Please enter the radius: ");
                int radius1 = scan.nextInt();
                System.out.println("Coordinate 2 - Please enter theta (degrees): ");
                int theta1 = scan.nextInt();

                System.out.println("[1] Convert to Cartesian coordinates.");
                System.out.println("[2] Find the distance between the two points.");
                System.out.println("[3] Find the slope of the line between the points.");
                System.out.println("[4] Find the equation of the line between the points.");
                System.out.println("[5] Return to main menu.");

                System.out.println("What would you like to do? Enter the number: ");
                int num = scan.nextInt();





        /*if (num = 1) {
                    getCartesian();
                    System.out.println("The Cartesian coordinate for " + "(" + radius + "," + theta + ") is" + getCartesian);
                    System.out.println("The Cartesian coordinate for " + "(" + radius1 + "," + theta1 + ") is" + getCartesian);
                }*/

                /*if (int num = 2){
                    getDistance();
                    System.out.println("The distance between the Polar coordinates (" + radius + "," + theta + ") and " + radius1 +"," + theta1 + ") is" getDistance);
                }


                if (int num = 3) {
                    getSlopeOfLine;
                    System.out.println("The slope of the line between the Polar coordinates (" + radius + "," + theta + ") and " + radius1 +"," + theta1 + ") is" getSlopeOfLine);

                }

                if (int num = 4) {
                    System.out.println("The equation of the line between the points is: ")
                }

                else if (num = 5) {
                    return;
                }*/
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