Question

我有这个项目要做，我必须设置一个菜单驱动的程序（eclipse中的java）。它不一定是GUI，它可以通过一系列system.out.println来完成，但这是我遇到问题的地方。除了设置部分，我完成了大部分代码。每个部分都必须有一个退出选项，程序本身有3个部分。第一个是从用户接收1到100的3个数字，第二个是按升序排列，第三个是查看数字是否可以形成三角形的边。我已完成第2步和第3步的代码，但无法使开始菜单部分工作。它需要是这样的，当用户输入1时，它会选择1,2，2和3，3，但选项2和3不能工作，除非选项1已经完成。这就是我到目前为止，我怎样才能让其余的工作？

import java.util.*;
import java.io.*;


public class Projcet  {


    static Scanner console = new Scanner(System.in);


    public static void main(String[] args) {
        // TODO Auto-generated method stub

        int A;
        int B;
        int C;
        int num1;
        int num2;
        int num3;
        int opt2;
        int opt3;
        int Exit;

        System.out.println("This program is used to determine if three integers between 1-100 can form the sides of a triangle");

        System.out.println("Enter your first number between 1 and 100");
        num1= console.nextInt();

        System.out.println("Enter your second number between 1 and 100");
        num2 = console.nextInt();

        System.out.println("Enter your third number between 1 and 100");
        num3 = console.nextInt();

        System.out.println("Select your next step");
        System.out.println("Do not select step 3 if step 2 is not completed");
        System.out.println("Exit");
        System.out.println("opt2-Order your number in ascending order");
        System.out.println("opt3-Determine if the three inputs form a triangle");
        opt3 = console.nextInt();
        opt2 = console.nextInt();
        Exit =
        opt2 = 




    public static void int(opt2)
            {   
    import javax.swing.JOptionPane;
    import java.util.*;
    public class projecttest
    {   public static void main(String[] args)
        {
            int num, i, j, temp;
            Scanner input = new Scanner(System.in);

            System.out.println("Enter the number of integers to sort:");
            num = input.nextInt();

            int array[] = new int[num];

            System.out.println("Enter " + num + " integers: ");

            for (i = 0; i < num; i++) 
              array[i] = input.nextInt();

            for (i = 0; i < ( num - 1 ); i++) {
              for (j = 0; j < num - i - 1; j++) {
                if (array[j] > array[j+1]) 
                {
                   temp = array[j];
                   array[j] = array[j+1];
                   array[j+1] = temp;
                }
              }
            }

            System.out.println("Sorted list of integers:");

            for (i = 0; i < num; i++) 
                System.out.println(array[i]);



    public staic void int(opt3)
    {
    import java.util.*;
    public class triangle {

         static Scanner console = new Scanner(System.in);

    public static void main(String[] args) {
    // TODO Auto-generated method stub

          int a;
          int b;
          int c;

          System.out.println("Enter a number for a");
          System.out.println("Enter a number for b");
          System.out.println("Enter a number for c");

            a = console.nextInt();
            b = console.nextInt();
            c = console.nextInt();

                if (a+b>c && a+c>b && b+c>a)
                    {   
                        System.out.print("TRIANGLE");
                    }
                else
                    {   
                        System.out.print("NO TRIANGLE");
                    }

            }


    }

Answer 1

你的第2部分＆amp;在使用第1部分时，3没有意义。但由于你只要求第1部分，我会假设你在解决第1部分之后会进行集成。

boolean opt1Done = false;
System.out.println("Select your next step");
System.out.println("1: Exit");
System.out.println("2: Order your number in ascending order");
System.out.println("3: Determine if the three inputs form a triangle");
int answer = console.nextInt();
if (answer == 1) {
    //do whatever for option 1
    opt1Done = true;
} else if (answer == 2) {
    if (opt1Done) {
        //...... do whatever to order the numbers
    } else {
        System.out.println("you must complete Step 1 before Step 2");
    }
} else if (answer == 3) {
    if (opt1Done) {
        //... do whatever to determine if triangle or not
    } else {
        System.out.println("you must complete Step 1 before Step 3");
    }
}

希望这有帮助。

无法设置菜单程序

1 个答案: