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java - 带循环的天文学助手 Java 菜单驱动程序

转载 作者:行者123 更新时间:2023-12-01 13:50:40 24 4
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我试图制作一个程序让用户选择一个行星,它会显示该行星的特征。

我希望能够将其循环回菜单,只要他们选择“5”来结束程序,并且还验证选择为 1-5。

但是我有一些错误,我不知道如何消除。

import java.util.Scanner;

public class AstronomyHelper
{

public static void main(String[] args)
{

//Declare a variable to hold the user's menu selection
int menuSelection;

//Declare a variable to hold the different planets
string Mercury, Venus, Earth, Mars;


//Create a scanner object for the keyboard input
Scanner keyboard = new Scanner(System.in);


do
{
//Display the menu and get the user's selection
displayMenu(menuSelection);


//Display the information for the user's selection
switch(menuSelection)
{

case 1:
System.out.println("\t\t\t\t\t\t\t\t\t\t MERCURY");
System.out.println("_________________________________________________________");

System.out.println("Average Distance from the sun: 57.9 million kilomenters");
System.out.println("Mass: 3.31 x 10^23 kg");
System.out.println("Surface Temperature: -173 to 430 degrees Celsius");

break;


case 2:
System.out.println("\t\t\t\t\t\t\t\t\t\t VENUS");
System.out.println("_________________________________________________________");

System.out.println("Average Distance from the sun: 108.2 million kilometers");
System.out.println("Mass: 4.87 x 10^24 kg");
System.out.println("Surface Temperature: 472 degrees Celsius");

break;

case 3:
System.out.println("\t\t\t\t\t\t\t\t\t\t EARTH");
System.out.println("_________________________________________________________");

System.out.println("Average Distance from the sun: 149.6 million kilometers");
System.out.println("Mass: 5.967 x 10^24 kg");
System.out.println("Surface Temperature: -50 to 50 degrees Celsius");

break;

case 4:
System.out.println("\t\t\t\t\t\t\t\t\t\t MARS");
System.out.println("_________________________________________________________");

System.out.println("Average Distance from the sun: 227.9 million kiometers");
System.out.println("Mass: 0.6424 x 10^24 kg");
System.out.println("Surface Temperature: -140 to 20 degrees Celsius");

break;

}

while(menuSelection !=5)
}



//Call the displayMenu method to display the menu options and get the user's selection
public displayMenu()
{
System.out.println("Please select a planet to view details about it's: ");
System.out.println("average distance from the sun, mass, and surface temperature.");
System.out.println("-------------------------------------------------------------");
System.out.println("1. Mercury");
System.out.println("2. Venus");
System.out.println("3. Earth");
System.out.println("4. Mars");
System.out.println("5. EXIT the program");
System.out.println("Enter your selection: ");

menuSelection = keyboard.nextInt();


//Validate the menu selection
while (menuSelection < 1 || menuSelection > 5)
{
System.out.print("This is an invalid selection.");
System.out.print("Enter a selection from 1-5: ");

menuSelection = keyboard.nextInt();
}
}
}

最佳答案

  public displayMenu() // there must be a return type and int parameter

如果您在 displayMenu() 方法中访问 Scanner 对象,则必须在 main() 之外声明它们。

而且您也没有正确关闭 do-while 循环。

关于java - 带循环的天文学助手 Java 菜单驱动程序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19985976/

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