JAVA如何在Java中使用另一个作用域中的变量创建方法

我在空闲时间开始编写自己的Java程序，称为“订票机”，它是一个没有GUI的Java控制台程序。它会询问您的全名、常客ID、年龄，然后将您与指定的航空公司和航班号进行匹配。当你旅行时，你的燃料会减少，当它着陆时，燃料会充满（我将为此创建一个填充方法）。我在从范围外调用方法时遇到问题

目前我有两个文件：

Flights.java

-->启动文件。链接到flightUserDatabase

flightUserDatabase.java

-->包含所有方法和类/蓝图所有用户名、年龄、frequentFlyer等

Flights.java中的代码：

import java.io.Console;

public class Flights {

    public static void main (String[] args) {
      Console console = System.console();
      //Book a Ticket Machine
      //From Database otherwise Name not found on Database. Put Database in Another Class. Call it flightUserDatabase.
      /* firstName: DONE
         lastName: DONE
         frequentFlyerID: Otherwise Invalid Number parseInt
         Age: parseInt
         FUEL MINUS AND FUEL ADD WHEN LAND.
      */

      flightUserDatabase database = new flightUserDatabase();

      System.out.println("Enter Creditials:  ");
      database.getDatabase();

      String airline = console.readLine("ENTER YOUR AIRLINE:  ");
      String flightNumber = console.readLine("ENTER YOUR FLIGHT NUMBER:  ");
      String gate = "B7"; /* Declare data type String called "gate" */ 
     //Next Version, Generate Random Number

      System.out.println("This is an automated system. Please Wait...");
      System.out.printf("%s %s is Departuring @ Gate:%s \n", airline, flightNumber, gate); /* Use printf from java.io.Console library, then output Gate and Flight Number */



      /* Notes: Data Types
      > String name = "Ohm";
      > int age = 42;
      > double score = 95.5;
      > char group = 'F';
      */
    }

}

来自flightUserDatabase.java的代码

import java.io.Console;
  //Book a Ticket Machine

class flightUserDatabase {
    Console console = System.console();
    public String fullName;

    public boolean getDatabase() {
    boolean namesInDatabase;
    do {
    fullName = console.readLine("ENTER YOUR FULLNAME:  ");
    namesInDatabase = (fullName.equals("Ohm Passavudh") || fullName.equals("Matt"));

    if (!namesInDatabase) {
      console.printf("Sorry, that name is not in our database yet. \n");
    }
    if (namesInDatabase) {
      console.printf("Welcome, Mr. %s \n", fullName); 
    }
    } while(!namesInDatabase);
    return namesInDatabase;
    }
    //If Ohm: FFID = 1234569 
    //If Matt: FFID = 246810
    //FFID == FrequentFlyerID
    /* Get name from inside scope fullName namesInDatabase variable  */


      public boolean frequentFlyerID()


I HAVE PROBLEMS HERE!!! I WANT TO SET Ohm's FFID to 1234569. But how to I determine if the user enters Ohm or Matt. I cannot access the String fullName from the other scope. I hope you understand me. If there is any misunderstanding I can clarify. 
 }

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首先，请做好你的格式化工作，读那些代码太糟糕了

您可以在flightUserDatabase中创建一个类字段和一个getter，以便在确定名称在数据库中后获得该名称

或者可以使用getDatabase（）返回它

像这样

public String getDatabase()
{
  String fullName;
  ...
  return fullName;
}

毕竟，您没有使用布尔值

。。。或者这个

class flightUserDatabase
{
  private String fullName = "";
  ...
  public String getName()
  {
    return this.fullName;
  }
}

您必须初始化变量

公共字符串fullName->
公共字符串fullName=“”

格式化代码的工作

名称类在您的案例FlightUserDatabase中从上符号开始

记住封装（私有变量）

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不可读的代码。我建议作为初学者，你应该更多地考虑风格、可读性和分解。对象应该做好一件事。FlightDatabase不应执行I/O操作或提示用户输入。乘客舱在哪？你需要一个。