我正在尝试返回一个变量“i”，它存储一个值在数组中的位置。我想返回“i”的值，以便其他类可以使用该值访问数组中的另一个值（这可能听起来有点笨）。我该怎么做？
import java .io.*;
public class Login{
public int i;
public void Menu1()throws IOException
{
int flag=0;
int goal=0;
String p;
String Username[]={"Mohit","Rahul","Mehul","Kevin","Tony"};
String MNumber[]={"8720765181","8659133560","9869206216","9767445692","9967129878"};
String Password[]={"1234","5678","9012","3456","7890"};
int Balance[]={20,124,256,67,512};
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
do
{
System.out.println("Enter your Username");
String username=br.readLine();
for(i=0;i<5;i++)
{
if(username.equals(Username[i])){
flag=1;
break;
}}
if(flag==1)
{
System.out.println("Enter your password");
p=br.readLine();
if(p.equals(Password[i]))
{
goal=1;
}
if(goal==1)
{
System.out.println("Password matched");
System.out.println("Welcome Mr."+Username[i]+".Your Registired Mobile number is "+MNumber[i]);
System.out.println("It has a balance of Rs."+Balance[i]+" which will expire on 20th August 2025");
goal=1;
Second_Menu sm=new Second_Menu();
sm.main();
}
else
System.out.println("Incorrect password,please retry");
}
else
System.out.println("incorrect username,please retry");
}while(goal!=1);
}
}
这是我要在其中调用值的类。
import java.io.*;
public class Recharge
{
public void recharge()throws IOException {
int Balance[]={20,124,256,67,512};
int chcea;
double recAmt=0;
double u;
int i=0;
InputStreamReader isr =new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(isr);
System.out.println("Choose an option");
System.out.println("1.Recharge your account");
System.out.println("2.Return to Main Menu");
chcea=Integer.parseInt(br.readLine());
System.out.println("You choose option number "+chcea+".Proceed(y or n)");
String answ=br.readLine();
switch(answ)
{
case "y":
switch(chcea)
{
case 1:System.out.println("For the first time India a Mobile Service Provider gives you the freedom to recharge with a coustom amount");
System.out.println("Please enter a recharge amount");
recAmt=Double.parseDouble(br.readLine());
System.out.println("Your entered amount is Rs."+recAmt+".Proceed(y or n)");
String optyn=br.readLine();
switch(optyn)
{
case "y":System.out.print("Please wait");
for(int wait=0;wait<=5;wait++);
{for(int tmp=0;tmp<=999999999;tmp++){}
System.out.print(".");
}
System.out.println("Your account has been successfully recharged.");
System.out.println("Your new Balance is Rs."+(Balance[i]+recAmt));
break;
case "n":break;
default:System.out.println("Please enter a valid choice");
break;
}
case 2 :Second_Menu sm= new Second_Menu();
sm.main();
break;
}
case"n":break;
}
}
}
我想从第一个类返回“i”的值，以便第二个类可以使用它为正确的用户访问数组“Balance []”中的值。我还希望在充值后余额的值该用户（i）更改为新的充值金额。