这是我的问题。我正在尝试在我的main中构建一个HomeLoan数组，然后从我的main，从我的main调用printHLoans（hLoans），以便我可以列出它们然后添加更多功能。不幸的是，它说无法将hLoan解析为变量。
主类
import java.util.InputMismatchException;
import java.util.Scanner;
public class LoanTest
{
static int term;
static int loanID=0;
static int hHowMany=0;
static int cHowMany=0;
public static void main(String[] args)
{
Scanner input = new Scanner (System.in);
System.out.print("Enter name: ");
String name = input.nextLine();
System.out.print("Enter Customer ID: ");
int custID=0;
do
{
try
{
custID = input.nextInt();
}
catch (InputMismatchException e)
{
System.out.println("Customer IDs are numbers only");
input.next();
}
}while (custID<1);
boolean aa=true;
while(aa)
{
System.out.println("Do you have a (h)ome loan or a (c)ar loan?");
String a = input.next();
switch (a)
{
case "h": System.out.println("You selected Home Loan");
System.out.println("How many Home Loans would you like to enter?");
hHowMany = input.nextInt();
HomeLoan[] hLoans = new HomeLoan[hHowMany];
int z=0;
while (hHowMany>z)
{
hLoans[z] = new HomeLoan(name, custID);
z++;
}
break;
case "c": System.out.println("You selected Car Loan");
System.out.println("How many Car Loans would you like to enter?");
cHowMany = input.nextInt();
int x=0;
CarLoan[] carLoans = new CarLoan[cHowMany];
while (x<cHowMany)
{
System.out.print("Enter Loan ID: ");
loanID=0;
do
{
try
{
loanID=input.nextInt();
}
catch (InputMismatchException e)
{
System.out.println("Loan IDs are number only");
input.next();
}
}while (loanID<1);
boolean b=true;
while(b)
{
System.out.print("Enter term: ");
term=input.nextInt();
boolean t = CarLoan.termCorrect(term);
if(t){System.out.println("Error: Maximum of 6 year");}
else {b=false; System.out.println("You entered: " + term + " years");}
}
carLoans[x] = new CarLoan(name, custID, loanID, term);
x++;
}
break;
default: System.out.println("Invalid input");
break;
}
System.out.print("Would you like to enter another loan?");
System.out.print("(y)es or (n)o:");
String m = input.next();
System.out.println("");
switch (m)
{
case "y": break;
case "n": aa=false;
break;
default: System.out.print("Invalid entry");
}
}
printHLoans(hLoans);
System.out.println("Thank you for using Loan Software");
System.out.println("Have a nice day");
}
public static void printHLoans(HomeLoan hLoans[])
{
System.out.println("Here are the loans you entered . . .");
int zzz=0;
while (zzz<hHowMany)
{
term = hLoans[zzz].getTerm();
loanID=hLoans[zzz].getLoanID();
String address=hLoans[zzz].getAddress();
double loanAmount = hLoans[zzz].getLoanAmount();
System.out.print(zzz + ": ");
System.out.print(hLoans[zzz].toString(loanID, address, term, loanAmount));
System.out.println();
zzz++;
}
}
}
HomeLoan Class
import java.util.InputMismatchException;
import java.util.Scanner;
public class HomeLoan extends Loan
{
private String address;
int howMany;
private double loanAmount;
private int term;
private int loanID;
public HomeLoan()
{
}
public HomeLoan(String name, int custID)
{
//super(name, custID, loanID);
Scanner input = new Scanner (System.in);
System.out.print("Enter Loan ID: ");
loanID=0;
do
{
try
{
loanID=input.nextInt();
}
catch (InputMismatchException e)
{
System.out.println("Loan IDs are number only");
input.next();
}
}while (loanID<1);
boolean l=true;
while (l)
{
System.out.print("Enter term: ");
term=input.nextInt();
boolean s = HomeLoan.termCorrect(term);
if (s){System.out.println("Error: Maximum of 30 years");}
else {l=false;}
}
//System.out.println();
input.nextLine();
System.out.print("Enter your address: ");
address=input.nextLine();
System.out.print("Enter loan ammount: ");
loanAmount = input.nextDouble();
double annualInterest = 10.99;
double monthlyPayment = amortization(loanAmount, annualInterest, term);
double newBalance=payment(monthlyPayment, loanAmount);
//System.out.println("Payment: " + monthlyPayment);
//System.out.println("New balance after payment: " + newBalance);
}
public static boolean termCorrect(int term)
{
boolean a;
if (term>30) {a=true; return a;}
else {a=false; return a;}
}
public String toString(String name, int custID, int loanID)
{
String display = "Name: " + name + " Customer ID: " + custID + " Address: "+ address+ " Loan ID: " + loanID + " Loan Amount: $" + loanAmount
+ " Current Balance: $";
return display;
}
public String getAddress()
{
return address;
}
public double getLoanAmount()
{
return loanAmount;
}
public int getTerm()
{
return term;
}
public int getLoanID()
{
return loanID;
}
public String toString(int loanID, String address, int term, double loanAmmount)
{
String displa = "ID: " + loanID + " Address:" + address + " Term: " + term + " Loan Ammount: " + loanAmmount;
return displa;
}
private void equals()
{
}
public void printHLoans(HomeLoan hLoans[], int xxx)
{
}
}
我如何使这项工作？
答案 0 :(得分：1)
那是因为您已在HomeLoan[] hLoans = new HomeLoan[hHowMany];循环中声明了while，并在此之后尝试访问它。这就是为什么一旦while循环结束，hLoans超出范围。在您的情况下，更具体地说，它在case "h"的{{1}}范围内，这进一步缩小了switch范围内的范围。
为了能够在hLoans之外访问它，您需要在高于while的范围内声明它。做这样的事。
while