我正在编写一个程序，允许用户创建任意数量的贷款，将贷款存储在一个数组中，然后再对这些贷款进行处理，例如摊销和支付。我的问题是我找不到删除Main中冗余代码的方法。如果我创建一个“getLoanInfo”方法，那么我的HomeLoan对象在Main中不存在。如何删除冗余？我最终将循环代码，以便用户可以回到开头并再次选择一种贷款，并在需要时添加更多。
public static void main(String[] args) throws IOException {
System.out.println("Welcome to the Loan system! \n");
System.out.println("What type of Loan do you want? ");
System.out.println("Please enter 'H' for Home or 'C' for Car: ");
for(int i = 0; i < 5; i++){
char c = scan.next().charAt(0);
if(c == 'H'){
System.out.println("\nHow many Home Loans would you like? ");
HomeCount = scan.nextInt();
for(int j = 0; j < HomeCount; j++){
System.out.println("Please enter your Name: ");
String nameOf = scan.next();
System.out.println("Please enter an ID Number: ");
String id_Number = scan.next();
System.out.println("Please enter a Loan Number: ");
String loan_Number = scan.next();
System.out.println("Please enter the amount of the Loan: ");
double loan_Amount = scan.nextDouble();
System.out.println("Please enter your desired Interest Rate: ");
double interest_rate = scan.nextDouble();
while(interest_rate > 100.00){ //Check valid number
System.out.println("Invalid percentage. Please enter 0.00 - 100.00");
interest_rate = scan.nextDouble();
}
System.out.println("How long will you like the loan? Please enter 1-30.");
int term = scan.nextInt();
while(term > 30){ // Check for valid number
System.out.println("Invalid number of years. Please enter 1-30.");
term = scan.nextInt();
}
System.out.println("Current balance is being set to the Loan amount: ");
double c_balance = loan_Amount;
System.out.println("Please enter an address for the Home: ");
String address = scan.next();
HL[j] = new HomeLoan(nameOf,id_Number,loan_Number,loan_Amount,
interest_rate,term,c_balance,address);
}
new TestingClasses().getInfo(); //was trying a getInfo method
System.out.println("Would you like to view your loan? ");
char x = scan.next().charAt(0);
if( x == 'Y'){
System.out.println(HL); //When using getInfo method HL is not in scope
}
}
if(c == 'C'){
System.out.println("\nHow many Car Loans would you like? ");
CarCount = scan.nextInt();
CarLoan[] CL = new CarLoan[CarCount];
for(int j = 1; j < CarCount; j++){ //Loop through loans
System.out.println("Please enter your Name: ");
String name = scan.next();
System.out.println("Please enter an ID Number: ");
String id_number = scan.next();
System.out.println("Please enter a Loan Number: ");
String loan_number = scan.next();
System.out.println("Please enter the amount of the Loan: ");
double loan_amount = scan.nextDouble();
System.out.println("Please enter your desired Interest Rate: ");
double interest_rate = scan.nextDouble();
while(interest_rate > 100.00){ //Check valid number
System.out.println("Invalid percentage. Please enter 0.00 - 100.00");
interest_rate = scan.nextDouble();
}
System.out.println("How long will you like the loan? Please enter 1-30.");
int term = scan.nextInt();
while(term > 30){ // Check for valid number
System.out.println("Invalid number of years. Please enter 1-30.");
term = scan.nextInt();
}
System.out.println("Current balance is being set to the Loan amount. ");
double c_balance = loan_amount;
System.out.println("Please enter the Make of the car: ");
String make = scan.next();
System.out.println("Please enter the Model of the car: ");
String model = scan.next();
System.out.println("Please enter the Year of the car: ");
String year = scan.next();
CL[j] = new
CarLoan(name,id_number,loan_number,loan_amount,interest_rate,
term,c_balance,make,model,year);
}
}
答案 0 :(得分：0)
如果我创建一个方法“getLoanInfo”，那么我的HomeLoan对象在Main中不存在。
为什么你不能这样做
public static void main(String[] args){
HomeLoan homeLoan = new HomeLoan();
getLoanInfo(homeLoan);
}
public static void getHomeInfo(HomeLoan homeloan){
... // get loan info
}
只需在方法
中添加HomeLoan arg即可
答案 1 :(得分：0)
有很多方法。以下就是这样一种方式。对于样本，我将所有内容都放在一个类中。您可以将此视为消除冗余的选项之一。
import java.io.IOException;
import java.util.Scanner;
abstract class Loan
{
};
class HomeLoan extends Loan
{
String loan_Number;
public HomeLoan(String nameOf, String id_Number, String loan_Number,
double loan_Amount, double interest_rate, int term,
double c_balance, String address) {
// TODO Auto-generated constructor stub
this.loan_Number=loan_Number;
}
public String getHomeLoanNumber()
{
return "THIS IS HomeLoan Object:"+loan_Number;
}
}
class CarLoan extends Loan
{
String loan_Number;
public CarLoan(String name, String id_number, String loan_number,
double loan_amount, double interest_rate, int term,
double c_balance, String make, String model, String year) {
this.loan_Number=loan_number;
}
public String getCarLoanNumber()
{
return "THIS IS CarLoan Object:"+loan_Number;
}
}
public class Test {
private static Loan getLoanInfo(Scanner scan,char c)
{
System.out.println("Please enter your Name: ");
String nameOf = scan.next();
System.out.println("Please enter an ID Number: ");
String id_Number = scan.next();
System.out.println("Please enter a Loan Number: ");
String loan_Number = scan.next();
System.out.println("Please enter the amount of the Loan: ");
double loan_Amount = scan.nextDouble();
System.out.println("Please enter your desired Interest Rate: ");
double interest_rate = scan.nextDouble();
while(interest_rate > 100.00){ //Check valid number
System.out.println("Invalid percentage. Please enter 0.00 - 100.00");
interest_rate = scan.nextDouble();
}
System.out.println("How long will you like the loan? Please enter 1-30.");
int term = scan.nextInt();
while(term > 30){ // Check for valid number
System.out.println("Invalid number of years. Please enter 1-30.");
term = scan.nextInt();
}
System.out.println("Current balance is being set to the Loan amount: ");
double c_balance = loan_Amount;
if(c=='H')
{
System.out.println("Please enter an address for the Home: ");
String address = scan.next();
return new HomeLoan(nameOf,id_Number,loan_Number,loan_Amount,
interest_rate,term,c_balance,address);
}
else if(c=='C')
{
System.out.println("Please enter the Make of the car: ");
String make = scan.next();
System.out.println("Please enter the Model of the car: ");
String model = scan.next();
System.out.println("Please enter the Year of the car: ");
String year = scan.next();
return new CarLoan(nameOf,id_Number,loan_Number,loan_Amount,interest_rate,
term,c_balance,make,model,year);
}
else
return null;
}
public static void main(String[] args) throws IOException {
int HomeCount,CarCount;
HomeLoan HL[]=null;
CarLoan CL[];
System.out.println("Welcome to the Loan system! \n");
System.out.println("What type of Loan do you want? ");
System.out.println("Please enter 'H' for Home or 'C' for Car: ");
Scanner scan=new Scanner(System.in);
for(int i = 0; i < 5; i++){
char c = scan.next().charAt(0);
if(c == 'H'){
System.out.println("\nHow many Home Loans would you like? ");
HomeCount = scan.nextInt();
HL= new HomeLoan[HomeCount];
for(int j = 0; j < HomeCount; j++){
HL[j]=(HomeLoan)getLoanInfo(scan,c);
System.out.println(HL[j].getHomeLoanNumber());
}
System.out.println("Would you like to view your loan? ");
char x = scan.next().charAt(0);
if( x == 'Y'){
System.out.println(HL); //When using getInfo method HL is not in scope
}
}
if(c == 'C'){
System.out.println("\nHow many Car Loans would you like? ");
CarCount = scan.nextInt();
CL = new CarLoan[CarCount];
for(int j = 0; j < CarCount; j++){ //Loop through loans
CL[j]=(CarLoan)getLoanInfo(scan,c);
System.out.println(CL[j].getCarLoanNumber());
}
}
}
}
}