我正在尝试将我的单维数组转换为多维数组[5] [7]。我知道我必须将我的方法sortBySimpleInterest和displayInterest转换为接受单个多维数组而不是多个单维数组。通过将这两个方法转换为多维数组，我还必须更改计算以接受多维数组吗？我也对如何使用选择排序设置SortbySimpleInterest方法感到困惑。感谢您的帮助，我是java的新手
import java.util.Scanner;
public class InterestCalculatorBatchMDA {
public static void main(String[] args )
{
int cnt = 0;
double[][] arrPrincipalAmt = new double[5][7];
double[][] arrInterestRate = new double[5][7];
double[][] arrTerm = new double[5][7];
double[][] arrSimple = new double[5][7];
double[][] arrCompoundMonthly = new double[5][7];
double[][] arrCompoundDaily = new double[5][7];
double[][] arrCompoundWeekly = new double[5][7];
do{
arrPrincipalAmt[cnt] = getPrincipalAmount(1);
arrInterestRate[cnt] = getInterestRate(1);
arrTerm[cnt] = getTerm(1);
arrSimple[cnt] = round(calculateSimpleInterest(arrPrincipalAmt[cnt], arrInterestRate[cnt], arrTerm[cnt]),5);
arrCompoundMonthly[cnt] = round(calculateCompoundInterest(arrPrincipalAmt[cnt], arrInterestRate[cnt],arrTerm[cnt] ,12.0 ),5);
arrCompoundWeekly[cnt] = round(calculateCompoundInterest(arrPrincipalAmt[cnt], arrInterestRate[cnt], arrTerm[cnt], 52.0 ),5);
arrCompoundDaily[cnt] = round(calculateCompoundInterest(arrPrincipalAmt[cnt], arrInterestRate[cnt], arrTerm[cnt], 365.0 ),5);
cnt++;
}while (cnt < 5 && askYesNo("Enter another set of data (Yes/No):"));
displayInterest(arrPrincipalAmt,arrInterestRate,arrTerm,arrSimple,arrCompoundMonthly,arrCompoundWeekly,arrCompoundDaily,cnt);
sortBySimple(arrPrincipalAmt,arrInterestRate,arrTerm,arrSimple,arrCompoundMonthly,arrCompoundWeekly,arrCompoundDaily,cnt);
displayInterest(arrPrincipalAmt,arrInterestRate,arrTerm,arrSimple,arrCompoundMonthly,arrCompoundWeekly,arrCompoundDaily,cnt);
}
/** Round **/
public static double round(double numb1, double numb2) {
double round = ((double) Math.round(numb1*(Math.pow(10, numb2)))/(Math.pow(10, numb2)));;
return round;
}
/** Calculate Simple **/
public static double calculateSimpleInterest(double numb1, double numb2, double numb3) {
double calculateSimpleInterest = ((numb1)*(numb2/100.0)*(numb3/12.0));
return calculateSimpleInterest;
}
/** Calculate Compounded Daily **/
public static double calculateCompoundInterest(double numb1, double numb2, double numb3, double numb4 ) {
double calculateCompoundInterest = (numb1*Math.pow((1.0+((numb2/100.0)/numb4)),(numb4*(numb3/12.0))))-numb1;
return calculateCompoundInterest;
}
/** Get principal amount **/
public static double getPrincipalAmount(double numb1) {
Scanner input = new Scanner(System.in);
double numb2 = 1;
do{System.out.print("Enter Loan Amount: ");
numb2 = input.nextDouble();
if(numb2 > 0);
else{
System.out.println("Data Error: Loan amount must be greater than zero. You entered " +numb2);
}
}while (numb2 < 0);
return numb2;
}
/** Get interest rate **/
public static double getInterestRate(double numb1) {
Scanner input = new Scanner(System.in);
double numb2=1;
do{System.out.print("Enter Yearly Interest Rate (1 to 100 percent): ");
numb2 = input.nextDouble();
double getInterestRate = 0;
if (numb2 >= 0 && numb2 <= 100)
getInterestRate = numb2;
else{
System.out.println("Data Error: Interest rate must be greater than or equal to zero and less than or equal to 100. You entered " +numb2);
}
}while (numb2 <= 0 || numb2 >= 100);
return numb2;
}
/** Get term **/
public static double getTerm(double numb1) {
Scanner input = new Scanner(System.in);
double numb2=1;
do{System.out.print("Enter the Term (in months): ");
numb2 = input.nextInt();
double getTerm = 0;
if (numb2 > 0)
getTerm = numb2;
else{
System.out.println("Data Error: Loan amount must be greater than zero. You entered " +numb2);
}
}while (numb2 <= 0);
return numb2;
}
/** Sort by simple interest **/
public static void sortBySimple(double[][] arrPrincipalAmt ,double[][] arrInterestRate, double[][] arrTerm, double[][] arrSimple, double[][] arrCompoundMonthly, double[][] arrCompoundWeekly, double[][] arrCompoundDaily, double count){
for(int i = 0;i<count;i++)
{
for(int j=i+1; j<count;j++)
{
if(arrSimple[j]<arrSimple[i])
{
double temp = arrSimple[i];
arrSimple[i] = arrSimple[j];
arrSimple[j] = temp;
double temp1 = arrPrincipalAmt[i];
arrPrincipalAmt[i] = arrPrincipalAmt[j];
arrPrincipalAmt[j] = temp1;
double temp2 = arrInterestRate[i];
arrInterestRate[i] = arrInterestRate[j];
arrInterestRate[j] = temp2;
double temp3 = arrTerm[i];
arrTerm[i] = arrTerm[j];
arrTerm[j] = temp3;
double temp4 = arrSimple[i];
arrSimple[i] = arrSimple[j];
arrSimple[j] = temp4;
double temp5 = arrCompoundMonthly[i];
arrCompoundMonthly[i] = arrCompoundMonthly[j];
arrCompoundMonthly[j] = temp5;
double temp6 = arrCompoundDaily[i];
arrCompoundDaily[i] = arrCompoundDaily[j];
arrCompoundDaily[j] = temp6;
double temp7 = arrCompoundDaily[i];
arrCompoundDaily[i] = arrCompoundDaily[j];
arrCompoundDaily[j] = temp7;
}
}
}
}
/** Display Interest **/
public static void displayInterest(double[][] amt ,double[][] interest, double[][] term, double[][] simple, double[][] monthly, double[][] weekly, double[][] arrCompoundDaily, int count){
int i=0;
System.out.println("[Line #] [Principal Amount] [Interest Rate] [Term] [Simple Interest] [Compound Monthly] [Compound Weekly] [Compound Daily]");
do{
System.out.print((i+1)+" ");
System.out.print(amt[i]+" ");
System.out.print(+interest[i]+" ");
System.out.print(+ term[i]+" ");
System.out.print(+simple[i]+" ");
System.out.print(+monthly[i]+" ");
System.out.print(+weekly[i]+" ");
System.out.println(+arrCompoundDaily[i]);
i++;
}while(i < count);
}
/**ask yes or no **/
public static boolean askYesNo(String question) {
Scanner input = new Scanner(System.in);
String enteredText;
boolean isAnswerValid;
do{
isAnswerValid = false;
System.out.println(question);
enteredText = input.nextLine();
if (enteredText.length() > 0)
{
enteredText = enteredText.toUpperCase();
if(enteredText.equals("YES") || enteredText.equals("Y") || enteredText.equals("NO") || enteredText.equals("N"))
{
isAnswerValid = true;
}
}
if(isAnswerValid == false)
{
System.out.println("Please enter 'Yes' or 'No'?");
}
} while(isAnswerValid == false);
if(enteredText.equals("YES") || enteredText.equals("Y"))
{
return true;
}
return false;
}
}
答案 0 :(得分：1)
如果您可以将某个计算方案映射到单个结构，那么简单的解决方案就是使用一个类。
class InterestRateSource {
private Double firstFactor;
private Double secondFactor;
//etc
public InterestRateSource(Double firstFactor, Double secondFactor) {
this.firstFactor = firstFactor;
this.secondFactor = secondFactor;
};
public Double getFirstFactor() {
return this.firstFactor;
};
public Double getSecondFactor() {
return this.secondFactor;
};
};
// expand the above to account for all the variables of a single test case.
// Then simply use a List or whatever suitable collection.
List<InterestRateSource> myList = new ArrayList<InterestRateSource>();
myList.add(new InterestRateSource(5, 7));
myList.add(new InterestRateSource(3,4));
for (InterestRateSource currentRate: myList) {
// now you are iterating through the list. Do whatever calculations you need to do.
};