定義一個貸款類Loan，其中有屬性：
annualInterestRate:double，表示貸款的年利率（默認(rèn)值：2.5）
numberOfYears:int，表示貸款的年數(shù)（默認(rèn)值：1）
loanAmount:double,表示貸款額（默認(rèn)值：100）
loanDate:java.util.Date,表示創(chuàng)建貸款的日期
定義方法：
（1）默認(rèn)的無參構(gòu)造方法
（2）帶指定利率、年數(shù)和貸款額的構(gòu)造方法
（3）所有屬性的get/set方法
（4）返回這筆貸款的月支付額getMonthlyPayment()
月支付額 = (貸款額度月利率)/(1-(1/Math.pow(1+月利率,年數(shù)12)))
（5）返回這筆貸款的總支付額getTotalPayment()
總支付額度 = 月支付額度年數(shù)12

附上如下的測試類。

public class Main{public static void main(String[] args) {Scanner input = new Scanner(System.in);while (input.hasNext()) {double AIR = input.nextDouble();int NOY = input.nextInt();double LA = input.nextDouble();try {Loan m = new Loan(AIR, NOY, LA);System.out.printf("%.3f\n",m.getTotalPayment());} catch (Exception ex) {System.out.println(ex);}}} }

輸入格式:
輸入有多組數(shù)據(jù)，一個實(shí)數(shù)表示年利率，一個整數(shù)表示年數(shù)，一個實(shí)數(shù)表示貸款總額。

輸出格式:
若任意一項(xiàng)小于或等于零，拋出IllegalArgumentException異常及相應(yīng)描述（Number of years must be positive或Annual interest rate must be positive或Loan amount must be positive）；有多項(xiàng)不符合，以不符合最前項(xiàng)為準(zhǔn)；

若均符合要求，按照格式輸出總額。

輸入樣例:
在這里給出一組輸入。例如：

1 1 1000 2.0 0 2000 0 0 0

輸出樣例:
在這里給出相應(yīng)的輸出。例如：

1005.425
java.lang.IllegalArgumentException: Number of years must be positive
java.lang.IllegalArgumentException: Annual interest rate must be positive

import java.util.Date; import java.util.Scanner; public class Main{public static void main(String[] args) {Scanner input = new Scanner(System.in);while (input.hasNext()) {double AIR = input.nextDouble();int NOY = input.nextInt();double LA = input.nextDouble();try {Loan m = new Loan(AIR, NOY, LA);if (AIR<=0)throw new IllegalArgumentException("Annual interest rate must be positive");else if (NOY<=0)throw new IllegalArgumentException("Number of years must be positive");else if (LA<=0)throw new IllegalArgumentException("Loan amount must be positive");System.out.printf("%.3f\n",m.getTotalPayment());} catch (Exception ex) {System.out.println(ex);}}} }class Loan{private double annualInterestRate;private int numberOfYear;private double loanAmount;private Date loanDate;public Loan() {annualInterestRate=2.5;numberOfYear=1;loanAmount=100;this.loanDate=new Date();//沒啥用}public Loan(double annualInterestRate, int numberOfYear, double loanAmount) {this.annualInterestRate = annualInterestRate;this.numberOfYear = numberOfYear;this.loanAmount = loanAmount;}public double getAnnualInterestRate() {return annualInterestRate;}public void setAnnualInterestRate(double annualInterestRate) {this.annualInterestRate = annualInterestRate;}public int getNumberOfYear() {return numberOfYear;}public void setNumberOfYear(int numberOfYear) {this.numberOfYear = numberOfYear;}public double getLoanAmount() {return loanAmount;}public void setLoanAmount(double loanAmount) {this.loanAmount = loanAmount;}public Date getLoanDate() {return loanDate;}public void setLoanDate(Date loanDate) {this.loanDate = loanDate;}public double getMonthlyPayment(){double monthRate=annualInterestRate/1200;//注意年利率=月利率/1200;return loanAmount*monthRate/(1-(1/Math.pow(1+monthRate,numberOfYear*12)));}public double getTotalPayment(){return getMonthlyPayment()*12*numberOfYear;} }

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