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编写一个NewLoan类,使满足以下要求:
如果年利率(AnnualInterestRate,AIR)、年数(NumOfYears,NOY)或贷款总额(LoanAmount,LA)任意一项小于或等于零,则抛出IllegalArgumentException异常,若有多项不符合要求,则以最前项为准,输出格式见范例;
如果数据均符合要求,构造printTotalPayment()方法,返回总额,结果保留3位小数。
输入格式:
输入有多组数据,一个实数表示年利率,一个整数表示年数,一个实数表示贷款总额。
输出格式:
若任意一项小于或等于零,抛出IllegalArgumentException异常及相应描述(Annual interest rate must be positive.或Number of years must be positive.或Loan amount must be positive.);
有多项不符合,以不符合最前项为准;
若均符合要求,按照格式输出总额。
输入样例:
1 1 1000
2.5 0 2000
0 0 0
输出样例:
totalPayment is 1005.424
java.lang.IllegalArgumentException: Number of years must be positive.
java.lang.IllegalArgumentException: Annual interest rate must be positive.
下面是我写的代码
- 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 {
- NewLoan m = new NewLoan(AIR, NOY, LA);
- System.out.printf(m.printTotalPayment());
- System.out.printf("\n");
- } catch (Exception ex) {
- System.out.println(ex);
- }
- }
- }
- }
- /* 请在这里填写答案 */
- class NewLoan{
- double a,c;
- int b;
- NewLoan(double air,int noy,double la) throws IllegalArgumentException {
- this.a=air;//年利率
- this.b=noy;//年数
- this.c=la;//贷款额
- judge();
- }
- public void judge() throws IllegalArgumentException{
- if(this.a<=0||(this.a<=0&&this.b<=0&&this.c<=0)){
- throw new java.lang.IllegalArgumentException("Annual interest rate must be positive.");
- }
- else if(this.b<=0){
- throw new java.lang.IllegalArgumentException("Number of years must be positive.");
- }
- else if(this.c<=0){
- throw new java.lang.IllegalArgumentException("Loan amount must be positive.");
- }
- }
- String printTotalPayment(){
- double sum=((this.a/1200.0)/(1-(1/Math.pow(1+this.a/1200.0,12))))*12.0*this.c*this.b;
- return "totalPayment is "+String.format("%.3f",sum);
- }
- }
- class IllegalArgumentException extends Exception{
- String r;
- IllegalArgumentException(String r){
- this.r=r;
- }
- @Override
- public String getMessage() {
- return this.r;
- }
- }
复制代码
代码中存在以下问题:
1. 在NewLoan类的构造方法中,只是调用了judge()方法进行判断,但没有在该方法中抛出异常。应该在judge()方法中使用if条件判断,当满足条件时,抛出IllegalArgumentException异常。
2. 在Main类的main方法中,使用了错误的方法签名,应该使用String[] args而不是String args。
下面是修改后的代码:
- 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 {
- NewLoan m = new NewLoan(AIR, NOY, LA);
- System.out.printf(m.printTotalPayment());
- System.out.printf("\n");
- } catch (IllegalArgumentException ex) {
- System.out.println(ex.getMessage());
- }
- }
- }
- }
- class NewLoan {
- private double AIR;
- private int NOY;
- private double LA;
- NewLoan(double air, int noy, double la) throws IllegalArgumentException {
- this.AIR = air;
- this.NOY = noy;
- this.LA = la;
- judge();
- }
- public void judge() throws IllegalArgumentException {
- if (this.AIR <= 0) {
- throw new IllegalArgumentException("Annual interest rate must be positive.");
- }
- if (this.NOY <= 0) {
- throw new IllegalArgumentException("Number of years must be positive.");
- }
- if (this.LA <= 0) {
- throw new IllegalArgumentException("Loan amount must be positive.");
- }
- }
- public String printTotalPayment() {
- double totalPayment = LA * Math.pow(1 + AIR / 100, NOY);
- return "totalPayment is " + String.format("%.3f", totalPayment);
- }
- }
复制代码
以上代码中,使用了私有变量来存储输入的年利率、年数和贷款总额,在judge()方法中进行判断,并抛出异常。printTotalPayment()方法计算总额,并返回格式化后的字符串。在Main类的main方法中,通过try-catch语句捕获异常并输出相应信息。
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