Java---计算机贷款支付额计算(用对话框实现)

• 本例演示如何编写程序来计算贷款支付问题。
• 下面是编写程序的步骤：
• 1.提示用户输入年利率、年数和贷款总额
• 2.利用年利率算出月利率
• 3.通过前面的公式计算月支付额。
• 4.计算总支付额，它是月支付额乘以12再乘以年数。
• 5.在消息对话框中显示月支付额和总支付额。

package cn.hncu.Chapter2;

import javax.swing.JOptionPane;

/**
 * @author hncu_chx
 *
 * Mylove amin
 * 
 */
public class ComputeLoan { public static void main(String[] args) { //Enter yearly interest rate开始的年利率 String annualInterestRateString = JOptionPane.showInputDialog("Enter yearly " + "interest rate,for example 8.25:"); //Convert转换… string to double double annualInterestRate = Double.parseDouble(annualInterestRateString); //Obtain获得 monthly每月的 interest rate利息率 double monthlyInterestRate = annualInterestRate/1200; //Enter number of years  String numberOfYearsString =JOptionPane.showInputDialog("Enter number of years as an integer," + "\nfor example 5:"); //Convert转换 string to int  int numberOfYears = Integer.parseInt(numberOfYearsString); //Enter开始 loan借款 amount总额 String loanString = JOptionPane.showInputDialog("Enter loan amount," + "for example 120000.95:"); //Convert string to double double loanAmount = Double.parseDouble(loanString); //Calculate 计算 payment付款，支付；报酬 double monthlyPayment = loanAmount * monthlyInterestRate/(1-1/Math.pow(1+monthlyInterestRate, numberOfYears*12)); double totalPayment = monthlyPayment*numberOfYears*12; //Format格式 to keep tow digits位数 数字 after the decimal小数 point点 //格式保留小数点后两位数 monthlyPayment = (int )(monthlyPayment *100)/100.0; totalPayment = (int)(totalPayment *100)/100.0; //Display显示 results结果 成绩  String output = "The monthly payment is "+monthlyPayment+ "\nThe total payment is "+totalPayment; JOptionPane.showMessageDialog(null, output); }

}
  

 

  
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注意：如果在输入对话框中点击取消，无字符串返回，系统会出现运行时错误。

文章来源: chenhx.blog.csdn.net，作者：谙忆，版权归原作者所有，如需转载，请联系作者。

原文链接：chenhx.blog.csdn.net/article/details/50355579