loan.java

还不错的java基本实例

import javax.swing.JOptionPane;
import java.text.NumberFormat;
public class Loan {
     public static void main( String args[] ){
                 final int MOMTHS_IN_YEAR  = 12;
                 float annualInterestRate ;
                 int loanPeriod,numberOfPayments ;
                 double loanAmount, monthlyPayment, totalPayment ;
                 double  monthlyInterestRate;
                 String output  = "";
           loanAmount =Double.parseDouble(JOptionPane.showInputDialog( "输入贷款数量"));
           annualInterestRate =Float.parseFloat(JOptionPane.showInputDialog( "输入年利率"));
           loanPeriod =  Integer.parseInt(JOptionPane.showInputDialog( "输入贷款周期"));
                 monthlyInterestRate = annualInterestRate / 100.0 / MOMTHS_IN_YEAR;
                 numberOfPayments = loanPeriod * MOMTHS_IN_YEAR;
                 monthlyPayment = (loanAmount * monthlyInterestRate) /
                         (1 - (Math.pow((1 + monthlyInterestRate), -numberOfPayments)));
                 totalPayment = monthlyPayment * numberOfPayments;
                NumberFormat currencyformatter=NumberFormat.getCurrencyInstance();
              NumberFormat formatter=NumberFormat.getNumberInstance();
              formatter.setMaximumFractionDigits(2);
         output ="贷款数量： "+formatter.format(loanAmount)+"\n"+
                "贷款周期： "+formatter.format(loanPeriod)+"\n"+
                 "年利率： "+formatter.format(annualInterestRate)+"\n"+
                 "月付款："+currencyformatter.format(monthlyPayment)+"\n"+
                 "总付款："+currencyformatter.format(totalPayment);
              JOptionPane.showMessageDialog(null, output,
                     "结果",JOptionPane.INFORMATION_MESSAGE);
             System.exit(0);
     }
}