loancalculator.java

还不错的java基本实例

public class LoanCalculator {
     private double loanAmount; //声明字段 loanAmount
     private int loanPeriod;//声明字段 loanPeriod
     private float annualInterestRate;//声明字段  annualInterestRate
    //声明读取属性LoanAmount的值方法
    public double getLoanAmount(){
        return loanAmount;
    }
    //声明设置属性LoanAmount的值的方法
    public void setLoanAmount(double newloanAmount){
         loanAmount=newloanAmount;
    }
     //声明设置属性LoanPeriod的值的方法
    public void setLoanPeriod(int newLoanPeriod){
          loanPeriod=newLoanPeriod;
    }
     //声明读取属性LoanPeriod的值的方法
    public int getLoanPeriod(){
        return loanPeriod;
    }
       //声明读取属性AnnualInterestRate的值的方法
     public float getAnnualInterestRate(){
        return annualInterestRate;
    }
     //声明设置属性AnnualInterestRate的值的方法
     public void setAnnualInterestRat(float newAnnualInterestRate){
        annualInterestRate=newAnnualInterestRate;
    }
     public double computeMonthlyPayment(){
         float  monthlyInterestRate;
         int numberOfPayments ;
         double monthlyPayment ;
         monthlyInterestRate = annualInterestRate / 100.0f / 12;
          numberOfPayments = loanPeriod * 12;
          monthlyPayment = (loanAmount * monthlyInterestRate) /
                  (1 - (Math.pow((1 + monthlyInterestRate), -numberOfPayments)));
         return monthlyPayment;
     }

     public double computeTotalPayment(){
         double totalPayment ;
         totalPayment = computeMonthlyPayment()*loanPeriod * 12;
         return totalPayment;
     }

}