more help with java problem

[Troy Johnson]

Hello again. I still cant seem to quite get this modification figured out and was looking for some more help. I am attempting to add two additional constructors, one that takes the "annual interest rate" and "loan amount" and another that just takes the "loan amount" only. However, I seem to be stuck along the way trying to add these two constructors. Please let me know if you have or more suggestions. Thanks again for the help.
Here is my original code:

// Mortgage.java: Encapsulate mortgage information
public class Mortgage {
  private double annualInterestRate;
  private int numOfYears;
  private double loanAmount;
  /** Default constructor */
  public Mortgage() {
    this(7.5, 30, 100000);
  }
  /** Construct a mortgage with specified annual interest rate,
      number of years and loan amount
    */
  public Mortgage(double annualInterestRate, int numOfYears,
    double loanAmount) {
    this.annualInterestRate = annualInterestRate;
    this.numOfYears = numOfYears;
    this.loanAmount = loanAmount;
  }
  /** Return annualInterestRate */
  public double getAnnualInterestRate() {
    return annualInterestRate;
  }
  /** Set a new annualInterestRate */
  public void setAnnualInterestRate(double annualInterestRate) {
    this.annualInterestRate = annualInterestRate;
  }
  /** Return numOfYears */
  public int getNumOfYears() {
    return numOfYears;
  }
  /** Set a new numOfYears */
  public void setNumOfYears(int numOfYears) {
    this.numOfYears = numOfYears;
  }
  /** Return loanAmount */
  public double getLoanAmount() {
    return loanAmount;
  }
  /** Set a newloanAmount */
  public void setLoanAmount(double loanAmount) {
    this.loanAmount = loanAmount;
  }
  /** Find monthly payment */
  public double monthlyPayment() {
    double monthlyInterestRate = annualInterestRate / 1200;
    return loanAmount * monthlyInterestRate / (1 - 
      (Math.pow(1 / (1 + monthlyInterestRate), numOfYears * 12)));
  }
  /** Find total payment */
  public double totalPayment() {
    return monthlyPayment() * numOfYears * 12;
  }
}

Here is my code with the modifications I have so far trying to add the two new constructors.

// Mortgage.java: Encapsulate mortgage information
public class Mortgage {
  private double annualInterestRate;
  private int numOfYears;
  private double loanAmount;
  /** Default constructor */
  public Mortgage() {
    this(7.5, 30, 100000);
}
/*Modify with new constructors*/
   class Mortgage (){
   this(30,annualInterestRate,loanAmount);
   this(7.5,30,loanAmount);
  }
//** Construct annual interest rate and loan amount*/

     public Mortgage(double annualInterestRate, double loanAmount) {
 this.annualInterestRate = annualInterestRate;
     this.loanAmount = loanAmount;
 }
 /** Return annualInterestRate and loan Amount
     */
     public double getAnualInterestRate {
 public double getloanAmount {
 return annualInterestRate * loanAmount;
}
/** Construct loan amount only*/
    public Mortgage(double loanAmount){
this.loanAmount = loanAmount;
}
/** Return loan amount only*/
    public double getloanAmount(){
return loanAmount;

 }
  /** Construct a mortgage with specified annual interest rate,
      number of years and loan amount
    */
  public Mortgage(double annualInterestRate, int numOfYears,
    double loanAmount) {
    this.annualInterestRate = annualInterestRate;
    this.numOfYears = numOfYears;
    this.loanAmount = loanAmount;
  }
  /** Return annualInterestRate */
  public double getAnnualInterestRate() {
    return annualInterestRate;
  }
  /** Set a new annualInterestRate */
  public void setAnnualInterestRate(double annualInterestRate) {
    this.annualInterestRate = annualInterestRate;
  }
  /** Return numOfYears */
  public int getNumOfYears() {
    return numOfYears;
  }
  /** Set a new numOfYears */
  public void setNumOfYears(int numOfYears) {
    this.numOfYears = numOfYears;
  }
  /** Return loanAmount */
  public double getLoanAmount() {
    return loanAmount;
  }
  /** Set a newloanAmount */
  public void setLoanAmount(double loanAmount) {
    this.loanAmount = loanAmount;
  }
  /** Find monthly payment */
  public double monthlyPayment() {
    double monthlyInterestRate = annualInterestRate / 1200;
    return loanAmount * monthlyInterestRate / (1 -
      (Math.pow(1 / (1 + monthlyInterestRate), numOfYears * 12)));
  }
  /** Find total payment */
  public double totalPayment() {
    return monthlyPayment() * numOfYears * 12;
  }
}

[Michael Dunn]

This seems to work OK

class MortgageCalculator
{
  public MortgageCalculator()
  {
    Mortgage a = new Mortgage();   
    Mortgage b = new Mortgage(6.5,30,100000);
    Mortgage c = new Mortgage(100000);
    Mortgage d = new Mortgage(6,50000);
    System.out.println(a.totalPayment()+"\n"+b.totalPayment());
    System.out.println(c.totalPayment()+"\n"+d.totalPayment());
    d.setAnnualInterestRate(3);
    System.out.println(d.totalPayment());   
    System.exit(0);
  }
  public static void main(String args[]){new MortgageCalculator();}
}
class Mortgage
{
  private double annualInterestRate = 7.5;
  private int numOfYears = 30;
  private double loanAmount = 100000;
  
  public Mortgage(){}                                     
  public Mortgage(double amount)
  {
    loanAmount = amount;
  }                 
  public Mortgage(double rate, double amount)
  {
    annualInterestRate = rate;
    loanAmount = amount;
  }                                            
  public Mortgage(double rate, int years, double amount)
  {
    annualInterestRate = rate;
    numOfYears = years;
    loanAmount = amount;
  }                                                                
  public double getAnnualInterestRate() {return annualInterestRate;}                                       
  public void setAnnualInterestRate(double rate) {annualInterestRate = rate;}                                  
  public int getNumOfYears() {return numOfYears;}                                       
  public void setNumOfYears(int years) {numOfYears = years;} 
  public double getLoanAmount() {return loanAmount;} 
  public void setLoanAmount(double amount) {loanAmount = amount;} 
  public double monthlyPayment() 
  {
    double monthlyInterestRate = annualInterestRate / 1200;
    return loanAmount * monthlyInterestRate / (1 - 
      (Math.pow(1 / (1 + monthlyInterestRate), numOfYears * 12)));
  } 
  public double totalPayment() {return monthlyPayment() * numOfYears * 12;}
}

[Troy Johnson]

Thanks alot for your help Michael. The only other thing is that I need to invoke another constructor using the keyword "this". Sorry, I should have stated that at the beginning of my posting. I appreciate your helping me. Thanks.