7.3

package loancalculator;


import javafx.scene.control.TextField;
import javafx.scene.control.*;
import javafx.application.Application;
import javafx.geometry.HPos;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;


public class LoanCalculator extends Application {
private TextField tfAnnualIntRate = new TextField();
private TextField tfNumYears = new TextField();
private TextField tfLoanAmount = new TextField();
private TextField tfMonthlyPayment = new TextField();
private TextField tfTotPayment = new TextField();
private Button btCalc = new Button("Calculate");
private Button btReset = new Button("Reset");
     @Override
    public void start(Stage stage1){
    GridPane gp = new GridPane();
    gp.setHgap(5);
    gp.setVgap(5);
    gp.add(new Label("Annual Interest Rate:"),0,0);
    gp.add(tfAnnualIntRate,1,0);
    gp.add(new Label("Number of Years:"),0,1);
    gp.add(tfNumYears,1,1);
    gp.add(new Label("Loan Amount:"),0,2);
     gp.add(tfLoanAmount,1,2);
    gp.add(new Label("Monthly Payment:"),0,3);
    gp.add(tfMonthlyPayment,1,3);
    gp.add(new Label("Total Payment:"),0,4);
    gp.add(tfTotPayment,1,4);
    gp.add(btCalc,1,5);
    gp.add(btReset,0,5);

    gp.setAlignment(Pos.CENTER);
    tfAnnualIntRate.setAlignment(Pos.BOTTOM_RIGHT);
    tfNumYears.setAlignment(Pos.BOTTOM_RIGHT);
    tfLoanAmount.setAlignment(Pos.BOTTOM_RIGHT);
    tfMonthlyPayment.setAlignment(Pos.BOTTOM_RIGHT);
    tfTotPayment.setAlignment(Pos.BOTTOM_RIGHT);
    tfMonthlyPayment.setEditable(false);
    tfTotPayment.setEditable(false);
    gp.setHalignment(btCalc,HPos.RIGHT);
    gp.setHalignment(btReset,HPos.RIGHT);

    btCalc.setOnAction(e -> calculateLoanPayment());
    btReset.setOnAction((ActionEvent) -> {
        tfAnnualIntRate.setText(" ");
        tfNumYears.setText(" ");
        tfLoanAmount.setText(" ");
        tfMonthlyPayment.setText(" ");
        tfTotPayment.setText(" ");
    });

    Scene scene = new Scene(gp, 400,250);
    stage1.setTitle("Loan Calculator");
     stage1.setScene(scene);
    stage1.show();

   }

    private void calculateLoanPayment(){
        double interest = Double.parseDouble(tfAnnualIntRate.getText());
        int year = Integer.parseInt(tfNumYears.getText());
        double loanAmount = Double.parseDouble(tfLoanAmount.getText());
         Loan loan = new Loan(interest, year, loanAmount);

           tfMonthlyPayment.setText(String.format("$%.2f",loan.getMonthlyPayment()));
      tfTotPayment.setText(String.format("$%.2f", loan.getTotalPayment()));
}
}