Receiving "illegal start of expression" and ';' expected

[Spirit_Guardian]

I am trying to compile my simple java code and receive two errors.

Any help will be appreciated.

1. Java1_Week2.java:19: illegal start of expression
public Java1_Week2() {

2. Java1_Week2.java:19: ';' expected
public Java1_Week2(){

Here is my code:

import java.text.DecimalFormat;

import javax.swing.*;


public class Java1_Week2 {


    public static void main(String[] args) {

        

JFrame mainWindow = new JFrame();

public Java1_Week2() {

// Declare method variables
        
double mortTerm = 30;
        
double mortRate = .0575;
        
double mortAmount = 200000;
        
double MT, MA, MR;

        
// Format the decimal place of the final number
        
DecimalFormat forma = new DecimalFormat("#,###0.00");

        
//Declare variables with amounts
        
MT = mortTerm*12;
        
MR = mortRate/12;
        
MA = mortAmount;

 

       
//Calculation of mortgate payment
        
double payment = (MA*(MR))/(1-(Math.pow(1/(1+(MR)),(MT))));

        
//Display amount of monthly payment
        
System.out.println("The monthly loan amount for a $200,000"
 + " loan at %5.75 interest rate is $" + forma.format(payment) + ".");


mainWindow.setTitle("Mortgage Calculator");
mainWindow.setSize(680,460);
mainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainWindow.setVisible(true);


}
    }

}

[masijade]

For one you are trying to declare something inside the main method. That doesn't work. For a second thing, what is it? if it is a class, add that keyword, and put it in another java file, of course, if it is a method, then declare the return type.

[jon.kiparsky]

Looks like it's meant to be a constructor, isn't it? Whatever it is, if you take out that line and one of your close curlies, you might have a legal program that does some calculation and then displays a JFrame with nothing in it.
At least, the rest of it looks like legal Java.

[Spirit_Guardian]

Thank you very much, that was the problem. I removed the offending line and it worked perfectly.

I was going through a video showing how to create a gui interface for a java application and wanted to try creating an empty form first. Thanks again for the help.