Thread: GUI, textarea help, line by line string

how can I show multiple lines on gui textField, right now it will only show the latest "value". Please click on the link below to see the GUI output. Notice it's only showing the 2 $1.

https://drive.google.com/file/d/0B2-...it?usp=sharing

GUI Code

    private void paymentTextFieldActionPerformed(java.awt.event.ActionEvent evt) {                                                 
 
        double payment = Double.parseDouble(paymentTextField.getText());
        paymentTextField.setText(fmt.format(payment));
 
        finalChange = payment - allTotal;
        change.setText(String.valueOf(fmt.format(finalChange)));
 
        int dollar;
        double cent;
        dollar = (int)finalChange % 1000000;
        cent = finalChange - dollar;
 
        if((dollar / 100) >= 1)
        {
            changeTextArea.setText(dollar / 100 + " $100");
            dollar = dollar - 100 * (dollar / 100);
        }
 
        if((dollar / 50) >= 1)
        {
            changeTextArea.setText(dollar / 50 + " $50");
            dollar = dollar - 50 * (dollar / 50);
        }
 
        if((dollar / 20) >= 1)
        {
            changeTextArea.setText(dollar / 20 + " $20");
            dollar = dollar - 20 * (dollar / 20);
        }
 
        if((dollar / 10) >= 1)
        {
            changeTextArea.setText(dollar / 10 + " $10");
            dollar = dollar - 10 * (dollar / 10);
        }
 
        if((dollar / 5) >= 1)
        {
            changeTextArea.setText(dollar / 5 + " $5");
            dollar = dollar - 5 * (dollar / 5);
        }
 
        if((dollar / 1) >= 1)
        {
            changeTextArea.setText(dollar / 1 + " $1");
        }      
 
    }

test code output, what I want the GUI above to look like

1 $5
2 $1
3 $0.01

test code

package correctchange;
 
public class CorrectChange {
 
    public static void main(String[] args) {          
 
        double change = 7.03;
 
        int dollar;
        double cent;
        dollar = (int)change % 1000000;
        cent = change - dollar;
 
        // dollar calculation
 
        if((dollar / 100) >= 1)
        {
            System.out.println(dollar / 100 + " $100");
            dollar = dollar - 100 * (dollar / 100);
        }
 
        if((dollar / 50) >= 1)
        {
            System.out.println(dollar / 50 + " $50");
            dollar = dollar - 50 * (dollar / 50);
        }
 
        if((dollar / 20) >= 1)
        {
            System.out.println(dollar / 20 + " $20");
            dollar = dollar - 20 * (dollar / 20);
        }
 
        if((dollar / 10) >= 1)
        {
            System.out.println(dollar / 10 + " $10");
            dollar = dollar - 10 * (dollar / 10);
        }
 
        if((dollar / 5) >= 1)
        {
            System.out.println(dollar / 5 + " $5");
            dollar = dollar - 5 * (dollar / 5);
        }
 
        if((dollar / 1) >= 1)
        {
            System.out.println(dollar / 1 + " $1");
        }
 
        // cents calculation        
 
        if((cent / 0.25) >= 1.00)
        {
            System.out.println((int)(cent / 0.25) + " $0.25");
            cent = cent - 0.25 * (cent / 0.25);
        }
 
        if((cent / 0.10) >= 1.00)
        {
            System.out.println((int)(cent / 0.10) + " $0.10");
            cent = cent - 0.10 * (cent / 0.10);
        }
 
        if((cent / 0.05) >= 1.00)
        {
            System.out.println((int)(cent / 0.05) + " $0.05");
            cent = cent - 0.05 * (cent / 0.05);
        }
 
        if((cent / 0.01) >= 1.00)
        {
            System.out.println((int)(cent / 0.01) + " $0.01");
//            cent = cent - 0.01 * (cent / 0.01);
        }
 
    }
}

Originally Posted by Norm

Read the API doc for the JTextArea class. There are methods to set the text to a String and to append a String to what is there.

Thank you, I'll try that