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1. Write an application with three labeled text fields, one each for the initial amount of a savings account, the annual interest rate, and the number of years. Add a button “Calculate” and a read-only text area to display the balance of the savings account after the end of each year.

You can create a text area with:

private JTextArea balanceArea;

and initialize it with:

balanceArea = new JTextArea(20, 20);    <-- 20, 20 is the height, width

You can make it read-only with:

balanceArea.setEditable(false);

When the Calculate button is clicked, use a loop to calculate the updated balance for each year, and use the .append() method of the JTextArea to print the balance for each year; e.g.,

balanceArea.append(balance + "\n");

Answer 1

Create a file named gui.java and paste the below code in it

CODE:

import javax.swing.*;
import java.awt.event.*;
public class gui extends JFrame {
  
   public static void main(String[] args)
   {
       JFrame f= new JFrame("Interest calculator"); //JFrame object
   final JTextField t1,t2,t3; //Textfields
   t1=new JTextField();
   JLabel lab1 = new JLabel("Initial savings amount:"); //label for textfield1
   lab1.setBounds(20, 100, 200, 30);
   t1.setBounds(200,100, 200,30);
   t2=new JTextField();
   JLabel lab2 = new JLabel("Annual Interest Rate:"); //label for textfield2
   t2.setBounds(200,150, 200,30);
   lab2.setBounds(20, 150, 200, 30);
   t3=new JTextField();
   JLabel lab3 = new JLabel("Number of years:"); //label for textfield3
   t3.setBounds(200,200,200,30);
   lab3.setBounds(20, 200, 200, 30);
   JButton jb=new JButton("Calculate Interest"); //JButton b=object
   jb.setBounds(150,250,200,30);
  
   final JTextArea jt=new JTextArea(10,10); //JTextarea object
   jt.setBounds(150,300,300,200);
   jt.setEditable(false);
  
   //adding all the components to JFrame object
   f.add(t1); f.add(t2); f.add(t3);f.add(jb);f.add(lab1);;f.add(lab2);f.add(lab3);f.add(jt);
   f.setSize(600,600); //setting layout size
   f.setLayout(null);
   f.setVisible(true);
  
   //onclick listener for JButton
   jb.addActionListener(new ActionListener(){
       public void actionPerformed(ActionEvent e){
                   try{
                       jt.setText("");
                       //getting values from text fields
                       double savingsAmount=Double.parseDouble(t1.getText().trim());
                       double interestRate=Double.parseDouble(t2.getText().trim());
                       int noy=Integer.parseInt(t3.getText().trim());
                       double balance=savingsAmount;
                       //calculating saving amount for each year
                       for(int i=1;i<=noy;i++)
                       {
                           balance=balance+((interestRate*balance)/100);
                           jt.append("Balance in year"+i+"-"+balance+"\n");
                       }
                   }
                   catch(Exception excep)
                   {
                       jt.setText("Enter Valid Values!");
                       t1.setText("");
                       t2.setText("");
                       t3.setText("");
                   }
       }
       });
  
     
     
   }

}

OUTPUT:

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