import javax.swing.*;
public class TimeDeposit{
  public static void main(String[] args){
  String choice1, choice2,monthlySales,income;
  int value1, value2;
  // to display value of a variable
  DecimalFormat num=new DecimalFormat(",###.00");
  JOptionPane.showMessageDialog(null,"Monthly Sales In $","Bank", JOptionPane.INFORMATION_MESSAGE);
  JOptionPane.showMessageDialog(null,"the Interest is 0.025"num.format(monthlySales)+"income is"+num.format(income),"Bank", JOptionPane.INFORMATION_MESSAGE);
  choice1=JOptionPane.showInputDialog("The time less than: ");
  value1=Integer.parseInt(choice1);
  
  choice2=JOptionPane.showInputDialog("The deposit is greater than: ");
  value2=Integer.parseInt(choice2);
  
  switch(value1){
  case 1:
  JOptionPane.showMessageDialog(null,"the Interest is 0.025","Bank", JOptionPane.INFORMATION_MESSAGE);
  break;
  case 2:
  if(value2>=24){
  JOptionPane.showMessageDialog(null,"the Interest is 0.030","Bank", JOptionPane.INFORMATION_MESSAGE);
  }else{
    JOptionPane.showMessageDialog(null,"No Interest service for your input","Bank", JOptionPane.INFORMATION_MESSAGE);
	}
  break;
  case 3:
  if(value2>36){
  JOptionPane.showMessageDialog(null,"the Interest is 0.035","Bank", JOptionPane.INFORMATION_MESSAGE);
  }else{
    JOptionPane.showMessageDialog(null,"No Interest service for your input","Bank", JOptionPane.INFORMATION_MESSAGE);
	}
  break;
  case 4:
  if(value2>48){
  JOptionPane.showMessageDialog(null,"the Interest is 0.045","Bank", JOptionPane.INFORMATION_MESSAGE);
  }else{
    JOptionPane.showMessageDialog(null,"No Interest service for your input","Bank", JOptionPane.INFORMATION_MESSAGE);
  }
  break;
  case 5:
  if(value2>60){
  JOptionPane.showMessageDialog(null,"the Interest is 0.0475","Bank", JOptionPane.INFORMATION_MESSAGE);
  }else{
    JOptionPane.showMessageDialog(null,"No Interest service for your input","Bank", JOptionPane.INFORMATION_MESSAGE);
	}
  break;
  default:
  JOptionPane.showMessageDialog(null,"No Interest service for you","Bank", JOptionPane.INFORMATION_MESSAGE);
  break;
  }
 }
}

this my assignment

my mentor told me a condition of having 2 decimal places only and calculate it with the rate per certain year

can someone help me please

Please don't put titles like this!
Put something like: Error in..., Help in...
Thanks!

You need to add the following import to use "DecimalFormat":

import java.text.*;

Line #9: add "+" between 0.025 and num.format(monthlySales)
Line #9: num.format requires a number not a string

If monthlySales is declared as String, you need to covert to a number before passing it to format.

String monthlySales
num.format(Double.parseDouble(monthlySales))

Otherwise, if you declare monthlySales as a double you can leave it as is:

double monthlySales
num.format(monthlySales)

line #11 and 14: Are you sure you want these to be integers?
Maybe double:

double value1
value1 = Double.parseDouble(choice1)

Is this supposed to be a console program? If so, you might want to use "java.io.BufferedReader" or "java.util.Scanner" for input. And for output, use "System.out.print" or "System.out.println".