any one can help me? About MDAS and PEMDAS rules and Infix-Prefix, Infix-Postfix rules

I'm a new in Java language , somebody  can help me. this code is for GUI only, no formula. please help me.

import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Calculator extends JFrame {
	
	private JLabel statusLabel;
	private JTextField inputField;
	private JButton calculate, clear, cancel, infix, prefix, postfix;

public Calculator()
	
	{
		
		super("Calculator in Preliminary depends using a MDAS and PEMDAS rules and Infix-postfix,  Infix-prefix rules.");
		
		
		Container container= getContentPane();
		container.setLayout(new FlowLayout());
		
		
		statusLabel = new JLabel();
	
		
		container.add(new JLabel("Expression: "));
		inputField = new JTextField (20);
		container.add(inputField);
		
        container.add(new JLabel("Result: "));
		inputField = new JTextField (10);
		container.add(inputField);
				
		
		// button for  Expression

calculate = new JButton();	
		JButton calculate = new JButton("Calculate");
		container.add(calculate);
		
		
		
		
		
		clear = new JButton();
		JButton clear = new JButton("Clear");	
		container.add(clear);
		
		cancel = new JButton();
		JButton cancel = new JButton("Cancel");	
		container.add(cancel);	
			
		infix = new JButton();
		JButton infix = new JButton("Infix");	
		container.add(infix);	
			
		prefix = new JButton();
		JButton prefix = new JButton("Prefix");	
		container.add(prefix);	
			
		postfix = new JButton();
		JButton postfix = new JButton("Postfix");	
		container.add(postfix);

container.add( statusLabel );
			
			setSize( 500, 150 );
			setVisible( true );
			
			}
	
	public static void main (String args[])
	
	{
		
		Calculator application = new Calculator();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	
			
	
	}

I'll be glad to help but what is it you need help with? We have no idea what problem you're having.

the image that u can see in top is the GUI that i make it.

Expression: ((((4*3)+(6/2*2)+2)/(6*2-3*2)*2)*2)*(34/2) // if i enter this Expression is Calculate for MDAS or PEMDAS rule or Infix
Result: 226.644

Search the string until you find a left bracket with a right bracket appearing before another left bracket does.

I see you've posted this on other message boards. Try spending more time thinking through the problem then running around the web asking for help.