Please code in Java. You will have a class called CalculatorGUI that will provid
ID: 3705129 • Letter: P
Question
Please code in Java.
You will have a class called CalculatorGUI that will provide the user interface for the calculator.
There should be an input text area to provide an input string that is either an infix expression or a postfix expression.
There should be two radio buttons that can be selected to determine if the given input string is a postfix or an infix expression.
There should be an output text area to display the value of the entered expression.
There should be 16 input buttons that when pressed enter a character into the input text field.
The buttons will be used to display the following characters:
The digits 0 through 9.
The operators +, -, *, /, ^ (for exponentiation).
The characters ( and ) for grouping in infix expressions.
The . for a decimal point.
An enter key to indicate when an expression is complete and calculation begins.
A space key to use as a separator.
Since there are more than 16 characters some keys will need to have a second function through the use of the shift key.
There should be a menu bar with the following menus:
A file menu with a single menu item to quit the application.
An options menu with three items:
An item to change the text color of the input text field.
An item to change the text color of the output text field.
An item to reset all colors to black.
When you right click on either the input text field or the output text field, there should be a popup menu that allows the user to make the current color darker or brighter.
Explanation / Answer
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Scanner;
import java.util.Stack;
import javax.script.ScriptEngineManager;
import javax.script.ScriptEngine;
import javax.script.ScriptException;
//import java.util.ActionEvent;
public class gui implements ActionListener {
public gui() {
}
public void actionPerformed (ActionEvent ae ){
// JOptionPane.showMessageDialog(ìHello is pressedî);
}
public static void main(String[] args) {
JFrame j = new JFrame("Buttons");
Container c = j.getContentPane();
//c.setLayout(new BorderLayout());
JPanel p1 = new JPanel();
p1.setLayout(new BorderLayout());
p1.setLayout(new GridLayout(4,4,4,4));
final JTextField t = new JTextField(100);
JRadioButton r2=new JRadioButton(" Infix");
Font myFontSize = t.getFont().deriveFont(Font.BOLD,50f);
t.setFont(myFontSize);
c.add(t,BorderLayout.NORTH);
final JButton n1 = new JButton("1");
n1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n1.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n2 = new JButton("2");
n2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n2.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n3 = new JButton("3");
n3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n3.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n4 = new JButton("4");
n4.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n4.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n5 = new JButton("5");
n5.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n5.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n6 = new JButton("6");
n6.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n6.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n7 = new JButton("7");
n7.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n7.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n8 = new JButton("8");
n8.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n8.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n9 = new JButton("9");
n9.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n9.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n10 = new JButton("0");
n10.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n10.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n11 = new JButton("+");
n11.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n11.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n12 = new JButton("-");
n12.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n12.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n13 = new JButton("*");
n13.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n13.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n14 = new JButton("/");
n14.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String num1 = n14.getText();
String global = t.getText();
global = global.concat(num1);
t.setText(global);
}
});
final JButton n15 = new JButton("=");
n15.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
//String num1 = n15.getText();
String global = t.getText();
//global = global.concat(num1);
ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine engine = mgr.getEngineByName("JavaScript");
try {
String s = engine.eval(global).toString();
t.setText(s);
} catch (ScriptException e1) {
e1.printStackTrace();
}
}
});
final JButton n16 = new JButton("C");
n16.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
//String num1 = n16.getText();
String global = t.getText();
global = null;
t.setText(global);
}
});
final JRadioButton r1=new JRadioButton(" Postfix");
r1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
final Stack operators = new Stack();
String infix;
infix = t.getText();
char symbol;
String postfix = "";
for(int i=0;i<infix.length();++i)
//while there is input to be read
{
symbol = infix.charAt(i);
//if it's an operand, add it to the string
if (Character.isLetter(symbol))
postfix = postfix + symbol;
else if (symbol=='(')
//push (
{
operators.push(symbol);
}
else if (symbol==')')
//push everything back to (
{
while (operators.peek() != "(")
{
postfix = postfix + operators.pop();
}
operators.pop(); //remove '('
}
else
//print operators occurring before it that have greater precedence
{
while (!operators.isEmpty() && !(operators.peek()=="(") )
postfix = postfix + operators.pop();
operators.push(symbol);
}
}
while (!operators.isEmpty())
postfix = postfix + operators.pop();
}
int prec(char x)
{
if (x == '+' || x == '-')
return 1;
if (x == '*' || x == '/' || x == '%')
return 2;
return 0;
}
});
p1.add(n1);
p1.add(n2);
p1.add(n3);
p1.add(n4);
p1.add(n5);
p1.add(n6);
p1.add(n7);
p1.add(n8);
p1.add(n9);
p1.add(n10);
p1.add(n11);
p1.add(n12);
p1.add(n13);
p1.add(n14);
p1.add(n15);
p1.add(n16);
p1.add(r1);
p1.add(r2);
c.add(p1,BorderLayout.CENTER);
j.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
j.setSize(400,400);
j.setVisible(true);
}
}