onicon f 3500| natural gas flow meter DN40

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1. Write a calculator in JAVA

import java. awt. BorderLayout; import java.awt.Color; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.SwingConstants; public class Jisuanqi extends JFrame implements ActionListener {/*** */private static final long serialVersionUID = 1L;Result result = new Result(); // Define the panel of text as Number_Key numb_key=new Number_Key(); //Define button panel//When clicking buttons+, -, *,/, com = trueboolean com = false; //When i=0, it means it is our first input and the string text will not accumulate. int i=0; //Store the content of text String text=""; //Click the buttons+, -, *, and/or the previous value double defbutton=0 for storing and storing ears; //The codes for+, -, *, and/are 1, 2, 3, and 4int symbol=0, respectively; //Constructor Jisuanqi() {super ("WangJiao");//Set the label cover question setDefaultCloseOperation (JFrame.EXIT_ON_COSE); //Set JPanel pane=new JPanel() to exit the program when closing the form; //Define the main panel pane. setLayout (new BorderLayout()); setBounds(380, 220, 30, 80); //The first two parameters are the coordinates displayed on the screen, and the last two are the size//replacement icon ImageIcon icon=new ImageIcon ("F: 1. GIF"); // Jisuanqi.class.getResource("APPLE.GIF")// ); setIconImage(icon.getImage()); pane.add(result, BorderLayout.NORTH); pane.add(number_key, BorderLayout.CENTER); pane.add(number_key.equal, BorderLayout.SOUTH); number_key.one.addActionListener(this); //Add listening event number \ key.two. addActionListen

er (this) to button 1; /Guess if you are a friend/Add listening event for button 2: number, key, prompt, addActionListener (this); //Add the listening event No.key.four.addActionListener (this) to button 3; //Add the listening event number \ key.five. addActionListener (this) to the 4 buttons; //Add the listening event No.key.six.addActionListener (this) to button 5; //Add the listening event No.key.seven.addActionListener (this) to button 6; //Add the listening event No.key.eight.addActionListener (this) to button 7; //Add the listening event No.key.nine.addActionListener (this) to button 8; //Add the listening event number \ key. zero. addActionListener (this) to button 9; //Add listening event number \ key.ce. addActionListener (this) to the 0 button; //Add the listening event number key. plus. addActionListener (this) to the opposite zero button; //Add listening event number \ key. equality. addActionListener (this) to the+button; //Add listening event number \ key. sub. addActionListener (this) to the=button; //Add listening event number \ key.mul. addActionListener (this) to the button; //Add listening event number \ key.div.addActionListener (this) to the * button; //Add listening event number \ key. point. addActionListener (this) to the/button; //Thats right Button to add listening event setContentPanel (pane); pack(); //Initialize the form size to fit all buttons perfectly.//The event triggered by each button is public void actionPerformed (ActionEvent e) {/* * If you clicked a numeric button, first check if you clicked+, -, *,/,=before that. If so, com=true. If there is no com=* false; Or whether to click the number key, if i=1, if there is no i=0; */if (e.getSource() == number_key.one) {if (com || i == 0) {re

onicon f 3500

1. Write a calculator in JAVA

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