How to realize the Calculator of addition, subtraction, multiplication and Division in java
Editor to share with you how to add, subtract, multiply and divide calculators, I believe that most people do not understand, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!
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Import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.awt.FlowLayout;import javax.swing.*;@SuppressWarnings ("unused") class Sumjp {JOptionPane jp = new JOptionPane (); Sumjp (String str) {JOptionPane.showMessageDialog (null, str); System.exit (0);} Sumjp (String [] str) {}} public class JiSuan extends JFrame implements ActionListener,ItemListener {/ * / private static final long serialVersionUID = 1L; double x1verse x2 Magazine sum = 0 String f; JTextField txt = new JTextField (30); JTextField txt1 = new JTextField (5); JTextField txt2 = new JTextField (5); JTextField txt3 = new JTextField (5); JLabel lb1 = new JLabel ("data 1:"); JLabel lb2 = new JLabel ("symbol:"); JLabel lb3 = new JLabel ("data 2:"); JButton jbtn = new JButton ("OK"); JiSuan () {setSize (350150); setVisible (true); setTitle ("Calculator:"); setDefaultCloseOperation (EXIT_ON_CLOSE) SetLayout (new FlowLayout ()); add (lb1); add (txt1); / / add (lb2); / / add (txt2); JComboBox jc = new JComboBox (); jc.addItem ("plus"); jc.addItem ("minus"); jc.addItem ("multiply"); jc.addItem ("divide"); add (jc); add (lb3); add (txt3); add (jbtn); add (txt); validate (); jc.addItemListener (this) Jbtn.addActionListener (this);} public void itemStateChanged (ItemEvent ie) {f = (String) ie.getItem (). ToString ();} public void actionPerformed (ActionEvent e) {x1 = Double.parseDouble (txt1.getText ()); / / f = txt2.getText (); x2 = Double.parseDouble (txt3.getText ()); if (f.equals ("plus")) {sum = x1 + x2;} if (f.equals (minus)) {sum = x1-x2 } if (f.equals ("multiplication")) {sum = x1x2;} if (f.equals (")) {sum = x1ax x2;} txt.setText (x1 + f + x2 +" = "+ sum); new Sumjp (x1 + f + x2 +" = "+ sum);} public static void main (String [] args) {/ / TODO auto-generated method stub new JiSuan ();}
The editor would like to share a piece of code for you. Thank the author for sharing: use java syntax to make a simple calculator of addition, subtraction, multiplication and division:
/ * implementation ideas: 1. Select all data to enter 2 from the keyboard. Use the switch statement to judge 3. Need to enter three times from the console * first number * operator * the second number is finally displayed on the console: welcome to the simple calculator system: please enter the first number: 10 Please enter the operator: + Please enter the second number: 20 calculation result: 10 "20" 30 s.nextInt () * / public class Calculator {public static void main (String [] args) {java.util.Scanner s = new java.util.Scanner (System.in); System.out.println ("Welcome to simple Calculator"); System.out.print ("Please enter the first number:"); int num1 = s.nextInt (); System.out.print ("Please enter operator:"); String operator = s.next () System.out.print ("Please enter the second number:"); int num2 = s.nextInt (); int result = 0; switch (operator) {case "+": result = num1 + num2; break; case "-": result = num1-num2; break; case "*": result = num1 * num2; break; case "/": result = num1 * num2; break; case "%": result = num1% num2 } System.out.println (num1+operator+num2+ "=" + result);}} above is all the content of the article "how to add, subtract, multiply and divide calculators in java". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!
