init

.gitignore

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+# .gitignore format from https://github.com/github/gitignore/blob/main/Java.gitignore
+
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see 
+http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+replay_pid*

README.md

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+# Calculator
+
+A simple calculator implemented in Java, with a GUI written using Spring.

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.mycompany</groupId>
+    <artifactId>JavaCalculator</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>18</maven.compiler.source>
+        <maven.compiler.target>18</maven.compiler.target>
+        <exec.mainClass>com.mycompany.javacalculator.JavaCalculator</exec.mainClass>
+    </properties>
+</project>

src/main/java/com/mycompany/javacalculator/JavaCalculator.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ */
+
+package com.mycompany.javacalculator;
+
+import java.awt.GridLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.swing.BorderFactory;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+
+/**
+ *
+ * @author mikayladobson
+ */
+public class JavaCalculator implements ActionListener {
+    private final JFrame frame;
+    private final JLabel label;
+    private final JPanel mainPanel;
+    
+    private final NumButton btn1;
+    private final NumButton btn2;
+    private final NumButton btn3;
+    
+    public JavaCalculator() {
+        frame = new JFrame();
+        label = new JLabel("Initial value");
+        
+        mainPanel = new JPanel();
+        mainPanel.setBorder(BorderFactory.createEmptyBorder(100,100,100,100));
+        mainPanel.setLayout(new GridLayout(4, 4));        
+        mainPanel.add(label);
+        
+        btn1 = new NumButton(1, this);
+        btn2 = new NumButton(2, this);
+        btn3 = new NumButton(3, this);
+        
+        mainPanel.add(btn1);
+        mainPanel.add(btn2);
+        mainPanel.add(btn3);
+        
+        frame.add(mainPanel);
+        frame.setTitle("Calculator");
+        
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.pack();
+        frame.setVisible(true);
+    }
+
+    public static void main(String[] args) {
+        new JavaCalculator();
+    }
+    
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        NumButton source = (NumButton)e.getSource();
+        label.setText(source.getText());
+    }
+}

src/main/java/com/mycompany/javacalculator/NumButton.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package com.mycompany.javacalculator;
+import javax.swing.JButton;
+
+/**
+ *
+ * @author mikayladobson
+ */
+public class NumButton extends JButton {
+    private static int btnValue;
+    
+    public NumButton(int btnValue, JavaCalculator calculator) {
+        this.btnValue = btnValue;
+        this.addActionListener(calculator);
+        this.setText(String.valueOf(btnValue));
+    }
+    
+    public int getValue() {
+        return this.btnValue;
+    }
+}

target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst

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+com/mycompany/javacalculator/JavaCalculator.class
+com/mycompany/javacalculator/ButtonRow.class
+com/mycompany/javacalculator/NumButton.class

target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst

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+/Users/mikayladobson/Developer/Java/JavaCalculator/src/main/java/com/mycompany/javacalculator/JavaCalculator.java
+/Users/mikayladobson/Developer/Java/JavaCalculator/src/main/java/com/mycompany/javacalculator/ButtonRow.java
+/Users/mikayladobson/Developer/Java/JavaCalculator/src/main/java/com/mycompany/javacalculator/NumButton.java