First and main submission of assessment program with GUI.

pom.xml

+<?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>netbeanstest</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>15</maven.compiler.source>
+        <maven.compiler.target>15</maven.compiler.target>
+    </properties>
+</project>
\ No newline at end of file

receipt.txt

+20x  02 Book
+20x  07 Chocolate
+
+Cost before discount: 40
+Discount value: 50%
+Cost after discount: 20
+You paid: 20
+Change received: 0
\ No newline at end of file

src/main/java/JComboBox.java

+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author harry
+ */
+public class JComboBox {
+    
+}