Simple example of Java class: ComplexNumber with usage demo

seminars/.gitignore

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+/class01/target/

seminars/class01/nb-configuration.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project-shared-configuration>
+    <!--
+This file contains additional configuration written by modules in the NetBeans IDE.
+The configuration is intended to be shared among all the users of project and
+therefore it is assumed to be part of version control checkout.
+Without this configuration present, some functionality in the IDE may be limited or fail altogether.
+-->
+    <properties xmlns="http://www.netbeans.org/ns/maven-properties-data/1">
+        <!--
+Properties that influence various parts of the IDE, especially code formatting and the like. 
+You can copy and paste the single properties, into the pom.xml file and the IDE will pick them up.
+That way multiple projects can share the same settings (useful for formatting rules for example).
+Any value defined here will override the pom.xml file value but is only applicable to the current project.
+-->
+        <org-netbeans-modules-editor-indent.CodeStyle.usedProfile>project</org-netbeans-modules-editor-indent.CodeStyle.usedProfile>
+        <org-netbeans-modules-editor-indent.CodeStyle.project.spaces-per-tab>4</org-netbeans-modules-editor-indent.CodeStyle.project.spaces-per-tab>
+        <org-netbeans-modules-editor-indent.CodeStyle.project.tab-size>4</org-netbeans-modules-editor-indent.CodeStyle.project.tab-size>
+        <org-netbeans-modules-editor-indent.CodeStyle.project.indent-shift-width>4</org-netbeans-modules-editor-indent.CodeStyle.project.indent-shift-width>
+        <org-netbeans-modules-editor-indent.CodeStyle.project.expand-tabs>false</org-netbeans-modules-editor-indent.CodeStyle.project.expand-tabs>
+        <org-netbeans-modules-editor-indent.CodeStyle.project.text-limit-width>80</org-netbeans-modules-editor-indent.CodeStyle.project.text-limit-width>
+        <org-netbeans-modules-editor-indent.CodeStyle.project.text-line-wrap>none</org-netbeans-modules-editor-indent.CodeStyle.project.text-line-wrap>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaces-per-tab>4</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaces-per-tab>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceBeforeMethodDeclParen>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceBeforeMethodDeclParen>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceBeforeMethodCallParen>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceBeforeMethodCallParen>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.tab-size>4</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.tab-size>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.indent-shift-width>4</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.indent-shift-width>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.classDeclBracePlacement>NEW_LINE</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.classDeclBracePlacement>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.expand-tabs>false</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.expand-tabs>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.text-limit-width>80</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.text-limit-width>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.otherBracePlacement>NEW_LINE</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.otherBracePlacement>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.methodDeclBracePlacement>NEW_LINE</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.methodDeclBracePlacement>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.text-line-wrap>none</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.text-line-wrap>
+    </properties>
+</project-shared-configuration>

seminars/class01/pom.xml

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+<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>ru.mipt</groupId>
+  <artifactId>class01</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <packaging>jar</packaging>
+
+  <name>class01</name>
+  <url>http://maven.apache.org</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>

seminars/class01/src/main/java/ru/mipt/spring2014/class01/ComplexNumber.java

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+/**
+ * ComplexNumber.java
+ * Created On Feb 26, 2013
+ * @author Andrei
+ */
+package ru.mipt.spring2014.class01;
+
+public class ComplexNumber
+{
+	private final double a, b;
+
+	public ComplexNumber (double a, double b)
+	{
+		this.a = a;
+		this.b = b;
+	}
+
+	//TODO: создать конструктор без аргументов
+
+	public double getReal ()
+	{
+		return a;
+	}
+
+	public double getIm ()
+	{
+		return b;
+	}
+
+	public ComplexNumber add (ComplexNumber other)
+	{
+		return new ComplexNumber (a + other.a, b + other.b);
+	}
+
+	public ComplexNumber subtract (ComplexNumber other)
+	{
+		//TOOD: реализовать по аналогии с методом add
+		throw new UnsupportedOperationException ("Division isn't supported yet");
+	}
+
+	//TODO: аналогичным образом реализовать методы умножения (multiply) и деления (divide)
+
+	@Override
+	public String toString ()
+	{
+		return String.valueOf (a) + " + " + b + "*i";
+	}
+
+	@Override
+	public boolean equals (Object obj)
+	{
+		if (obj instanceof ComplexNumber)
+		{
+			final ComplexNumber other = (ComplexNumber) obj;
+			return a == other.a && b == other.b;
+		} else
+		{
+			return false;
+		}
+	}
+}

seminars/class01/src/main/java/ru/mipt/spring2014/class01/Demo.java

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+/**
+ * Demo.java
+ * Created on Feb 13, 2014
+ */
+package ru.mipt.spring2014.class01;
+
+public class Demo
+{
+	public static void main (String[] args)
+	{
+		System.out.println ("ComplextNumber class demo");
+
+		ComplexNumber c1 = new ComplexNumber (5, 3), c2 = new ComplexNumber (2, -1);
+
+		System.out.println ("(" + c1 + ") + (" + c2 + ") = " + c1.add (c2));
+	}
+}