task 1|

.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" project-jdk-name="homebrew-23" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/lab2.iml" filepath="$PROJECT_DIR$/lab2.iml" />
+    </modules>
+  </component>
+</project>

lab2.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

src/Main.java

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+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Hello world!");
+    }
+}

src/MyDate.java

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+public class MyDate {
+    private int day, month, year;
+
+    public MyDate(int day, int month, int year) {
+        this.day = day;
+        this.month = month;
+        this.year = year;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        // Если ссылки равны объекты идентичны
+        if (this == o) return true;
+        // Если объект null или классы не совпадают возвращаем false
+        if (o == null || getClass() != o.getClass()) return false;
+        // Явное приведение типа и сравнение полей
+        MyDate myDate = (MyDate) o;
+        return day == myDate.day &&
+                month == myDate.month &&
+                year == myDate.year;
+    }
+
+    @Override
+    public int hashCode() {
+        // Формирование хэш-кода
+        int result = day;
+        result = 31 * result + month;
+        result = 31 * result + year;
+        return result;
+    }
+}

src/TestEquals.java

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+public class TestEquals {
+    public static void main(String[] args) {
+        MyDate date1 = new MyDate(7, 11, 2014);
+        MyDate date2 = new MyDate(7, 11, 2014);
+
+        if (date1 == date2)
+            System.out.println("date1 is identical to date2");
+        else
+            System.out.println("date1 is not identical to date2");
+
+        if (date1.equals(date2))
+            System.out.println("date1 equals date2");
+        else
+            System.out.println("date1 does not equal date2");
+
+        System.out.println("set date2 = date1");
+        date2 = date1;
+
+        if (date1 == date2)
+            System.out.println("date1 is identical to date2");
+        else
+            System.out.println("date1 is not identical to date2");
+    }
+}