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‎.gitignore

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.idea/
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target/

‎README.md

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# 视频课程配套代码
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http://www.andrew-programming.com
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# 如何使用该代码:
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这是 [Java 语言从入门到精通](https://www.udemy.com/bestjavatutorial/learn/v4/overview)的配套代码。
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为了更好的学习，请购买本视频课程。
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视频课程地址: [Java 语言从入门到精通](https://www.udemy.com/bestjavatutorial/learn/v4/overview)

‎andrew.txt

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Andrew programming is great!

‎input.txt

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2 3 4 5 6 7 8 9 12 23 32
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23 45 67 89 92 12 34 35 3 1 2 4 0

‎javaTututorial.iml

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<?xml version="1.0" encoding="UTF-8"?>
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<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
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<output url="file://$MODULE_DIR$/target/classes" />
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<output-test url="file://$MODULE_DIR$/target/test-classes" />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
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<excludeFolder url="file://$MODULE_DIR$/target" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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<orderEntry type="library" name="Maven: junit:junit:4.12" level="project" />
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<orderEntry type="library" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
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<orderEntry type="library" name="Maven: mysql:mysql-connector-java:8.0.18" level="project" />
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<orderEntry type="library" name="Maven: com.google.protobuf:protobuf-java:3.6.1" level="project" />
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</component>
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</module>

‎myFile.txt

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my file content!

‎pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.andrew-programming</groupId>
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<artifactId>javaTututorial</artifactId>
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<version>1.0-SNAPSHOT</version>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>8</source>
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<target>8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>8.0.18</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/org.openjfx/javafx -->
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<dependency>
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<groupId>org.openjfx</groupId>
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<artifactId>javafx</artifactId>
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<version>13</version>
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<type>pom</type>
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</dependency>
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</dependencies>
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</project>

‎scores.txt

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John T Smith 90
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Eric K Jones 85

‎src/main/java/ArrayListDemo/ArrayListDemo.java

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package ArrayListDemo;
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import java.util.*;
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public class ArrayListDemo {
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public static void main(String[] args) {
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// createArrayListThenAddElement();
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// createArrayListFromOtherArrayList();
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// arrayListRemoveDemo();
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// iteratingListRemoveDemo();
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// sortArrayListDemo();
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// usingArrayListSortMethod();
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usingComparableInterface();
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}
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public static void createArrayListThenAddElement() {
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ArrayList<String> carArrayList = new ArrayList();
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carArrayList.add("BMW");
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carArrayList.add("Benz");
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carArrayList.add("VV");
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System.out.println(carArrayList);
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System.out.println(carArrayList.size());
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System.out.println(carArrayList.isEmpty());
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System.out.println(carArrayList.get(0));
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}
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public static void createArrayListFromOtherArrayList() {
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ArrayList<String> benzCarArrayList = new ArrayList();
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benzCarArrayList.add("GLE");
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benzCarArrayList.add("smart");
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benzCarArrayList.add("GLC");
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ArrayList<ArrayList<String>> carArrayList = new ArrayList();
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carArrayList.add(benzCarArrayList);
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System.out.println(carArrayList);
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}
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public static void arrayListRemoveDemo() {
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ArrayList<String> carArrayList = new ArrayList();
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carArrayList.add("BMW");
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carArrayList.add("Benz");
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carArrayList.add("VV");
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carArrayList.remove(0);
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carArrayList.remove("Benz");
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carArrayList.removeAll(carArrayList);
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System.out.println(carArrayList);
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}
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public static void iteratingListRemoveDemo() {
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ArrayList<String> carArrayList = new ArrayList();
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carArrayList.add("BMW");
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carArrayList.add("Benz");
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carArrayList.add("VV");
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System.out.println("---------foreach-------------");
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for (String item : carArrayList) {
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System.out.println(item);
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}
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System.out.println("---------iterator-------------");
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Iterator<String> itr = carArrayList.iterator();
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while (itr.hasNext()) {
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System.out.println(itr.next());
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}
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System.out.println("----------simple for------------");
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for (int i = 0; i < carArrayList.size(); i++) {
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System.out.println(carArrayList.get(i));
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}
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}
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public static void sortArrayListDemo() {
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ArrayList<Integer> carArrayList = new ArrayList();
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carArrayList.add(43);
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carArrayList.add(-1);
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carArrayList.add(33);
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carArrayList.add(1);
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System.out.println(carArrayList);
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System.out.println("After sorted");
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Collections.sort(carArrayList);
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System.out.println(carArrayList);
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}
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public static void usingArrayListSortMethod() {
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List<String> names = new ArrayList<>();
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names.add("Lisa");
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names.add("Jennifer");
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names.add("Mark");
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names.add("David");
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System.out.println("Names : " + names);
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// Sort an ArrayList using its sort() method. You must pass a Comparator to the ArrayList.sort() method.
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names.sort(new Comparator<String>() {
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@Override
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public int compare(String name1, String name2) {
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return name1.compareTo(name2);
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}
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});
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// The above `sort()` method call can also be written simply using lambda expression
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names.sort((name1, name2) -> name1.compareTo(name2));
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// Following is an even more concise solution
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names.sort(Comparator.naturalOrder());
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System.out.println("Sorted Names : " + names);
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}
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public static void usingComparableInterface() {
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List<Person> people = new ArrayList<>();
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people.add(new Person("Sachin", 47));
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people.add(new Person("Chris", 34));
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people.add(new Person("Rajeev", 25));
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people.add(new Person("David", 31));
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System.out.println("Person List : " + people);
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// Sort People by their Age
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people.sort((person1, person2) -> {
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return person1.getAge() - person2.getAge();
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});
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// A more concise way of writing the above sorting function
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people.sort(Comparator.comparingInt(Person::getAge));
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System.out.println("Sorted Person List by Age : " + people);
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// You can also sort using Collections.sort() method by passing the custom Comparator
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Collections.sort(people, Comparator.comparing(Person::getName));
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System.out.println("Sorted Person List by Name : " + people);
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}
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}
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class Person {
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private String name;
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private Integer age;
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public Person(String name, Integer age) {
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this.name = name;
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this.age = age;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public Integer getAge() {
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return age;
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}
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public void setAge(Integer age) {
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this.age = age;
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}
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@Override
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public String toString() {
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return "{" +
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"name='" + name + '\'' +
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", age=" + age +
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'}';
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}
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}
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‎src/main/java/ArrayListDemo/ArrayListShow.java

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package ArrayListDemo;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.ListIterator;
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public class ArrayListShow {
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public static void main(String[] args) {
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ArrayList<String> arrayList = new ArrayList();
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arrayList.add("Andrew");
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System.out.println(arrayList);
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System.out.println(arrayList.size());
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arrayList.remove("Andrew");
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System.out.println(arrayList.size());
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arrayList.add("James");
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arrayList.add("Kobe");
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arrayList.add(1, "Jordan");
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arrayList.remove(1);
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System.out.println(arrayList);
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}
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}

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