learnit-codeit

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>com.lici.maven</groupId>
		<artifactId>maven-module</artifactId>
		<version>${project.version}</version>
	</parent>
	<artifactId>data-service</artifactId>

learnit-codeit

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>com.lici.maven</groupId>
		<artifactId>maven-module</artifactId>
		<version>${project.version}</version>
	</parent>
	<artifactId>email-service</artifactId>

learnit-codeit

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.lici.maven</groupId>
    <artifactId>maven-module</artifactId>
    <version>${project.version}</version>
  </parent>
  <artifactId>frontend</artifactId>
  <dependencies>
  	<dependency>

learnit-codeit

bin\java --module lici.modules.frontend/lici.modules.frontend.MyConsole

learnit-codeit

module lici.modules.db {
	exports lici.modules.db to lici.modules.services;
	provides lici.modules.db.MyDAO with lici.modules.db.MyDAOImpl;
}

learnit-codeit

String str1 = "Hello";
String str2 = "Hello";
StringBuffer buffer1 = new StringBuffer("hello");
StringBuffer buffer2 = new StringBuffer("hello");
System.out.println(str1.equals(str2));//this return true
System.out.println(buffer1.equals(buffer2));//this return false. Because StringBuffer not override the equals method

learnit-codeit

public static void main(String[] args) {
		String str1 = "Hello";
		String str2 = new String("Hello");
		String str3 = "World";
		String str4 = new String("Hello");
		String str5 = "Hello";
		if(str1 == str2) {
			System.out.println("str1 and str2 shares same memory location");
		}
		if (str2 == str4) {

learnit-codeit

public static void main(String[] args) {
		String first = new String("Hello")+new String("World");
		String second = new StringBuffer().append("Hello ").append("World").toString();
	}

learnit-codeit

public interface Operation {
	public int operate(int param1, int param2);

}

learnit-codeit

public class Calculate {
	public void doCalculation(Operation operation) {
		System.out.println(operation.operate(10, 20));
	}
	public static void main(String[] args) {
		//From here i want to call doCalculation function. How it possible?
	}

}