readme.md

• The Java Language
  • Java Versions
    • Older Versions
      • Java 1.3
      • Java 1.4
      • Java 1.5
      • Java 1.6
    • Java 7
    • Java 8
    • Java 9
    • Java 11
    • Java 12
    • Java 13
    • Java 14
    • Java 15
    • Java 16
    • Java 17
    • Java 18
    • Java 19
    • Java 20
  • Java installation Management SDK
    • SDKMan
      • Find java distro version number
      • install JDK version
    • Install default JDK and JRE Ubuntu
      • Install popular OpenJDK
      • Use update-alternative to set version for Java runtime
      • Use update-alternative to set version for Java compiler
      • Git Repo reporting Demo for one Java WebApp
    • OpenJDK
    • Oracle Java

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The Java Language

high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible

Java Versions

Older Versions

Java 1.3

Java 1.4

Java 1.5

Java 1.6

Java 7

Java 8

Java 9

Java 11

Java 12

Java 13

Java 14

Java 15

Java 16

Java 17

Java 18

Java 19

Java 20

Java 21

LTS. Recently using Amazon JDK

Java installation Management SDK

Manage multiple version with sdkman

SDKMan

Installation

• install SDK Man

curl -s "https://get.sdkman.io" | bash

Find java distro version number

sdk list java | grep "21.0"

Install target JDK version

SDK_MAN_JAVA_VERSION="21.0.2-amzn"

sdk install java $SDK_MAN_JAVA_VERSION

Using Ubuntu apt

leverage OS package manager

Install default JDK and JRE Ubuntu

sudo apt install default-jdk default-jre

Install popular OpenJDK

sudo apt install openjdk-8-jdk

Use update-alternative to set version for Java runtime

update-alternatives --config java

Use update-alternative to set version for Java compiler

update-alternatives --config javac

JDKs

OpenJDK

Oracle Java

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