Tutorials 参考 练习 Menu
Paid Courses

Java Tutorial

Java is a programming language.

Java is used to develop mobile apps, web apps, desktop apps, games and much more.

Start learning Java now »

示例 in Each Chapter

Our "来试试吧" editor makes it easy to learn Java. You can edit Java code and view the result in your browser.

Example

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

来试试吧 »

Click on the "Run example" button to see how it works.

We recommend reading this tutorial, in the sequence listed in the left menu.

Java is an object oriented language and some concepts may be new. Take breaks when needed, and go over the examples as many times as needed.


Java 练习

Test Yourself With 练习

Exercise:

Insert the missing part of the code below to output "Hello World".

public class MyClass {
  public static void main(String[] args) {
    ..("Hello World");
  }
}

Start the Exercise


Learn by 示例

Learn by examples! This tutorial supplements all explanations with clarifying examples.

See All Java 示例


Java 测试

Test your Java skills with a quiz.

Start Java 测试


Java参考

Java关键字

Java字符串方法

Java数学 Methods


Download Java

Download Java from the official Java web site: https://www.oracle.com


Kickstart your career

Get certified by completing the course

Get certified w3schools CERTIFIED . 2021




W3Schools is optimized for learning and training. 示例 might be simplified to improve reading and learning. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using W3Schools, you agree to have read and accepted our terms of use, cookie and privacy policy.

Copyright 1999-2021 by Refsnes Data. All Rights Reserved.
W3Schools is Powered by W3.CSS.