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Java Tutorial

Java is a programming language.

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

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示例 in Each Chapter

Our "Show Java" tool makes it easy to learn Java, it shows both the code and the result.

Example

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

Run example »

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.

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Java 测试

Test your Java skills with a quiz.

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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




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