from Wikipedia, Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. JDK or Java Development Kit is a set of tools needed for developing a Java Application, like compiler, interpreter and other tools. For writing a Java program you can use any text editor and save your files with .java extension.
At older times people used to type code in basic editors like notepad.
But now things has changed. To easily understand your code there are some softwares which can format your code, highlight syntax, compile and run your project in just one click, Find your errors at the same time writing the code and many more. A software like that is called an IDE or Integrated Development Environment. There are many IDEs available now and IntelliJ is one of them. Other than IntelliJ, there are many IDes like
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Java从Wikipedia中是一种高级，基于班级的，面向对象的编程语言，旨在具有尽可能少的实现依赖项。 jdk或Java Development套件是一组工具的工具。开发Java应用程序，例如编译器，解释器和其他工具。对于编写Java程序，您可以使用任何文本编辑器，并使用
.java扩展名保存文件。在较早的时候，人们过去曾在Notepad等基本编辑中键入代码。
但是现在情况已经改变了。为了轻松理解您的代码，有一些软件可以格式化您的代码，突出显示语法，单击一单击，同时浏览您的错误，同时撰写编写代码等等。这样的软件称为 ide 或 集成开发环境 。现在有许多IDE，Intellij就是其中之一。除了Intellij，还有许多IDE，例如
eclipse
netbeans
bluej
drjava
jdeveloper
疑问已经清除。
from Wikipedia, Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. JDK or Java Development Kit is a set of tools needed for developing a Java Application, like compiler, interpreter and other tools. For writing a Java program you can use any text editor and save your files with
.javaextension.At older times people used to type code in basic editors like notepad.
But now things has changed. To easily understand your code there are some softwares which can format your code, highlight syntax, compile and run your project in just one click, Find your errors at the same time writing the code and many more. A software like that is called an IDE or Integrated Development Environment. There are many IDEs available now and IntelliJ is one of them. Other than IntelliJ, there are many IDes like
Eclipse
NetBeans
BlueJ
DrJava
JDeveloper
and many more
I think now your doubt is cleared.