Blue J
Provides an integrated educational Java development environment for Java beginners. It can also use the Java Development Kit (JDK) to develop small software. Installation methods of various versions and operating systems can be found here.
After installing BlueJ IDE on the laptop, start a new project, click New Project in the Project menu, and start writing Java code by creating a new class.
BlueJ not only provides an interactive graphical user interface (GUI) for the school's Java programming course teaching, but also allows developers to call functions (ie objects, methods, parameters) without compiling the source code.
Eclipse
Eclipse is one of the most famous Java IDEs on desktop computers. It supports multiple programming languages such as C/C++, JavaScript, and PHP. It also allows developers to add endless extensions from the Eclipse market for more development convenience.
IntelliJ IDEA
IntelliJ IDEA CE (Community Edition) is the open source version of IntelliJ IDEA, which provides IDEs for Java, Groovy, Kotlin, Rust, Scala and other programming languages. IntelliJ IDEA CE is also very popular among experienced developers. You can use it to refactor existing source code, check code, build test cases using JUnit or TestNG, and build code using Maven or Ant.