Class File Editor in Java

Download Java Class File Editor from https://sourceforge.net/projects/classeditor/files/

Extract the compressed file, and open the JAR file name ce.jar shown below.

If we are unable to open the file, we can open the command line/terminal and use the following command:

java - jar c : ce.jar

Once the editor is opened, we open a Java class file using the File > Open menu item and choose the explorer class file.

We will use the following code in the class file.

public class ExampleClass1 {
  private static final String METHOD_NAME1 = "exampleMethod1";
  private static final String METHOD_NAME2 = "exampleMethod2";

  public static void main(String[] args) {
    int abc = 200;
    System.out.println(abc);
    exampleMethod2();
  }

  static void exampleMethod2() {
    System.out.println("This is just a method");
  }
}

After the editor opens the file, we turn on the Modify Mode in the top-right corner; this mode is off by default, as shown in the image below. The button will turn blue if it is on and green if it is off.

After the modification is on, we can modify certain aspects of the class by going to different editor sections.

The General section of the editor shows the class name and its parent class. We can see and edit the interfaces if any are in the class. Class Access Modifiers are also there, which we can change if we want to.

The next section is the Constant Pool section, which displays all the editor’s constants in the class. Here we can change the type of the constant and its value. We can add new constants or delete an existing one.

The Fields section of the editor shows the fields with their access modifiers which we can modify.

The last section of the editor part is the Methods section, where all the class methods are listed with their name, access modifiers, and return types that are all editable, and we can change them.

After all the modifications, we save the class file using the File > Save menu item. We can also export all the items like the name of fields, constants, methods, and their values as an XML file using the File > Export to XML menu item.