You can also use an IDE like Eclipse to run the java program but we will see this part in the. A Java class file (.class) is a file that contains Java byte code, compiled from a Java source files (.java extension) and can be executed on a Java Virtual Machine (VM). Copy the above program and paste it into the text editor.
Step 1: Open a text editor, like Notepad on Windows, and TextEdit on Mac.
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Prerequisite: You must install Java on your system.
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Similarly, set* methods are available for bytecode manipulation. How to compile and run the above program. assertEquals(objectClazz.getFileName(), "") ĪssertEquals(objectClazz.getMethods().length, 14) ĪssertTrue(objectClazz.toString().contains("public class ")) Type in the following Java statements: The import statement directs the compiler to resolve references to Person from the personpackage package. To run it, we need to run java with the name of the class as the argument (. Be sure to save this file in the compile-packages-in-java folder. This will create a file called MyFirstClass.class that holds the compiled java code. After hitting the enter key, you should see a new blank line in the CMD with nothing in it Now check within your personal Java folder. This file can be created with any text editor or IDE and contains your actual code. Throws Exceptions: įurther, the JavaClass class provides methods like getConstantPool, getFields, and getMethods to view the details of the disassembled class. In your text editor, create the Java program that will test the Person class. Type in javac JavaFileName.java where the JavaFileName.java is the name of the java file you want to compile. Private static native void registerNatives() Here, we've used the toString method on the objectClazz object to see bytecode in a concise format: JavaClass objectClazz = Repository.lookupClass("")