JAVA Classes

Creating a JAVA class

• Every Java code is defined in classes.
• Classes are defined in the source code file with extension .java.
• JAVAC command is used to compile your JAVA code, and it also creates a file with extensions .class, which is interpreted by JVM,
• then JAVA command is used to run the compiled byte code file.

Most of the beginners will have a dought that can we have Multiple main methods or can a java file have multiple classes with a “public” modifier ??

• One JAVA file can consist of Many class with one main Method, the Main method is nothing but it is the entry point of the Application
• but there must be at most one public class file if there is a public file that must be similar to the file name else if no public class exists file name can by be any...
• .class files are created for every class in JAVA.

Main1.java

After Compilation 3 .class files are generated …

when

• java Main1

• java Main2