What's Java extension

Question

Java

Answer 1

.java for source code.
.class for compiled code.
.jar for packed in archive

Answer 2

.java for source code.

Answer 3

.jar

Answer 4

When you write your program then your java file extension is .java

When you compile that file then one file generate which contains byte code, that file extension is .class.

When you make java archive file of that generated file which contains .class extension, that java archive file's extension called .jar