Western Governors University (WGU) ICSC2211 D684 Introduction to Computer Science Practice Test

The file extension most commonly associated with program source files is .java. This extension is used for Java source files, which contain the code written in the Java programming language. These files are typically created by programmers and need to be compiled by the Java compiler to run as executable programs.

While .py is indeed an extension for Python source files, and .txt represents plain text files, .java stands out in its specific association with the Java programming language, which is widely used in numerous applications and platforms. The .exe extension, on the other hand, is used for executable files that have already been compiled and do not constitute source code.

In summary, the .java extension distinctly represents the original source files of Java programs, differentiating it from the other file types which either indicate finished executable files or other forms of content.