#Java 8, <s>245</s> <s>243</s> <s>241</s> <s>239</s> <s>238</s> 237 bytes (full program)

<!-- language-all: lang-java -->

    /**/interface M{static void main(String[]a){System.out.print("Hello, World!");}}//**/ iinntteerrffaaccee  MM{{ssttaattiicc  vvooiidd  mmaaiinn((SSttrriinngg[[]]aa)){{SSyysstteemm..oouutt..pprriinntt((""HHeelllloo,,  WWoorrlldd!!""));;}}}

[Try it online.](https://tio.run/##JY4xjoQwEAS/MjiyV3vmAfsBEiIHBIhgZBvkPexBZkBCFm/nQJe1Wl2t@uKOP7T49HW/11W/XnVI7POI1kNbVkYOFnYKDiKGJA3nkKZ@QFXMsbKPmjbWy12yFI2fZ3pDR3l2lVCf86yfQwghJWbvcx5HRGu9B2jbUtaVGZE5BGsB9p0oBOcAYkR8GCmNYc75ydPU98OAqFQpxhzHw3ofo9ZE28as9bL8L5mlFKJp/G1z@9D7DdB1RDnPs3NVJYRSn9vtvK4/)

After removing every other character:

    /*itraeMsai odmi(tig])Sse.u.rn(Hlo ol!)}/*/interface M{static void main(String[]a){System.out.print("Hello, World!");}}

[Try it online.](https://tio.run/##DcixDoMgEADQX0EnMC1@QH/AxYmhQ@Nwkas5i5yB06QxfDvtG98KJ9x5x7j6T619R5IAxwyk2G@khZbJuIz2sCnqIbDi0JjSdz1FwfSGGdV4ZQGhWZ1MXm1AUTtJFJfXBOZy3yy4WT7E7v8U3Q4YAt/Uk1PwTWsepdT6Aw)

-2 bytes (243 → 241) thanks to *@OlivierGrégoire*.  
-2 bytes (241 → 239) by creating a port of [*@SuperStormer*'s JavaScript answer](https://codegolf.stackexchange.com/a/128548/52210).

----------

#Java 8, 63 bytes (lambda function)

    /**/v->"Hello, World!"//**/vv-->>""HHeelllloo,,  WWoorrlldd!!""

[Try it online.](https://tio.run/##LY6xDoIwFEV3v@LRqRAKH0BkZpHFRAbjUNtqio@WlNLEGL4di7K85N6T3Hd6Hjjr5WsVyKcJTlybzwFAG6/cgwsF7RYBzt5p8wRBL1ZLCGkV2@UQz@S51wJaMHCEtcyyMrCaNArR5tBZhzIh5a8OjNU1IU2jIozY5jlA11nrHKKUSULIWm2T43zHOLkvh@3hEL3o3@F64@nu9J68Ggo7@2KMxFNTCGpmxHTXW9Yv)

After removing every other character:

    /*v>Hlo ol!/*/v->"Hello, World!"

[Try it online.](https://tio.run/##LY1BDoIwEEX3nGJgVYjAAYis2cjGRBfGRS3VFIeWtEMTYzh7LZHNJH9@3n8j97wch3cQyJ2DE1f6mwAoTdI@uZDQbxHgTFbpFwh2MWoAnzfxuybxOOKkBPSg4QihLnzboQGDaV3UvmyzTiKaA1yNxSHNQrMx8/LAyOyo3xanKGZ/ye3O8136cSSnyixUzbEhpivB9IKY7/41/AA)

**Explanation:**

Utilizes `//abc` single-line comments and `/*abc*/` multi-line comments.  
See the Java-highlighting of the two programs/functions to see how these type of comments are used.