Generate 100 Java Tuple classes

vim 56 54 keystrokes

iclass Tuple1 {public Object _0;}<esc>qyYp<C-a>$y2bPr,<C-a>q98@y

Since V is backwards compatible, you can Try it online!

This is the perfect task for vim! I might golf it a little bit more later. Also note that <c-a> means Control-A, and it counts as one keystroke.

Explanation:

iclass Tuple1 {public Object _0;}<esc>         'Enter the starting text


qy                          'Start recording in register y
  Yp                        'Yank the current line, the print on the line below
     <C-a>                  'Increment the next digit to occur by one
          $                 'Move to the end of this line
           y2b              '(yank) 2 words (b)ack. This will grab '_0;'
              P             'Print the previously yanked word before the cursor.
               r,           '(r)eplace the char under the cursor with a comma.
                 <c-a>q     'Increment the current digit, then stop recording
                       99@y 'Playback macro 'y' 99 times.

Jelly, 44 bytes

R’j“,_”
“¤>%,oỊȤʠ“ØụĊ5D³ṃṠɼQ»j;Ç;“;}¶”
ȷ2RÇ€

My first Jelly answer. Try it online!

Pyth, 53 50 48 bytes

VS100%." }SüÆðQ´Ó3Ô«%&a´4UçõÛ"[Nj",_"UN

Try it online!

Straightforward iteration over range(1,100) and building the corrosponding string from a packed string through formatting it.

Explanation

VS100%." }SüÆðQ´Ó3Ô«%&a´4UçõÛ"[Nj",_"UN

VS100                                     # Iterate over range(1,100)
     %." }SüÆðQ´Ó3Ô«%&a´4UçõÛ"            # Unpack the string and format it
                              [           # List for formatting arguments
                               N          # Number of the Tuple
                                j    UN   # Join Object numbers...
                                 ",_"     # ...on the seperator ",_"

The unpacked string is class Tuple%i {public Object _%s;}