Update free-programming-books-th.md (#7598)
* Update free-programming-books-th.md additional Java exercise. * lint: leave 2 blank lines between listings and next heading Co-authored-by: Biswadeep Purkayastha <98874428+metabiswadeep@users.noreply.github.com> Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com> Co-authored-by: Biswadeep Purkayastha <98874428+metabiswadeep@users.noreply.github.com>pull/7446/head^2
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