Heres an update. This allows for tabbing and private methods. I am not sure how many method types there are in java but this is the direction to go.

use strict;
use warnings;
while (<DATA>){
    print /^\s*(public)|^\s*(private)/?$_ = "/*".$_."*/\n":"$_\n";
}


__DATA__
/**
* public void method1();
* is deprecated
*/
public void method1();
    rgrprivate void method2();
    private void method3();
[download]

Output:
/**
* public void method1();
* is deprecated
*/
/*public void method1();*/
     rgrprivate void method2();
/*    private void method3();*/