question: public java . lang . StringBuffer insert ( int offset , boolean b ) { internal . insert ( offset , b ) ; return this ; }
target:  Inserts the string representation of the boolean argument into this string buffer. The second argument is converted to a string as if by the method String.valueOf, and the characters of that string are then inserted into this string buffer at the indicated offset. The offset argument must be greater than or equal to 0, and less than or equal to the length of this string buffer.