Question 1
Assume StringBuilder strBuf is "ABCCEFC", after invoking ________, strBuf contains "ABTTEFT".
◦ strBuf.replace(2, 7, "TTEFT")
◦ strBuf.replace("CC", "TT")
◦ strBuf.replace("C", "T")
◦ strBuf.replace('C', "TT")
◦ strBuf.replace('C', 'T')
Question 2
The StringBuilder methods ________ not only change the contents of a string buffer, but also returns a reference to the string buffer.
◦ insert
◦ replace
◦ delete
◦ reverse
◦ append