I want to search if this string contains "world". I used following functions but they have some problems. I used String.indexof() but if I ... ... <看更多>

java string find substringjava string indexfind all occurrences of a substring in a string javafind character in string javajava program to ... ... <看更多>

Efficiency. If you want to badly enough, I'm pretty sure you can improve the efficiency of your current code, at least for typical ... ... <看更多>