Idea Code Analysis问题

Question

Idea Code Analysis为什么建议用Java String的contains(Charquens s) 代替indexOf(String s)？是效率高还是因为阅读方便

Answer 1

应该是便于阅读，String的contains方法源码就是使用的indexOf

    /**
     * Returns true if and only if this string contains the specified
     * sequence of char values.
     *
     * @param s the sequence to search for
     * @return true if this string contains {@code s}, false otherwise
     * @since 1.5
     */
    public boolean contains(CharSequence s) {
        return indexOf(s.toString()) > -1;
    }