It is quite simple. String in Java is a array of the chars internally. Using charAt(int index) you have direct access to this. ... <看更多>

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This rule replaces calls to indexOf() on instances of String s or Collection s with calls to the contains() method. contains() was introduced in Java 1.4 ... ... <看更多>

In this tutorial, you'll learn how to use the JavaScript String indexOf() method to find the index of a substring within a string. ... <看更多>