如何使用ArrayList访问元素的特定索引？

Question

Say for example, I want to get the index of "w" in "howdy", or the "g", in "wasgood", how would i do that? The Arraylist .indexOf method only seems to return the entire element stored in the Arraylist

ArrayList <String> list = new ArrayList<String>();

list.add("hi");
list.add("howdy");
list.add("greetings");
list.add("wasgood");
list.add("squareup");
list.add("plurals");

Answer 1

This gets you position in arraylist of greetings.

list.indexOf("greetings");

This get you position of letter in word.

"greetings".indexOf("t");

Answer 2

"howdy".getIndexOf("w"); will return the index of 'w' in "howdy".

Answer 3

It looks like you want to know the char index in a string. What you should use is like "howdy".indexOf('w'). It has no relation to ArrayList. It is a method of String.