java explain the String str.trim().split();

Question

Can someone explain how this works? Which one works first and how can I use more than one method in one shot?

String[] temp = str.trim().split(" ");

Answer 1

Java always evaluating from left to right.

So, first you have a String ( str ). str.trim() returns a String that is trimmed. On that trimmed string that you now have, you can run another function, even when you didn't save it into a variable.

And then you run the split() method which returns an array of String s.

Answer 2

That depends on what do you have on your variable str.

Trim will remove all blanck spaces in the start and in the end of your string. Example: if you have a string like this " string " the result will be "string" .

Split will return an array of strings. example: if you have a string like this "this is my string" and you apply a split(" ") it will return to you something like this: ["this", "is", "my", "String"] .

Good coding

Answer 3

假设我们有这个字符串：“Hello world”，正如您所见，我们在 Hello 之前有 sapce，在 world 之后有空格，因此 trim 将消除这些空格，并且 split(' ') 将使表中的所有单词都被空格分隔，如下所示 ["Hello “，“世界”]