A sequence of non-space characters constitutes a word. Could the input string contain leading or trailing spaces? Yes. However, your reversed string should not contain leading or trailing spaces. How ...

Java gives you the ability to dynamically create strings. Even after you set the string value, you can add more characters to the string value throughout the code. This process lets you build a string ...

给一个String, 里面的Word被single space split开来, 目的是reverse里面所有的Word, 但preserve Word 和 space order. Note: In the string, each word is separated by single space and there will not be any extra space in the ...