用该行末尾的单词替换文本文档中的整行

Question

I am trying to replace the line with the word at the end of the line. Standing with the current I am getting the same line.

Simple:

apple - water- wall - street- light- book

REsult should be

book

Code:

while (scanner.hasNextLine()) {
    String line = scanner.nextLine();
    if (line.contains("-") ) {                   
        String[] lineSplitted = line.split("-");
        int index = lineSplitted.length - 1;
        String direction = lineSplitted[index];
        line.replace(line, direction);
    }   
}

Answer 1

如果您要完成的工作是将输入行替换为该行的最后一个单词，则只需将代码更改为以下内容：

Scanner scanner = new Scanner(System.in); String line = scanner.nextLine(); String[] parts = line.split("\\\\s"); line = parts[parts.length-1];

Answer 2

The type String is immutable, meaning that once constructed, the object itself cannot be changed. Instead of trying to update the string itself, update the reference ( line=direction; ).