Java字符串拼接写法

常用的三种字符串拼接写法：

1. joiner.on

	String result = Joiner.on(",").join(list);

2. StringBuilder

	StringBuilder strBur = new StringBuilder();
		list.forEach(val -> {
		    strBur.append(val).append("#");
		});
		strBur.toString();

3. Java8Stream的写法

	String result = list.stream().collect(Collectors.joining("_"));