words = words==null?"":words; java语言,
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words = words==null?"":words; java语言,
words = words==null?"":words; java语言,
words = words==null?"":words; java语言,
这是三元表达式,类似于 if else . ? 表示真,: 表示假
等同于下面:
if (words == null) {
words = "";
}else{
words = words;
}