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交作业

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两手都在抓

#1 Created at ... [Delete] [Delete and Lock User] 

var sb = new StringJoiner(", ","SELECT "," FROM "+table);

for(String fi:fields){
  sb.add(fi);
}

return sb.toString();

累一直狗

#2 Created at ... [Delete] [Delete and Lock User] 
想问个问题，关于StringJoiner（）这个类的构造方法，明明是
public StringJoiner(CharSequence delimiter,
                        CharSequence prefix,
                        CharSequence suffix) {

}

为什么这里可以+table 作为形参呢？

西科大公子

#3 Created at ... [Delete] [Delete and Lock User] 
" FROM "+table整体作为第三个参数
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