String
判断字符串是否为空
1 public boolean isEmpty(String s){ 2 return s==null || s.length()==0; 3 }
数组转换为String
String[] str = {"a","b","cd"};
String str1 = Arrays.toString(str);
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Integer
原文：https://www.cnblogs.com/kongieg/p/10570160.html