What are the methods to determine whether a string is empty in java

Method one:

   if(StringUtils.isNotBlank(str))//判断字符串不为空
   或if(StringUtils.isBlank(str))//判断字符串为空

Method two:

   if(s == null ||"".equals(s));

Method three: Compare string length

   if(s == null || s.length() <= 0);

Method Four:

   if(s == null || s.isEmpty());

Method five:

   if (s == null || s == "");

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