An empty string in Java refers to a string of length 0, that is, a string object that does not contain any characters.

1. The empty string "" is a string of length 0.

2. The empty string is a Java object with its own string length (0) and content (empty). String variables can also store a special value called null , which means that there is currently no object associated with the variable.

Example

String str = “\r\n\t”;
System.out.println(str + “" + StringUtils.isBlank(str));
str.replace("\r", “”);
str.replace("\t", “”);
str.replace("\n", “”);
System.out.println(str + "” + StringUtils.isBlank(str));

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