check if blank string java code example

Example 1: check if a string is empty java

if (myString == null || myString.equals(""))
			throw new IllegalArgumentException("empty string");

Example 2: java string util if empty default

String emptyString = new String();    
result = StringUtils.defaultIfEmpty(emptyString, "default");
System.out.println(result);

String nullString = null;
result = StringUtils.defaultIfEmpty(nullString, "default");
System.out.println(result);