how to check if string is empty in if condition in java code example

Example 1: check if string is null or empty java

if(str != null && !str.isEmpty()) { /* do your stuffs here */ }

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);