how to check if something is an empty string code example

Example 1: check if string is null or empty java

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

Example 2: javascript if string empty

// Test whether strValue is empty or is None
if (strValue) {
    //do something
}
// Test wheter strValue is empty, but not None 
if (strValue === "") {
    //do something
}

Example 3: check if a string is empty java

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