Check whether a string is not null and not empty

Question

How can I check whether a string is not null and not empty?

public void doStuff(String str)
{
    if (str != null && str != \"**here I want to check          


        

Answer 1

In case you need to validate your method parameters you can use follow simple method

public class StringUtils {

    static boolean anyEmptyString(String ... strings) {
        return Stream.of(strings).anyMatch(s -> s == null || s.isEmpty());
    }

}

Example:

public String concatenate(String firstName, String lastName) {
    if(StringUtils.anyBlankString(firstName, lastName)) {
        throw new IllegalArgumentException("Empty field found");
    }
    return firstName + " " + lastName;
}