Validatable.java

import org.apache.commons.lang.StringUtils;

public class Validatable {

    private boolean isValid;

    public static <T> Validatable ifNull(T field) {
        if (field == null) {
            return new Validatable().invalid();
        } else {
            return new Validatable().valid();
        }
    }

    public static <T extends String> Validatable ifNullOrEmptyString(T field) {
        if (StringUtils.isEmpty(field)) {
            return new Validatable().invalid();
        } else {
            return new Validatable().valid();
        }
    }

    public static <T extends Object> Validatable areEqual(T o, T oo) {
        if (!o.equals(oo)) {
            return new Validatable().invalid();
        } else {
            return new Validatable().valid();
        }
    }

    private Validatable invalid() {
        isValid = false;
        return this;
    }

    private Validatable valid() {
        isValid = true;
        return this;
    }

    public ExceptionThrower thenThrow(Class<? extends RuntimeException> exceptionClass) {
        try {
            return new ExceptionThrower(exceptionClass, isValid);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

Simple use case would be:

Validatable. ifNullOrEmptyString(someString).thenThrow(IllegalArgumentException.class).withMessage("You got to be kidding me! try again with valid data");