/** Ensures the truth of an expression, with an error message. */
public static void checkArgument(boolean expression, String errorMessage) {
checkArgumentInternal(expression, true, errorMessage, EMPTY_ARGUMENTS);
}
/** Ensures the truth of an expression, with an error message that takes arguments. */
public static void checkArgument(
boolean expression, String errorMessageTemplate, Object... errorMessageArgs) {
checkArgumentInternal(expression, true, errorMessageTemplate, errorMessageArgs);
}
/** Ensures the truth of an expression. */
public static void checkArgument(boolean expression) {
checkArgumentInternal(expression, true, "Illegal argument.", EMPTY_ARGUMENTS);
}