十一、Assert

Assert.notNull(salary, "工资不能为空");
Assert.isTrue(salary >= 0, "工资不能为负数");

public static void notNull(@Nullable Object object, String message) {
    if (object == null) {
       throw new IllegalArgumentException(message);
    }
}
public static void isTrue(boolean expression, String message) {
		if (!expression) {
			throw new IllegalArgumentException(message);
		}
}

import org.springframework.util.Assert;