Java is the king of programming languages, and will still dominate in the future. IT is the development trend of the IT industry. Learning Java has become an irresistible trend.
Most people choose Java simply because they hear about its promise, its easier to find a job, its consistently in the top three on TIOBE, and so on.
The average monthly salary of A Java software engineer is around 10,000 yuan, far more than the average monthly salary of fresh graduates. Generally speaking, the salary of a senior Java software engineer with one year of work experience is about 130,000 ~ 150,000 yuan per year.
Java career direction: Can be engaged in JSP web development, Java programming, Java game development, Java desktop programming, and other Java language programming related work. Can be engaged in software design and development in telecom, banking, insurance professional software development companies.
Because of this, many people want to change careers to Become Java development engineers, and to become Java development engineers, interviews are a must.
Java
Java is an almost pure object-oriented programming language, but it introduced basic data types for programming convenience, but in order to be able to operate on these basic data types as objects, Java has a wrapperclass for each basic data type (wrapperclass). The wrapperclass for int is Integer. Since Java5, automatic boxing/unboxing has been introduced to make them interchangeable.
Java provides a wrapper type for each primitive type:
Primitive types: Boolean, char, byte, short, int, long, float, double
Wrapper types: Boolean, Character, Byte, Short, Integer, Long, Float, Double
Free Java interview questions
