How to use Integer.valueOf and Integer.parseInt

This article mainly introduces "how to use Integer.valueOf and Integer.parseInt". In daily operation, I believe many people have doubts about how to use Integer.valueOf and Integer.parseInt. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to use Integer.valueOf and Integer.parseInt". Next, please follow the editor to study!

In our daily development work, we often need to convert a string value to an integer value. At this time, we can choose Integer.valueOf and Integer.parseInt.

Next, let's analyze the difference between the two methods.

The return value of Integer.valueOf is of type Integer

The return value of Integer.parseInt is of type int

Also, there is an internal cache class IntegerCache in the Integer class, which caches the Integer value of [- 128,127] by default.

Integer.parseInt is simple. It converts a string to a decimal int value.

The Integer.valueOf process is complicated. Let's take a look at a flow chart.

Step: 1. Use the Integer.parseInt method to convert the string type parameter of Integer.valueOf to int type 2. 2. Determine whether the parameter value is in the range of [- 128,127], and if it is in the range, take the value directly from the IntegerCache class. 3. If it is not within the scope, then directly create a new object here, the study on "how to use Integer.valueOf and Integer.parseInt" is over, I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!