Shulou(Shulou.com)06/01 Report--

This article introduces the relevant knowledge of "case Analysis of byte Storage problems in String". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Coding of value

Let's still use the example in String:

String s = new String ("java technology base")

In jdk1.8 and before, values in String were stored in char value []. In jdk11, the storage is replaced by byte [], as shown in the following figure:

In the debug breakpoint, we can see that the "java technology stronghold" is stored as:

Some friends already have doubts about why they have become these numbers. In fact, these are still char, just a change of form.

As shown in the following figure, we separately simulated the storage of the word "camp".

As you can see from the picture above, the char is actually split into two parts. We know that a single char is stored as a 2-byte, 16-bit unicode. For the battalion char, the decimal unicode is: '33829'. The conversion to binary is: 1000010000100101

We split the binary string into two parts, the first part is the low 8-bit '00100101', the other is the high 8-bit '10000100', and then convert the binary to decimal, which is 37 and-124 we see.

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