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Most people do not understand the knowledge points of this "Java automatic packing and unpacking source code analysis" article, so the editor summarizes the following contents, detailed contents, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "Java automatic packing and unpacking source code analysis" article.

What do you mean by packing & unpacking?

The process of converting an int primitive type to an Integer wrapper type is called boxing and vice versa.

First, look at the code public static void main (String [] args) {Integer a = 127,b = 127; Integer c = 128d = 128; System.out.println (a = = b); / / true System.out.println (c = = d); / / false}

I wonder if there is anyone who doesn't know why true and false appear in this code. This leads to the operation of Java boxing. We go to the analysis with questions.

Packing (valueOf ()) public static Integer valueOf (int I) {/ /-128127 if (I > = IntegerCache.low & & I = 127;} private IntegerCache () {}} public static Integer valueOf (int I) {if (I > = IntegerCache.low & & I)

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