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preface Performance tuning of Java virtual machine is a very broad topic and a very difficult process in practice. Because it needs a systematic optimization method and clear optimization expectations. The default JVM parameters attempt to provide acceptable performance in most cases; However, depending on the behavior of the application and t ...

Use of reflection 1: reflection of Constructor Again, we can construct a new Student through a public null parameter, but we cannot construct a new private full parameter. Student student = new Student(); Now let's construct the reflection constructor (create an instance in the form of reflection) public static void main(String[] args ...

4. Enable threads to modify time 5. Thread synchronization to achieve stopwatch function 6. Run and debug Hello, everyone, I'm the grey ape! Today I share with you an electronic watch project developed using Java multithreading, which can realize the real-time display and modification of time in the electronic watch and the function of st ...

Build the test framework and analyze the framework directory config: configuration file. Put all project related configurations in this folder. python supports yaml and ini ini file introduction Start with [section] End with [option=value] Remarks in; start The section name cannot be duplicated Introduction to yaml file Starting with ...

preface Hello, CSDN friends! I'm Marmon! Several articles have been posted before, although they have brought me a lot of fans, But it also brought some disputes (people with low self-esteem dare not reply...)! The big man in the screenshot below probably hasn't read my previous articles. I just have a new man who has just changed his career ...

First offer a picture, you can think about why? introduce equals() is used to determine whether two objects are equal. hashCode() is used to obtain hash code, also known as hash code; It actually returns an int integer. This hash code is used to determine the index position of the object in the hash table. relationship We use "class ...

Now the question comes. Is JSP really old in 2020? Yes, it's really old Now the question comes again. Why is the technology that has been defined as "old" a few years ago still hot by 2020? Every year, someone still asks, "do you still need to learn jsp?". I think the reason is also very simple: JSP was really used before! ...

1, Basic knowledge 1) Why learn java 8 The changes made by Java 8 are more far-reaching in many ways than any change in Java history. These changes will make your programming easier example: Traditional writing: List<Person> personList = Arrays.asList(new Person(21,50),new Person(22,55),new Person(23,60)); Collections.sort(personLi ...

It's very simple here. Only one is maintained internally `byte` Type `data` Array, actually `byte` It still occupies as much as one byte and can be optimized into `bit`Instead, it is only used to facilitate simulation. In addition, I created three different`hash`Function is actually a reference`HashMap`Hash jitter method, respectively, using it ...

 We all know`StringBuffer`It is thread safe because its key methods are added`synchronized`，However, it can be seen from the print result that the lock is eliminated. because`buffer`This reference will only be ...