solid principles java

Here is a simple way to share the Java and JVM operating principles, the Java language written by the Java compiler, the source program compiled into a platform-independent ' bytecode program ' (. class file, that is, 0, 12 binary), and then in the Java interpreter above the

The reason why an exception is a powerful debugging tool is that it answers the following three questions: 1, what went wrong? 2, where is the fault? 3, why the error? In cases where an exception is used effectively, the exception type answers "What" is thrown, and the exception stack trace answers "where" is thrown, and the exception message answers "Why" is thrown, and if your exception does not answer all of the above questions, then you may not be able to use them well. There are three

Diagram of SWT technical principles: We can see that the SWT class relationship is very direct and easy to understand. It is a bit like Delphi's API interface idea (this is what I casually play, it has nothing to do with Delphi ). The most important thing is the core idea of SWT: The implementation of SWT functions is completely built on JNI-based and directly called and encapsulated on the operating platform.We can see that the SWT function is not o

with C, Perl, and other languages in terms of underlying or parallel distributed computing operations. If you still doubt the performance of Java, it means that your ideas and ideas are completely outdated. Java should be defined in a new term in a year or two. Since jdk1.5, we have to provide support for new performance such as threads and concurrency. Java app

pointer two:Handle: The Java heap will draw a chunk of memory as the handle pool, and the reference stores the handle address of the object, and the handle contains the individual address information for the object instance data and the type data. ：Direct pointer: The layout of the Java heap object considers how to place information about the access type data, which is the object address stored in the refe

pointer two:Handle: The Java heap will draw a chunk of memory as the handle pool, and the reference stores the handle address of the object, and the handle contains the individual address information for the object instance data and the type data. ：Direct pointer: The layout of the Java heap object considers how to place information about the access type data, which is the object address stored in the refe

aligned by aligning the padding.Access positioning of objectsThe Java program uses the reference data on the stack to manipulate the concrete objects on the heap. The main access methods are the use of a handle and a direct pointer two:Handle: The Java heap will draw a chunk of memory as the handle pool, and the reference stores the handle address of the object, and the handle contains the individual addre

Java Concurrent Programming Series: Java concurrency Programming: core theory Java Concurrency Programming: synchronized and its implementation principles Java concurrency Programming: Synchronized bottom-level optimization (lightweight lock, biased lock)

actually stored by the object, as well as the various types of field content defined in the program code.The alignment padding does not necessarily exist, only the placeholder function. , the hotpot VM requires that the object start address must be an integer multiple of 8 bytes, the object header portion is exactly a multiple of 8 bytes, so when the instance data part is not aligned, it needs to be aligned by aligning the padding.Access positioning of objectsThe

When writing code, we often mention two principles: 1. the method should be as short as possible, and the large method should be divided into small ones; 2. Do not reinvent the wheel. When we emphasize these two principles, we often focus only on the Code concise, easy to maintain, and other factors that facilitate us. In fact, this can also greatly facilitate the Java