Part 1 of jvm - class loading subsystem

Title: JVM Part 1 - Class Loading Subsystem

Reference blog: Reference blog
Reference video: Reference video
The official account is: This is the first time I try this official account, so it is still in the initial stage, I hope you can pay attention and support.

Read the instructions:

• You can start with 4.2 of the second point and the fourth point to see the test cases;
• Through the analysis of test cases, so as to read this article from the beginning,
• When reading, you can take a general look, mainly to understand

1. Class loading subsystem

1 Overview

2. Loading phase

3. Linking stage

3.1 Verification

3.2 preparation

3.3 Analysis

4. Initialization phase

2. Classification of class loaders

1. Two class loaders

2. Test cases

3. The loader that comes with the virtual machine

3.1 Start class loader

3.2 Extended class loader

3.3 System class loader

3.4 User-defined class loader

4. Parental delegation mechanism

4.2 Test 1

4.3 Test 2

Variation of test two

Summary of the previous two tests

4.4 Test three:

4.5 Advantages of Parental Delegation Mechanism

5. Sandbox security mechanism

6. Other

7. Active and passive use of classes