"DAY23" JVM with reflective learning notes

Jvm:

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1.jvm:java virtual machine.

2.class file

*.class

3.ClassLoader

4.runtime Data area

The run-time data area.

1.Method Area: Method zone. (shared)

Shared for all threads.

2.heap (Shared):

Shared for all threads.

3.java stack (stack area)

Exclusive.

4.native method Stack (local methods stack)

Exclusive

5.Program Counter Register

Program counter.

5.execute engine

Execution engine.

6.native interface

Local interface

7.native Libraries

Local class Library

Jvisualvm

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1. Using the JVISUALVM tool that comes with the JDK

${java_home}/bin/jvisualvm.exe software.

2. Writing procedures

Class.forName ("xx.xx.xxx.Xxxx");

Class.forName ("Xx.xx.xxx.Xxxx", False,xxx.class.getclassloader ());

Java Reflection

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Dynamically accesses the properties and methods of an object.

1.java.lang.reflect

2.java.lang.class: Class class, Class descriptor, describes the appearance.

3.java.lang.reflect.method

A method descriptor that describes the characteristics of a method.

4.java.lang.reflect.field

field that describes the characteristics of the field.

5.java.lang.reflect.constructor

Constructors

6.java.lang.reflect.modifier

Modifier.

Class Cat{private string color;p rivate string name;//...get/setxxxprivate Cat (String color,string name) {//this.xxx ...} public void Catchmouse () {System.out.println ("xxxx");}}

1. Create a Cat object by reflection mode.

2. The reflection method calls the Catchmouse () method.

3. The reflection mode is assigned a value of name and color.

"DAY23" JVM with reflective learning notes