Java uses agent to implement the code example before the main method

This article mainly introduces relevant information about the detailed examples before Java uses agent to implement the main method. I hope this article can help everyone understand this part of the content. Friends in need can refer to it

Java uses agent to implement the detailed example before the main method

Create the Agent project

PreMainExecutor class, execute this method before the main method

public class PreMainExecutor {

  public static void premain(String agentOps, Instrumentation inst){
    System.out.println("premain execute..........");
  }

}

META- INF/MANIFEST.MF

Manifest-Version: 1.0
Premain-Class:test.agent.PreMainExecutor

is packaged into JavaAgent.jar and placed on the D drive.

Test class

Test class.

public class Test {

  public static void main(String[] args){
    System.out.println("main..........");
  }

}

Execution

java -javaagent:JavaAgent.jar Test

Output

premain execute..........
main..........

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