generator class with javassist lib.

MyClassGeneratorByJavassist.java

public class MyClassGeneratorByJavassist {
  
    public static void main(String[] args) throws Exception {  
        ClassPool pool = ClassPool.getDefault();
        //创建Programmer类       
        CtClass cc= pool.makeClass("com.samples.Programmer");
        //定义code方法  
        CtMethod method = CtNewMethod.make("public void code(){}", cc);
        //插入方法代码  
        method.insertBefore("System.out.println(\"I'm a Programmer,Just Coding.....\");");  
        cc.addMethod(method);  
        //保存生成的字节码  
        cc.writeFile(System.getProperty("user.home") + "/Desktop");
    }  
}