Method studentLearnMonitor

src/test/java/Monitor.java:7–29

()

    final static ClassPool pool = ClassPool.getDefault();
    final static String classname = "examples.Student";
    public void studentLearnMonitor() throws Exception{
        CtClass ss = pool.getCtClass(classname);
        CtClass.debugDump="./dump";
        String methodname = "learn";
        CtMethod learn_ori = ss.getDeclaredMethod(methodname);
        //拷贝一份learn方法
        CtMethod learn_cp = CtNewMethod.copy(learn_ori,learn_ori.getName()+"_cp",ss,null);
        //添加拷贝后的方法
        ss.addMethod(learn_cp);
        //修改learn方法：原代码前后添加时间
        String src = "{"+
                "long start = System.currentTimeMillis();" +
                learn_ori.getName()+"_cp($$);"+
                "long end = System.currentTimeMillis();"+
                "System.out.println(end-start);"+
                "}";
        learn_ori.setBody(src);
        ss.toClass();
        //生成.class文件，主要用于调试，查看是否有代码片段被忽略
        //ss.writeFile();
        Student s = new Student();
        s.learn();
    }

    public void studentDisplayMonitor() throws Exception{
        CtClass ss = pool.getCtClass(classname);