Method studentDisplayMonitor

src/test/java/Monitor.java:31–63

()

    }

    public void studentDisplayMonitor() throws Exception{
        CtClass ss = pool.getCtClass(classname);
        CtClass.debugDump="./dump";
        //添加字段name
        CtField param = new CtField(pool.get("java.lang.String"),"name", ss);
        // 访问级别是 private
        param.setModifiers(Modifier.PRIVATE);
        // 初始值是 "Frankyu"
        ss.addField(param, CtField.Initializer.constant("Frankyu"));
        String methodname = "display";
        CtMethod display = ss.getDeclaredMethod(methodname);
        String src = "{"+
                "System.out.println($0.age);" +
                "$0.name=\"frankyu\";" +
                "System.out.println($0.name);"+
                "}";
        display.insertBefore(src);
        if(true){
            System.out.println("Hello javassist + 1");
        }
        src ="if(true){" +
                "System.out.println(\"Hello javassist +2\");" +
                "}";
        display.insertAt(7,src);
        src = "{"+
                "System.out.println($0.grade);"+
                "}";
        display.insertAfter(src);
        ss.toClass();
        //ss.writeFile();
        Student s = new Student();
        s.display();
    }

    public static void main(String[] args) throws Exception{
        Monitor m = new Monitor();