Example code about Java reflection mechanism

public static void main(String[] args) throws ClassNotFoundException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, InstantiationException {
//

Requirement: Execute all methods starting with test in the class

    Scanner in = new Scanner(System.in);
    String className = in.nextLine();
    //动态加载类
    Class<?> clas = Class.forName(className);
    Method[] methods = clas.getMethods();//继承 公共方法
    Method[] declaredMethods = clas.getDeclaredMethods();//非继承 所有方法
    
    //创建一个不可重复集合set
    Set<Method> set = new HashSet<Method>();
    for (Method method : methods) {
        set.add(method);
    }
    for (Method method : declaredMethods) {
        set.add(method);
    }
    
    //创建一个list集合存储以该类中所有以test开头的方法
    List<Method> list = new ArrayList<Method>();
    for (Method method : set) {
        //System.out.println(method);   //打桩
        if (method.getName().startsWith("test")) {
            list.add(method);
        }
    }
    
    for (Method method : list) {
        //System.out.println(method);
        //invoke是方法执行完毕返回的对象
        Object invoke = method.invoke(clas.newInstance(), null);
        System.out.println("执行完毕");
    }
    
}

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