反射 Reflection

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下面是一个简单反射类的应用

学生类

public class Student {    private Student(){    }    public Student(String stuid){        this.stuid = stuid;    }    private String stuid;    public String getStuid() {        return stuid;    }    public void setStuid(String stuid) {        this.stuid = stuid;    }    private void getPicName(String pic){        System.out.println(pic);    }    @Override    public String toString() {        return "Student [stuid=" + stuid + "]";    }}

反射调用

public class Realize {    public static void main(String[] args) {        try {            //get public Constructor            Class<?> c = Class.forName("com.test.ref.Student");            Constructor<?> constructor = c.getConstructor(String.class);            Object obj = constructor.newInstance("this is my test example");                System.out.println(obj.toString());            //get private Constructor            Constructor<?> co = c.getDeclaredConstructor();            //private constructor need to access            co.setAccessible(true);            obj = co.newInstance();             System.out.println(obj.toString());            //get method            Method method = obj.getClass().getDeclaredMethod("getPicName", String.class);            method.setAccessible(true);            //get all method             Method[] methods = obj.getClass().getDeclaredMethods();            for (Method mm : methods) {                System.out.println("method name : " + mm.getName());            }            //get the parameters of the specified method            Class<?>[] paramClasses = method.getParameterTypes() ;            for (Class<?> class1 : paramClasses) {                System.out.println("parameter type: " + class1.getName());            }            // whether it is a private method            System.out.println(method.getName() + " is private "                    + Modifier.isPrivate(method.getModifiers()));            //call method            method.invoke(obj, "Let me think");            // get all field            Field[] publicFields = obj.getClass().getDeclaredFields();            for (Field field : publicFields) {                System.out.println("field name : " + field.getName());            }        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}

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