初始内省Introspection_内省 introspection-优快云博客

本文通过实现一个简单的Introspection类，详细解释了如何使用Java反射API进行字段的读取和写入操作，包括getters和setters方法的定义与使用。

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感觉是是可以从字段(field)可以获取,字段的读方法,和写方法,(当然要读写方法都要按照规则写)

package introspection;

public class Introspection {
    private int x;
    private int y;

    public int getX() {
        return x;
    }

    public void setX(int x) {
        this.x = x;
    }

    public int getY() {
        return this.y;
    }

    public void setY(int y) {
        this.y = y;
    }

    public Introspection(int x, int y) {
        this.x = x;
        this.y = y;
    }
}

package introspection;

import java.beans.*;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class TestNeixing {
    public static void main(String[] args) throws IntrospectionException, IllegalArgumentException, IllegalAccessException,
            InvocationTargetException {
        Introspection introspection = new Introspection(45, 34);
        String propertyName = "x";
        PropertyDescriptor pd = new PropertyDescriptor(propertyName, introspection.getClass());
        Method methodGetX = pd.getReadMethod();
        Object obj = methodGetX.invoke(introspection);
        System.out.println(obj);

        Method methodSetX = pd.getWriteMethod();
        methodSetX.invoke(introspection, 7);
        System.out.println(introspection.getX());
    }
}