java反射调用方法时，Class . can not access a member of class . with modifiers "private" 等异常解决

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先看javabean类：目的使用反射调用私有方法：

package com.imooc.reflect;public class Student {    private void add(){        System.out.println("增加数据！");    }    private int id;    private String name;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Student(int id, String name) {        super();        this.id = id;        this.name = name;    }    public Student() {    }}

main测试方法

public static void main(String[] args) throws Exception {        Class c1=Student.class;        Object obj=(Object)c1.newInstance();        Method  add = c1.getDeclaredMethod("add");        add.invoke((Student)obj);    }

这时，就会报Class . can not access a member of class . with modifiers “private” 异常。
解决方案：添加一行代码：add.setAccessible(true);

Method  add = c1.getDeclaredMethod("add");add.setAccessible(true);add.invoke((Student)obj);

当然最后调用时也可以写成：add.invoke(obj);

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