為實體類擴充套件欄位col 賦值，擴充套件欄位不確定多少，傳入陣列元素不確定，這時我們用到了反射的方法，遍歷進行賦值。

package com.dream.bean;

import java.lang.reflect.Method;

public class Student {
    //固定欄位
    private  String  name;

    //  擴充套件欄位，未知
    private  Object  col1;
    private  Object  col2;

    public String getName() {
        return name;
    }

    
 
public void setName(String name) {
        this.name = name;
    }

    public Object getCol1() {
        return col1;
    }

    public void setCol1(Object col1) {
        this.col1 = col1;
    }

    public Object getCol2() {
        return col2;
    }

    public void setCol2(Object col2) {
        
 
this.col2 = col2;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", col1=" + col1 +
                ", col2=" + col2 +
                '}';
    }

    private    void   init(Object[]  arrs) throws Exception {
        Class
 
<? extends Student> stuClass = this.getClass();
        for(int i=0;i<arrs.length;i++){
            String  methodName="setCol"+(i+1);
            Method method = stuClass.getDeclaredMethod(methodName, Object.class);
            method.setAccessible(true);
            method.invoke(this,arrs[i]);
        }
    }
    public  Student(String name,Object[] arrs) throws Exception {
        this.name=name;
        init(arrs);
    }
}