ListUtil

package com.kaishengit.Util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

/**
 * Created with IntelliJ IDEA.
 * User: niu
 * Date: 13-9-26
 * Time: 下午7:51
 * To change this  template use File | Settings | File Templates.
 */
public class ListUtil<T> {

    /**
     * 在给定的List集合中，查询符合要求的对象，并将其添加到一个新的List集合中
     * 自定义数据类型需要重写 equals 方法
     * @param list 要查询的list
     * @param str 对象的属性名,用“.”分开
     * @param value the value to compare
     * @return 符合要求的List集合
     */
    public List<T> hasContain(List<T> list, String str, Object value) {
        if (list == null)
            throw new RuntimeException("传入的 list 为 null");

        List<T> resultList;
        resultList = new ArrayList<T>();


        if (list.size() == 0)
            return resultList;

        T obj;
        Object result;

        StringBuilder stringBuffer = new StringBuilder();
        String[] porpos = str.split("\\.");
        System.out.println("解析得到的方法：");
        for (int i = 0 ; i < porpos.length ; i++) {
            String first = porpos[i].substring(0,1);
            stringBuffer.append("get");
            stringBuffer.append(first.toUpperCase());
            stringBuffer.append(porpos[i].substring(1));
            porpos[i] =  stringBuffer.toString();
            stringBuffer.setLength(0);
            System.out.println(porpos[i] + ",  ");

        }

        for (T aList : list) {
            obj = aList;
            result = obj;
            for (String porpo : porpos) {

                result = invokeMethod(result,  result.getClass(), porpo);
                if (result == null)
                    return resultList;
            }
            System.out.println("遍历对象：" + aList + "   期望值：" + value + "   结果：" + result);
            if (value.equals(result)) {
                System.out.println("添加对象：" + aList);
                resultList.add(obj);
            }

        }
        System.out.println("共添加 " + resultList.size() + " 个对象");
        return resultList;

    }


    @SuppressWarnings("unchecked")
    private Object invokeMethod(Object instanceObj, Class clazz, String methodName) {

        Object result = null;
        try {
            System.out.println( instanceObj.getClass());
            System.out.println(methodName);
            Method method = clazz.getMethod(methodName);
            result = method.invoke(instanceObj);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        }

        return result;

    }

    public List<T> addToList(T...obj) {
        List<T> result = new ArrayList<T>();
        for (T t : obj) {
            result.add(t);
        }
        return result;

    }

    public List<T> listAddList(List<T> base, List<T>...lists){

        for (List<T> list : lists) {
            for (T t : list) {
                base.add(t);
            }
        }
        return base;
    }
}

go go study....