几个常见的utils

package com.cn.utils;

import java.util.Collection;
import java.util.Map;

/**
 * 空判断的实现
 */
public class PublicUtil {
    /**
     * 判断对象是否Empty(null或元素为0)
     * 实用于对如下对象做判断:String Collection及其子类 Map及其子类
     * @param pObj 待检查对象
     * @return boolean 返回的布尔值
     */
    public static boolean isEmpty(Object pObj) {
        if (pObj == null) {
            return true;
        }
        if (pObj == "") {
            return true;
        }
        if (pObj instanceof String) {
            return ((String) pObj).length() == 0;
        } else if (pObj instanceof Collection) {
            return ((Collection) pObj).isEmpty();
        } else if (pObj instanceof Map) {
            return ((Map) pObj).size() == 0;
        }
        return false;
    }

    /**
     * 判断对象是否为NotEmpty(!null或元素大于0)
     * 实用于对如下对象做判断:String Collection及其子类 Map及其子类
     * @param pObj 待检查对象
     * @return boolean 返回的布尔值
     */
    public static boolean isNotEmpty(Object pObj) {
        if (pObj == null) {
            return false;
        }
        if (pObj == "") {
            return false;
        }
        if (pObj instanceof String) {
            return ((String) pObj).length() != 0;
        } else if (pObj instanceof Collection) {
            return !((Collection) pObj).isEmpty();
        } else if (pObj instanceof Map) {
            return ((Map) pObj).size() != 0;
        }
        return true;
    }
}
package com.cn.utils;

i