一、項目上校驗空和空集合地方非常多，可以編寫一個工具類統一校驗

package com.moy.custom.utils;

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

/**
 * [Project]:moy-gradle-project  <br/>
 * [Email]:[email protected]  <br/>
 * [Date]:2018/1/31  <br/>
 * [Description]: 常用判空操作 <br/>
 *
 * @author YeXiangYang
 */
public
 
 abstract class NullUtils {

    /**
     * 對象是空，返回<tt>true<tt/>
     */
    public static boolean objectIsNull(Object obj) {
        return null == obj;
    }

    /**
     * 對象不是空，返回<tt>true<tt/>
     */
    public static boolean objectIsNotNull(Object obj) {
        return !objectIsNull(obj);
    }

    
 
/**
     * 集合是空或者個數小於零，返回<tt>true<tt/>
     */
    public static boolean collectionIsNull(Collection collection) {
        return null == collection || (collection.size() <= 0);
    }

    /**
     * 集合不是空並且個數大於零，返回<tt>true<tt/>
     */
    public static boolean collectionIsNotNull(Collection collection) {
        
 
return !collectionIsNull(collection);
    }

    /**
     * Map是空或者個數小於零，返回<tt>true<tt/>
     */
    public static boolean mapIsEmpty(Map map) {
        return null == map || (map.size() <= 0);
    }

    /**
     * map不是空並且個數大於零，返回<tt>true<tt/>
     */
    public static boolean mapIsNotEmpty(Map map) {
        return !mapIsEmpty(map);
    }

    /**
     * CharSequence是空或者長度小於零，返回<tt>true<tt/>
     */
    public static boolean charSequenceIsEmpty(CharSequence charSequence) {
        return null == charSequence || (charSequence.length() <= 0);
    }

    /**
     * CharSequence不是空並且長度大於零，返回<tt>true<tt/>
     */
    public static boolean charSequenceIsNotEmpty(CharSequence charSequence) {
        return !charSequenceIsEmpty(charSequence);
    }

}

yexiangyang

[email protected]

常用判空操作工具類