list对象转数组 package com.example.core.mydemo.json5; import org.apache.commons.collections4.CollectionUtils
List target的拷贝 import cn.hutool.core.util.StrUtil; import com.google.common.collect.Lists; import org.apache.commons.collections4
import java.util.List; import java.util.Map; import java.util.Set; import java.util.TreeSet; import org.apache.commons.collections4
com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy; import com.qunar.base.meerkat.util.DateUtil; import lombok.extern.slf4j.Slf4j; import org.apache.commons.collections4
示例代码： import org.apache.commons.collections4.CollectionUtils; import org.springframework.stereotype.Service...示例代码2： import org.apache.commons.collections4.CollectionUtils; import org.springframework.stereotype.Service
封装重试策略 package com.github.chujianyun.simpleretry4j; import lombok.Data; import org.apache.commons.collections4...} } 封装重试工具类 package com.github.chujianyun.simpleretry4j; import lombok.extern.slf4j.Slf4j; import org.apache.commons.collections4
java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.commons.collections4
objectObjectHashMap = Maps.newHashMapWithExpectedSize(16); StringUtils org.apache.commons.lang3 CollectionUtils org.apache.commons.collections4....CollectionUtils MapUtils org.apache.commons.collections4.CollectionUtils Collections.emptyList(); Collections.emptySet
主要看明白思路就行，代码细节并不重要) package cn.cnblogs.yjmyzz.zookeeper; import org.I0Itec.zkclient.ZkClient; import org.apache.commons.collections4
pub.dsb.framework.boot.webmvc.configuration; import com.google.common.base.Predicate; import com.google.common.base.Predicates; import org.apache.commons.collections4
import org.apache.commons.collections4.CollectionUtils; List list1 = Arrays.asList(1, 2, 3,
} } return paramsObject; } } import lombok.extern.slf4j.Slf4j; import org.apache.commons.collections4
; } } } 2.5 校验链 package com.chujianyun.component; import org.apache.commons.collections4
function; import com.google.common.base.Preconditions; import com.google.common.collect.Lists; import org.apache.commons.collections4
StringUtils.isBlank(str3)) { System.out.println("str3 is blank or null"); } } } import org.apache.commons.collections4
com.hafiz.www.shiro; import com.hafiz.www.po.UserEntity; import com.hafiz.www.service.UserService; import org.apache.commons.collections4
com.alibaba.fastjson.JSONObject; import com.google.common.base.Splitter; import com.google.common.collect.Lists; import org.apache.commons.collections4
import com.cube.share.sms.model.param.SmsPlaceHolderParameter; import lombok.extern.slf4j.Slf4j; import org.apache.commons.collections4
com.elvis.easyexcel.listener.ObjectListener; import com.elvis.easyexcel.model.Demo; import lombok.extern.slf4j.Slf4j; import org.apache.commons.collections4
(list == null || list.isEmpty()); 建议方案： import org.apache.commons.collections4.CollectionUtils; CollectionUtils.isNotEmpty
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