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list按属性值排序 userList.sort(Comparator.comparing(Use::getNumber)); 对象 package com.rpmc.demo; public class Use { private int number; private String name; public int getNumber() { return number; } public void setNumber(int numbe

list List lastTsrList 迭代器 Iterator<Integer> it_tsr = lastTsrList.iterator(); remove while (it_tsr.hasNext()) { Integer ss = it_tsr.next(); if (!TsrmDataGlobal.allTsrMap.containsKey(ss)) {

实体类重写equals（）方法 package com.rpmc.demo.protoEntity.tsrm.section; import java.util.Objects; public class TsrSection { private int lineId;//线路id private int sectionId;//区段id private int tsrId;//限速id public int getLineId() { return

list Collections.frequency(list集合,元素)方法。 for (String name : nameList) { //name在nameList出现的次数 int count = Collections.frequency(nameList,name); }

第一种：去掉重复乱序 List<SectionDirectionControlOrderExport> secDirOrderList = new ArrayList<>(); SectionDirectionControlOrderExport secDirOrder = new SectionDirectionControlOrderExport(); secDirOr...