java中List集合迭代

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原创最新推荐文章于 2026-07-16 15:58:25 发布 945 阅读 AI 写同款· GEO 优化 ›

java基础--迭代list集合的效率对比迭代一般有三种方法： 1、for循环； 2、增强型for循环； 3、迭代器。那么使用哪一种方法效率是最高的呢？下面直接奉上代码 package com.company; import java.util.ArrayList; import java.util.Iterator; import java.util.List; public class Demo11 { public long itor(List list){ /*迭代器*/ long start 阅读详情

for(Iterator<returnTicket> it = rtList.iterator(); it.hasNext();){
returnTicket mp=it.next();
if(mp.getRtIList().size()==0){
it.remove();
}
else
{
if(it.hasNext())
{
String pn = "";
String ph = "";
orders+="{\"OrderID\":"+mp.getOrderId()+"," +
"\"ReturnType\": \""+mp.getReturnType()+"\"," +
"\"ReturnFlag\": \""+mp.getReturnFlag()+"\"," +
"\"Pnr\": \""+mp.getPnr()+"\",";
for(int j = 0;j<mp.getRtIList().size();j++)
{

if(j == mp.getRtIList().size()-1)
{
pn += mp.getRtIList().get(j).getPassengerName();
ph +=mp.getRtIList().get(j).getTicketNo();
}
else
{
pn += mp.getRtIList().get(j).getPassengerName()+",";
ph +=mp.getRtIList().get(j).getTicketNo()+",";
}

}

orders+=
"\"TicketNo\": \""+ph+"\"," +
"\"PassengerName\": \""+pn+"\"," +
"\"TsalePrice\": \""+mp.getRtIList().get(0).getTsalePrice()+"\"," +
"\"TAirConFee\": \""+mp.getRtIList().get(0).getTFuelSurcharge()+"\"," +
"\"TFuelSurcharge\": \""+mp.getRtIList().get(0).getTFuelSurcharge()+"\"," +
"\"TServiceFee\":\""+mp.getRtIList().get(0).getTServiceFee()+"\"," +
"\"TInsurPrice\": \""+mp.getRtIList().get(0).getInsurPrice()+"\"," +
"\"TComcharge\": \""+mp.getRtIList().get(0).getReturnMoney()+"\","+
"\"RefundPrice\": \""+mp.getRefundPrice()+"\","+
"\"ReturnTime\": \""+mp.getReturnTime()+"\","+
// "\"Applicant\": \""+mp.getApplicant()+"\","+
"\"ApplyTime\": \""+mp.getApplyTime()+"\"},";
}
else
{
String pn = "";
String ph = "";
orders+="{\"OrderID\":"+mp.getOrderId()+"," +
"\"ReturnType\": \""+mp.getReturnType()+"\"," +
"\"ReturnFlag\": \""+mp.getReturnFlag()+"\"," +
"\"Pnr\": \""+mp.getPnr()+"\",";
for(int j = 0;j<mp.getRtIList().size();j++)
{
if(j == mp.getRtIList().size()-1)
{
pn += mp.getRtIList().get(j).getPassengerName();
ph +=mp.getRtIList().get(j).getTicketNo();
}
else
{
pn += mp.getRtIList().get(j).getPassengerName()+",";
ph +=mp.getRtIList().get(j).getTicketNo()+",";
}
}
orders+=
"\"TicketNo\": \""+ph+"\"," +
"\"PassengerName\": \""+pn+"\"," +
"\"TsalePrice\": \""+mp.getRtIList().get(0).getTsalePrice()+"\"," +
"\"TAirConFee\": \""+mp.getRtIList().get(0).getTFuelSurcharge()+"\"," +
"\"TFuelSurcharge\": \""+mp.getRtIList().get(0).getTFuelSurcharge()+"\"," +
"\"TServiceFee\":\""+mp.getRtIList().get(0).getTServiceFee()+"\"," +
"\"TInsurPrice\": \""+mp.getRtIList().get(0).getInsurPrice()+"\"," +
"\"TComcharge\": \""+mp.getRtIList().get(0).getReturnMoney()+"\","+
"\"RefundPrice\": \""+mp.getRefundPrice()+"\","+
"\"ReturnTime\": \""+mp.getReturnTime()+"\","+
// "\"Applicant\": \""+mp.getApplicant()+"\","+
"\"ApplyTime\": \""+mp.getApplyTime()+"\"}";
}
}

}

注：

it.remove(); 移除不符要求的对象，it.hasNext()判断是否是最后一个对象

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