我上课了
package com.firstgroup.bbrailapps.pushport.timetable;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElements;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import javax.xml.datatype.XMLGregorianCalendar;
/**
* <p>Java class for anonymous complex type.
*
* <p>The following schema fragment specifies the expected content contained within this class.
*
* <pre>
* <complexType>
* <complexContent>
* <restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
* <sequence>
* <choice maxOccurs="unbounded" minOccurs="2">
* <element ref="{http://www.thalesgroup.com/rtti/XmlTimetable/v7/rttiCTTSchema.xsd}OR"/>
* <element ref="{http://www.thalesgroup.com/rtti/XmlTimetable/v7/rttiCTTSchema.xsd}IP"/>
* <element ref="{http://www.thalesgroup.com/rtti/XmlTimetable/v7/rttiCTTSchema.xsd}DT"/>
* <element ref="{http://www.thalesgroup.com/rtti/XmlTimetable/v7/rttiCTTSchema.xsd}PP"/>
* </choice>
* <element ref="{http://www.thalesgroup.com/rtti/XmlTimetable/v7/rttiCTTSchema.xsd}AS" maxOccurs="unbounded" minOccurs="0"/>
* </sequence>
* <attribute name="rid" use="required" type="{http://www.thalesgroup.com/rtti/XmlTimetable/v7/rttiCTTSchema.xsd}RIDType" />
* <attribute name="uid" type="{http://www.thalesgroup.com/rtti/XmlTimetable/v7/rttiCTTSchema.xsd}UIDType" />
* <attribute name="ssd" use="required" type="{http://www.thalesgroup.com/rtti/XmlTimetable/v7/rttiCTTSchema.xsd}RTTIDateType" />
* <attribute name="trainId" type="{http://www.thalesgroup.com/rtti/XmlTimetable/v7/rttiCTTSchema.xsd}TrainIdType" />
* <attribute name="toc" type="{http://www.thalesgroup.com/rtti/XmlTimetable/v7/rttiCTTSchema.xsd}TOCType" />
* <attribute name="qtrain" type="{http://www.w3.org/2001/XMLSchema}boolean" default="false" />
* <attribute name="status" use="required" type="{http://www.thalesgroup.com/rtti/XmlTimetable/v7/rttiCTTSchema.xsd}CIFTrainStatusType" />
* <attribute name="trainCat" use="required" type="{http://www.thalesgroup.com/rtti/XmlTimetable/v7/rttiCTTSchema.xsd}CIFTrainCategoryType" />
* <attribute name="deleted" type="{http://www.w3.org/2001/XMLSchema}boolean" default="false" />
* <attribute name="can" type="{http://www.w3.org/2001/XMLSchema}boolean" default="false" />
* </restriction>
* </complexContent>
* </complexType>
* </pre>
*
*
*/
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"orOrIPOrDT",
"as"
})
@XmlRootElement(name = "Journey")
public class Journey {
@XmlElements({
@XmlElement(name = "OR", type = OR.class),
@XmlElement(name = "PP", type = PP.class),
@XmlElement(name = "IP", type = IP.class),
@XmlElement(name = "DT", type = DT.class)
})
protected List<Object> orOrIPOrDT;
@XmlElement(name = "AS")
protected List<AS> as;
@XmlAttribute(required = true)
protected String rid;
@XmlAttribute
protected String uid;
@XmlAttribute(required = true)
protected String ssd;
@XmlAttribute
protected String trainId;
@XmlAttribute
protected String toc;
@XmlAttribute
protected Boolean qtrain;
@XmlAttribute(required = true)
protected String status;
@XmlAttribute(required = true)
protected String trainCat;
@XmlAttribute
protected Boolean deleted;
@XmlAttribute
protected Boolean can;
/**
* Gets the value of the orOrIPOrDT property.
*
* <p>
* This accessor method returns a reference to the live list,
* not a snapshot. Therefore any modification you make to the
* returned list will be present inside the JAXB object.
* This is why there is not a <CODE>set</CODE> method for the orOrIPOrDT property.
*
* <p>
* For example, to add a new item, do as follows:
* <pre>
* getOROrIPOrDT().add(newItem);
* </pre>
*
*
* <p>
* Objects of the following type(s) are allowed in the list
* {@link OR }
* {@link PP }
* {@link IP }
* {@link DT }
*
*
*/
public List<Object> getOROrIPOrDT() {
if (orOrIPOrDT == null) {
orOrIPOrDT = new ArrayList<Object>();
}
return this.orOrIPOrDT;
}
/**
* Gets the value of the as property.
*
* <p>
* This accessor method returns a reference to the live list,
* not a snapshot. Therefore any modification you make to the
* returned list will be present inside the JAXB object.
* This is why there is not a <CODE>set</CODE> method for the as property.
*
* <p>
* For example, to add a new item, do as follows:
* <pre>
* getAS().add(newItem);
* </pre>
*
*
* <p>
* Objects of the following type(s) are allowed in the list
* {@link AS }
*
*
*/
public List<AS> getAS() {
if (as == null) {
as = new ArrayList<AS>();
}
return this.as;
}
/**
* Gets the value of the rid property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getRid() {
return rid;
}
/**
* Sets the value of the rid property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setRid(String value) {
this.rid = value;
}
/**
* Gets the value of the uid property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getUid() {
return uid;
}
/**
* Sets the value of the uid property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setUid(String value) {
this.uid = value;
}
/**
* Gets the value of the ssd property.
*
* @return
* possible object is
* {@link XMLGregorianCalendar }
*
*/
public String getSsd() {
return ssd;
}
/**
* Sets the value of the ssd property.
*
* @param value
* allowed object is
* {@link XMLGregorianCalendar }
*
*/
public void setSsd(String value) {
this.ssd = value;
}
/**
* Gets the value of the trainId property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getTrainId() {
return trainId;
}
/**
* Sets the value of the trainId property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setTrainId(String value) {
this.trainId = value;
}
/**
* Gets the value of the toc property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getToc() {
return toc;
}
/**
* Sets the value of the toc property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setToc(String value) {
this.toc = value;
}
/**
* Gets the value of the qtrain property.
*
* @return
* possible object is
* {@link Boolean }
*
*/
public Boolean isQtrain() {
return qtrain;
}
/**
* Sets the value of the qtrain property.
*
* @param value
* allowed object is
* {@link Boolean }
*
*/
public void setQtrain(Boolean value) {
this.qtrain = value;
}
/**
* Gets the value of the status property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getStatus() {
return status;
}
/**
* Sets the value of the status property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setStatus(String value) {
this.status = value;
}
/**
* Gets the value of the trainCat property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getTrainCat() {
return trainCat;
}
/**
* Sets the value of the trainCat property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setTrainCat(String value) {
this.trainCat = value;
}
/**
* Gets the value of the deleted property.
*
* @return
* possible object is
* {@link Boolean }
*
*/
public Boolean isDeleted() {
return deleted;
}
/**
* Sets the value of the deleted property.
*
* @param value
* allowed object is
* {@link Boolean }
*
*/
public void setDeleted(Boolean value) {
this.deleted = value;
}
/**
* Gets the value of the can property.
*
* @return
* possible object is
* {@link Boolean }
*
*/
public Boolean isCan() {
return can;
}
/**
* Sets the value of the can property.
*
* @param value
* allowed object is
* {@link Boolean }
*
*/
public void setCan(Boolean value) {
this.can = value;
}
}
当我在arraylist中添加大约60,000个旅程类对象时。它给出了java.lang.outofmemory错误，并且我将最大大小增加到1GB的堆大小。对于大型元素，是否有除ArrayList之外的任何其他选项。
答案 0 :(得分：0)
这样ArrayList可能不是问题;当你添加比当前数组可以包含的更多的元素时，ArrayList分配两倍数组大小更可能会破坏，即当元素的内部数组已满时，它将使数组加倍并复制所有内容。因此，在短时间内，它将需要size()*3倍的内存（实际数字略有不同，但你明白了）。
您可以使用其他列表，但它们需要更多内存，但需要更小的内存。
上述错误还取决于每个Journey对象的大小。 60K对象并不多，但如果每个对象都是10KB，则需要600 MB或60GB的Java VM。
解决方法：
不要将整个对象保留在RAM中，而是记住文件中的开始和结束位置。这只需几个字节。当有人请求对象时，使用RandomFileAccess只读取单行程的XML并解析它。
不是将所有对象都保存在内存中，而是将数据放入数据库中。