我有建议说将元素存储在 arraylist 中然后进行比较，我也听到有人建议使用 HashMap。但是，我对 Java 非常陌生，我不知道什么是 arraylist，什么是 hashmap。有没有好心人来引导我？
我的 json 文件：
{"rel": "IsA", "weight": 0.5, "dataset": "/d/dbpedia/en", "sources": ["/s/dbpedia/3.7"], "id": "914e6775fd79d660bacf22ec699568e6694da3e8", "features": ["america_beautiful IsA -", "america_beautiful - national_anthem", "- IsA national_anthem"], "end": "national_anthem", "license": "/l/CC/By-SA", "uri": "/a/[IsA/,america_beautiful/,national_anthem/]", "start": "america_beautiful", "context": "/ctx/all", "surfaceText": null}
{"rel": "PartOf", "weight": 0.5, "dataset": "/d/dbpedia/en", "sources": ["/s/dbpedia/3.7"], "id": "a2c3ddf6b6237156dbeac84eea2801d35a9562d4", "features": ["ankara PartOf -", "ankara - central_anatolia_region", "- PartOf central_anatolia_region"], "end": "central_anatolia_region", "license": "/l/CC/By-SA", "uri": "/a/[PartOf/,ankara/,central_anatolia_region/]", "start": "ankara", "context": "/ctx/all", "surfaceText": null}
{"rel": "AtLocation", "weight": 0.5, "dataset": "/d/dbpedia/en", "sources": ["/s/dbpedia/3.7"], "id": "ec1914bfb0606c36376fbbcd316e5666022e2469", "features": ["apple_inc AtLocation -", "apple_inc - unite_state", "- AtLocation unite_state"], "end": "unite_state", "license": "/l/CC/By-SA", "uri": "/a/[AtLocation/,apple_inc/,unite_state/]", "start": "apple_inc", "context": "/ctx/all", "surfaceText": null}
{"rel": "AtLocation", "weight": 0.5, "dataset": "/d/dbpedia/en", "sources": ["/s/dbpedia/3.7"], "id": "0209765bf7185615ef242513f61ca0f61efe2a04", "features": ["audi AtLocation -", "audi - curitiba", "- AtLocation curitiba"], "end": "curitiba", "license": "/l/CC/By-SA", "uri": "/a/[AtLocation/,audi/,curitiba/]", "start": "audi", "context": "/ctx/all", "surfaceText": null}
{"rel": "AtLocation", "weight": 0.5, "dataset": "/d/dbpedia/en", "sources": ["/s/dbpedia/3.7"], "id": "5158d1cfce728efb3e42840d166ec06153a3d77d", "features": ["audi AtLocation -", "audi - ingolstadt", "- AtLocation ingolstadt"], "end": "unite_state", "license": "/l/CC/By-SA", "uri": "/a/[AtLocation/,audi/,ingolstadt/]", "start": "audi", "context": "/ctx/all", "surfaceText": null}
我的java文件：
package com.infinitegraph.samples.hellograph;
// Import all InfiniteGraph packages
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import com.infinitegraph.*;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
// Import SLF4J logging packages
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.infinitegraph.BaseVertex;
import java.util.HashMap;
import java.util.ArrayList;
public class HelloGraph
{
public static void main(String[] args)
{
BufferedReader br = null;
JSONParser parser = new JSONParser();
// Set up logging for the HelloGraph class
Logger logger = LoggerFactory.getLogger(HelloGraph.class);
// Create null transaction, null graph database instance
Transaction tx = null;
GraphDatabase helloGraphDB = null;
// Name for graph database and property file
String graphDbName = "HelloGraph";
String propertiesFileName = "HelloGraph.properties";
try
{
try
{
// Delete graph database if it already exists
GraphFactory.delete(graphDbName, propertiesFileName);
}
catch (StorageException sE)
{
logger.info(sE.getMessage());
}
// HINT: Add code to create graph database and its contents
// Create graph database
logger.info("> Creating graph database ...");
GraphFactory.create(graphDbName, propertiesFileName);
// Open graph database
logger.info("> Opening graph database ...");
helloGraphDB = GraphFactory.open(graphDbName, propertiesFileName);
// Begin transaction
logger.info("> Starting a read/write transaction ...");
tx = helloGraphDB.beginTransaction(AccessMode.READ_WRITE);
//create head vertex
HeaderVertex head = new HeaderVertex("JSON File");
helloGraphDB.addVertex(head);
try {
String sCurrentLine;
br = new BufferedReader(new FileReader("C:/Users/ji/Desktop/example.json"));
while ((sCurrentLine = br.readLine()) != null) {
Object obj;
try {
obj = parser.parse(sCurrentLine);
JSONObject jsonObject = (JSONObject) obj;
//code to create vertex
logger.info("> Creating Start vertices ...");
String start = (String) jsonObject.get("start");
StartVertex startV = new StartVertex(start);
helloGraphDB.addVertex(startV);
String end = (String) jsonObject.get("end");
//System.out.println(end);
EndVertex endV = new EndVertex(end);
helloGraphDB.addVertex(endV);
String rel = (String) jsonObject.get("rel");
//System.out.println(rel);
logger.info("> Creating Relationship edge ...");
Relationship relationship1 = new Relationship("");
Relationship relationship2 = new Relationship(rel);
// Connect edges
logger.info("> Connecting vertices ...");
startV.addEdge(relationship1, head, EdgeKind.BIDIRECTIONAL, (short) 0);
endV.addEdge(relationship2, startV, EdgeKind.BIDIRECTIONAL, (short) 0);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (br != null)br.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
// Specify a named root for traversal
logger.info("> Naming a root vertex ...");
helloGraphDB.nameVertex("JSON File", head);
// Commit to save your changes to the graph database
logger.info("> Committing changes ...");
tx.commit();
}
catch (ConfigurationException cE)
{
logger.warn("> Configuration Exception was thrown ... ");
logger.error(cE.getMessage());
}
finally
{
// If the transaction was not committed, complete
// will roll it back
if (tx != null)
tx.complete();
if (helloGraphDB != null)
{
helloGraphDB.close();
logger.info("> On Exit: Closed graph database");
}
}
}
}
// HINT: Add class definitions for Person and Meeting classes here.
class HeaderVertex extends BaseVertex
{
private String header;
public HeaderVertex (String header)
{
setStartName(header);
}
public void setStartName (String header)
{
markModified();
this.header = header;
}
public String toString()
{
fetch();
return this.header;
}
}
class StartVertex extends BaseVertex
{
private String start;
public StartVertex (String start)
{
setStartName(start);
}
public void setStartName (String start)
{
markModified();
this.start = start;
}
public String toString()
{
fetch();
return this.start;
}
}
class EndVertex extends BaseVertex
{
private String end;
public EndVertex (String end)
{
setEndVertex(end);
}
public void setEndVertex (String end)
{
markModified();
this.end = end;
}
public String toString()
{
fetch();
return this.end;
}
}
class Relationship extends BaseEdge
{
private String rel;
public Relationship (String rel)
{
setRelationship(rel);
}
public void setRelationship (String rel)
{
markModified();
this.rel = rel;
}
public String toString()
{
fetch();
return this.rel;
}
}
感谢所有帮助！请帮我这个编码菜鸟！：（ 谢谢！