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JonCookjcook02
JonCook
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jcook02
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BAEL-7944 - Sort JSON Object in Java (eugenp#17091)
* BAEL-7864 - How to convert org.w3c.dom.Document to String in Java * BAEL-7944 - Sort JSON Object in Java --------- Co-authored-by: jcook02 <jonathan.paul.cook@ext.esa.int>
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‎json-modules/json-operations/README.md

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## Relevant Articles
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‎json-modules/json-operations/pom.xml

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<?xml version="1.0" encoding="UTF-8" ?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.baeldung</groupId>
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<artifactId>json-operations</artifactId>
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<name>json-operations</name>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>json-modules</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>com.google.code.gson</groupId>
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<artifactId>gson</artifactId>
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<version>${gson.version}</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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</dependencies>
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<properties>
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<gson.version>2.11.0</gson.version>
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</properties>
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</project>

‎json-modules/json-operations/src/main/java/com/baeldung/sorting/SolarEvent.java

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package com.baeldung.sorting;
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import com.fasterxml.jackson.annotation.JsonProperty;
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class SolarEvent {
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@JsonProperty("event_name")
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private String eventName;
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@JsonProperty("date")
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private String date;
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@JsonProperty("coordinates")
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private Coordinates coordinates;
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@JsonProperty("type")
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private String type;
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@JsonProperty("class")
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private String eventClass;
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@JsonProperty("size")
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private String size;
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@JsonProperty("speed_km_per_s")
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private int speedKmPerS;
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public String getEventName() {
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return eventName;
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}
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public void setEventName(String eventName) {
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this.eventName = eventName;
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}
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public String getDate() {
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return date;
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}
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public void setDate(String date) {
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this.date = date;
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}
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public Coordinates getCoordinates() {
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return coordinates;
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}
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public void setCoordinates(Coordinates coordinates) {
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this.coordinates = coordinates;
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}
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public String getType() {
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return type;
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}
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public void setType(String type) {
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this.type = type;
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}
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public String getEventClass() {
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return eventClass;
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}
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public void setEventClass(String eventClass) {
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this.eventClass = eventClass;
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}
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public String getSize() {
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return size;
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}
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public void setSize(String size) {
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this.size = size;
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}
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public int getSpeedKmPerS() {
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return speedKmPerS;
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}
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public void setSpeedKmPerS(int speedKmPerS) {
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this.speedKmPerS = speedKmPerS;
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}
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}
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class Coordinates {
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@JsonProperty("latitude")
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private double latitude;
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@JsonProperty("longitude")
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private double longitude;
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public double getLatitude() {
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return latitude;
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}
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public void setLatitude(double latitude) {
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this.latitude = latitude;
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}
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public double getLongitude() {
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return longitude;
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}
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public void setLongitude(double longitude) {
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this.longitude = longitude;
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}
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}

‎json-modules/json-operations/src/main/java/com/baeldung/sorting/SolarEventContainer.java

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package com.baeldung.sorting;
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import java.util.List;
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import com.fasterxml.jackson.annotation.JsonProperty;
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public class SolarEventContainer {
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@JsonProperty("solar_events")
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private List<SolarEvent> solarEvents;
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// Getters and setters
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public List<SolarEvent> getSolarEvents() {
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return solarEvents;
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}
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public void setSolarEvents(List<SolarEvent> solarEvents) {
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this.solarEvents = solarEvents;
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}
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}

‎json-modules/json-operations/src/test/java/com/baeldung/sorting/JsonObjectSortingUnitTest.java

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package com.baeldung.sorting;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileReader;
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import java.io.IOException;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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import org.junit.jupiter.api.Test;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.google.gson.JsonArray;
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import com.google.gson.JsonElement;
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import com.google.gson.JsonParser;
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import com.google.gson.stream.JsonReader;
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class JsonObjectSortingUnitTest {
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@Test
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void givenJsonObject_whenUsingJackson_thenSortedBySpeedCorrectly() throws IOException {
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ObjectMapper objectMapper = new ObjectMapper();
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SolarEventContainer container = objectMapper.readValue(
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new File("src/test/resources/solar_events.json"), SolarEventContainer.class);
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List<SolarEvent> events = container.getSolarEvents();
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Collections.sort(events, Comparator.comparingInt(event -> event.getSpeedKmPerS()));
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assertEquals(100, events.get(0)
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.getSpeedKmPerS());
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assertEquals(500, events.get(1)
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.getSpeedKmPerS());
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assertEquals(1000, events.get(2)
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.getSpeedKmPerS());
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assertEquals(1500, events.get(3)
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.getSpeedKmPerS());
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}
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@Test
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public void givenJsonObject_whenUsingGson_thenSortedBySizeCorrectly() throws FileNotFoundException {
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JsonReader reader = new JsonReader(new FileReader("src/test/resources/solar_events.json"));
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JsonElement element = JsonParser.parseReader(reader);
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JsonArray events = element.getAsJsonObject().getAsJsonArray("solar_events");
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List<JsonElement> list = events.asList();
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Collections.sort(list, (a, b) -> {
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double latA = a.getAsJsonObject()
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.getAsJsonObject("coordinates")
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.get("latitude")
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.getAsDouble();
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double latB = b.getAsJsonObject()
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.getAsJsonObject("coordinates")
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.get("latitude")
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.getAsDouble();
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return Double.compare(latA, latB);
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});
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assertEquals(-5, getJsonAttributeAsInt(list.get(0)));
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assertEquals(0, getJsonAttributeAsInt(list.get(1)));
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assertEquals(15, getJsonAttributeAsInt(list.get(2)));
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assertEquals(37, getJsonAttributeAsInt(list.get(3)));
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}
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private int getJsonAttributeAsInt(JsonElement element) {
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return element.getAsJsonObject()
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.getAsJsonObject("coordinates")
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.get("latitude")
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.getAsInt();
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}
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}

‎json-modules/json-operations/src/test/resources/solar_events.json

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{
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"solar_events": [
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{
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"event_name": "Solar Eclipse",
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"date": "2024-04-08",
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"coordinates": {
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"latitude": 37.7749,
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"longitude": -122.4194
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},
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"size": "Large",
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"speed_km_per_s": 1000
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},
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{
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"event_name": "Solar Flare",
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"date": "2023-10-28",
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"coordinates": {
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"latitude": 0,
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"longitude": 0
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},
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"size": "Small",
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"speed_km_per_s": 100
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},
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{
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"event_name": "Sunspot",
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"date": "2023-11-15",
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"coordinates": {
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"latitude": 15,
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"longitude": -75
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},
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"size": "Large",
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"speed_km_per_s": 1500
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},
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{
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"event_name": "Coronal Mass Ejection",
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"date": "2024-01-10",
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"coordinates": {
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"latitude": -5,
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"longitude": 80
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},
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"size": "Medium",
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"speed_km_per_s": 500
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}
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]
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}

‎json-modules/pom.xml

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<module>json-2</module>
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<module>json-arrays</module>
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<module>json-conversion</module>
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<module>json-operations</module>
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<module>json-path</module>
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<module>gson</module>
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<module>gson-2</module>
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<json.version>20240303</json.version>
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</properties>
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</project>
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</project>

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