这是indexloc提供的服务，不要输入任何密码
Skip to content

BAEL-9249 Code and Unit Tests for Extracting Keys from a JSONObject Using keySet() #18501

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 1 commit into from
Closed

BAEL-9249 Code and Unit Tests for Extracting Keys from a JSONObject Using keySet() #18501

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
23 changes: 23 additions & 0 deletions ...ules/json-2/src/main/java/com/baeldung/jsongetvaluewithkeyset/JSONGetValueWithKeySet.java
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
package com.baeldung.jsongetvaluewithkeyset;

import org.json.JSONObject;
import java.util.Set;
import java.util.HashSet;

public class JSONGetValueWithKeySet {
public static Set<String> extractKeys(String jsonString) {
JSONObject jsonObject = new JSONObject(jsonString);
return jsonObject.keySet();
}

public static void extractNestedKeys(JSONObject jsonObject, String parentKey, Set<String> result) {
for (String key : jsonObject.keySet()) {
String fullKey = parentKey.isEmpty() ? key : parentKey + "." + key;
Object value = jsonObject.get(key);
result.add(fullKey);
if (value instanceof JSONObject) {
extractNestedKeys((JSONObject) value, fullKey, result);
}
}
}
}
46 changes: 46 additions & 0 deletions ...n-2/src/test/java/com/baeldung/jsongetvaluewithkeyset/JSONGetValueWithKeySetUnitTest.java
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,46 @@
package com.baeldung.jsongetvaluewithkeyset;

import org.json.JSONObject;

import org.junit.Test;
import java.util.Set;
import java.util.HashSet;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

public class JSONGetValueWithKeySetUnitTest {

@Test
public void testExtractFlatKeys() {
String json = "{\"name\":\"Jane\", \"name_id\":12345, \"city\":\"Vancouver\"}";
Set<String> keys = JSONGetValueWithKeySet.extractKeys(json);
assertTrue(keys.contains("name"));
assertTrue(keys.contains("name_id"));
assertTrue(keys.contains("city"));
assertEquals(3, keys.size());
}

@Test
public void testExtractNestedKeys() {
String json = "{"
+ "\"user\": {"
+ "\"id\": 101,"
+ "\"name\": \"Gregory\""
+ "},"
+ "\"city\": {"
+ "\"id\": 121,"
+ "\"name\": \"Calgary\""
+ "},"
+ "\"region\": \"CA\""
+ "}";

JSONObject jsonObject = new JSONObject(json);
Set<String> actualKeys = new HashSet<>();
JSONGetValueWithKeySet.extractNestedKeys(jsonObject, "", actualKeys);

Set<String> expectedKeys = Set.of("user", "user.id", "user.name", "city",
"city.id", "city.name", "region");
assertEquals(expectedKeys, actualKeys);
}
}