java - JsonArray loop using Streams

Java - JsonArray loop using Streams

In Java, you can loop through a JsonArray using streams and lambda expressions from the Java Stream API. Here's how you can do it:

Suppose you have a JsonArray named jsonArray. Below is an example of how you can iterate through it using streams:

import javax.json.Json; import javax.json.JsonArray; import javax.json.JsonObject; public class Main { public static void main(String[] args) { JsonArray jsonArray = Json.createArrayBuilder() .add(Json.createObjectBuilder().add("name", "John").add("age", 30).build()) .add(Json.createObjectBuilder().add("name", "Alice").add("age", 25).build()) .build(); // Iterate through the JsonArray using streams jsonArray.forEach(jsonValue -> { JsonObject jsonObject = (JsonObject) jsonValue; String name = jsonObject.getString("name"); int age = jsonObject.getInt("age"); System.out.println("Name: " + name + ", Age: " + age); }); } }

In this example:

  • We have a JsonArray containing two JsonObjects, each representing a person's name and age.
  • We use the forEach() method of JsonArray to iterate over each element.
  • Within the lambda expression, we cast each JsonValue to a JsonObject.
  • We extract the values of "name" and "age" from each JsonObject using getString() and getInt() methods, respectively, and print them out.

This way, you can loop through a JsonArray using streams in Java.

Examples

  1. Java loop through JsonArray using Streams

    • Description: Explains how to iterate over a JsonArray using Java Streams, providing a concise and functional approach.
    // Iterate through JsonArray using Streams JsonArray jsonArray = ...; // Your JsonArray jsonArray.stream().forEach(jsonElement -> { // Perform operations on each JsonElement });

  2. Java JsonArray loop with Streams filter

    • Description: Demonstrates how to loop through a JsonArray using Streams with filtering capabilities.
    // Loop through JsonArray with filtering using Streams JsonArray jsonArray = ...; // Your JsonArray jsonArray.stream() .filter(jsonElement -> jsonElement.isJsonObject()) // Example filter condition .forEach(jsonElement -> { // Perform operations on filtered JsonElements });

  3. Java JsonArray loop with Streams map

    • Description: Illustrates looping through a JsonArray using Streams with mapping functionality.
    // Loop through JsonArray with mapping using Streams JsonArray jsonArray = ...; // Your JsonArray List<String> resultList = jsonArray.stream() .map(jsonElement -> jsonElement.getAsString()) // Example mapping operation .collect(Collectors.toList());

  4. Java loop JsonArray with Streams collect

    • Description: Shows how to loop through a JsonArray using Streams and collect the results.
    // Loop through JsonArray with collection using Streams JsonArray jsonArray = ...; // Your JsonArray List<JsonObject> resultList = jsonArray.stream() .filter(jsonElement -> jsonElement.isJsonObject()) // Example filter condition .map(JsonElement::getAsJsonObject) .collect(Collectors.toList());

  5. Java iterate JsonArray using Streams forEachOrdered

    • Description: Explains how to iterate over a JsonArray using Streams in a specified order using forEachOrdered.
    // Iterate JsonArray using forEachOrdered in Streams JsonArray jsonArray = ...; // Your JsonArray jsonArray.stream().forEachOrdered(jsonElement -> { // Perform ordered operations on each JsonElement });

  6. Java loop through JsonArray with Streams and forEach

    • Description: Provides a simple example of looping through a JsonArray using Streams and forEach.
    // Loop through JsonArray with forEach using Streams JsonArray jsonArray = ...; // Your JsonArray jsonArray.forEach(jsonElement -> { // Perform operations on each JsonElement });

  7. Java JsonArray loop with Streams and parallel

    • Description: Demonstrates how to loop through a JsonArray using Streams in parallel for improved performance.
    // Loop through JsonArray in parallel using Streams JsonArray jsonArray = ...; // Your JsonArray jsonArray.parallelStream().forEach(jsonElement -> { // Perform parallel operations on each JsonElement });

  8. Java loop JsonArray with Streams and findFirst

    • Description: Illustrates how to loop through a JsonArray using Streams and find the first matching element.
    // Loop through JsonArray with finding first element using Streams JsonArray jsonArray = ...; // Your JsonArray Optional<JsonElement> result = jsonArray.stream() .filter(jsonElement -> jsonElement.isJsonObject()) // Example filter condition .findFirst();

  9. Java loop through JsonArray using Streams and forEachRemaining

    • Description: Explains how to iterate over a JsonArray using Streams and forEachRemaining for efficient traversal.
    // Iterate JsonArray using forEachRemaining in Streams JsonArray jsonArray = ...; // Your JsonArray Iterator<JsonElement> iterator = jsonArray.iterator(); iterator.forEachRemaining(jsonElement -> { // Perform operations on each JsonElement });

  10. Java loop JsonArray with Streams and toArray

    • Description: Shows how to loop through a JsonArray using Streams and convert it to an array.
    // Loop through JsonArray with converting to array using Streams JsonArray jsonArray = ...; // Your JsonArray JsonElement[] array = jsonArray.stream().toArray(JsonElement[]::new);

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