1. import org.json.JSONArray;
  2. import org.json.JSONObject;
  3. import java.util.ArrayList;
  4. import java.util.List;
  6. public class JsonProcessor {
  8. public static List<String> processJson(String jsonString) {
  9. List<String> results = new ArrayList<>();
  11. try {
  12. JSONObject jsonObject = new JSONObject(jsonString);
  14. // Example: Accessing nested data with error handling
  15. String name = (String) jsonObject.get("person", "name"); // Default to "name" if "person" is missing
  16. if (name != null) {
  17. results.add("Name: " + name);
  18. } else {
  19. results.add("Name: Not found");
  20. }
  22. JSONObject personDetails = jsonObject.getJSONObject("person");
  23. String age = (String) personDetails.get("age"); //Default value if missing
  24. if (age != null) {
  25. results.add("Age: " + age);
  26. } else {
  27. results.add("Age: Not found");
  28. }
  31. // Example: Handling array of objects
  32. JSONArray items = jsonObject.getJSONArray("items");
  33. if (items != null) {
  34. for (int i = 0; i < items.length(); i++) {
  35. JSONObject item = items.getJSONObject(i);
  36. String itemName = item.getString("name");
  37. if (itemName != null) {
  38. results.add("Item " + (i + 1) + ": " + itemName);
  39. } else {
  40. results.add("Item " + (i + 1) + ": Name not found");
  41. }
  42. }
  43. } else {
  44. results.add("Items: Not found");
  45. }
  47. } catch (Exception e) {
  48. // Graceful failure handling
  49. System.err.println("Error processing JSON: " + e.getMessage());
  50. results.add("Error: JSON processing failed - " + e.getMessage());
  51. }
  53. return results;
  54. }
  56. public static void main(String[] args) {
  57. String json = "{\"person\": {\"name\": \"Alice\", \"age\": \"30\"}, \"items\": [{\"name\": \"Apple\"}, {\"name\": \"Banana\"}]}";
  58. List<String> output = processJson(json);
  59. for (String line : output) {
  60. System.out.println(line);
  61. }
  63. // Example with missing data and invalid JSON
  64. String json2 = "{\"person\": {\"age\": \"30\"}, \"items\": [{\"name\": \"Apple\"}, ]}"; //Missing name in last item
  65. List<String> output2 = processJson(json2);
  66. for (String line : output2) {
  67. System.out.println(line);
  68. }
  70. String invalidJson = "{\"person\": {\"name\": \"Alice\", \"age\": \"30\""; //invalid JSON
  71. List<String> output3 = processJson(invalidJson);
  72. for (String line : output3) {
  73. System.out.println(line);
  74. }
  75. }
  76. }

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