LeetCode 2633: Convert Object to JSON String Solution

Master LeetCode problem 2633 (Convert Object to JSON String), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2633. Convert Object to JSON String

Medium

Problem Explanation

Explanation:

To convert an object to a JSON string, we can recursively traverse the object's fields and build the JSON string accordingly. We can handle primitive types directly and for objects or arrays, we can recursively call the function to convert them. We need to handle different types of objects such as arrays, primitive types, nested objects, etc.

Algorithm:

Create a function that takes an object as input and returns a JSON string.
If the input object is a primitive type, return the object formatted as a string.
If the input object is an array, iterate through each element and recursively call the function on each element.
If the input object is a nested object, recursively call the function on each field of the object.
Build the JSON string by concatenating the key-value pairs and handling the appropriate formatting for arrays and objects.

Time Complexity: O(N), where N is the total number of elements in the object. Space Complexity: O(N), for the recursive stack space.

Solution Code

class Solution {
    public String objectToJsonString(Object obj) {
        if (obj == null) {
            return "null";
        }
        if (obj instanceof Number || obj instanceof Boolean) {
            return obj.toString();
        }
        if (obj instanceof String) {
            return "\"" + obj.toString() + "\"";
        }
        if (obj instanceof Collection) {
            StringBuilder sb = new StringBuilder();
            sb.append("[");
            boolean first = true;
            for (Object elem : (Collection) obj) {
                if (!first) {
                    sb.append(",");
                }
                sb.append(objectToJsonString(elem));
                first = false;
            }
            sb.append("]");
            return sb.toString();
        }
        if (obj instanceof Map) {
            StringBuilder sb = new StringBuilder();
            sb.append("{");
            boolean first = true;
            for (Map.Entry entry : ((Map<?, ?>) obj).entrySet()) {
                if (!first) {
                    sb.append(",");
                }
                sb.append("\"" + entry.getKey() + "\":");
                sb.append(objectToJsonString(entry.getValue()));
                first = false;
            }
            sb.append("}");
            return sb.toString();
        }
        // Handle custom object types here if needed
        return null;
    }
}

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