[JAVA] Format JSON with org.json

Use org.json.JSONObject.toString (int indentFactor).

package hello.json;

import org.json.JSONArray;
import org.json.JSONObject;

public class HelloOrgJson {

	public static void main(String[] args) {
		JSONObject json = new JSONObject();
		json.put("key1", "value1");
		json.put("key2", "value2");

		String[] ss = { "a", "b", "c" };

		JSONArray arr = new JSONArray();
		for (String s : ss) {
			JSONObject o = new JSONObject();
			o.put("xx", s);
		json.put("arr", arr);

		System.err.println("--- no formatting ---");
		System.err.println("--- pretty printed ---");



--- no formatting ---
--- pretty printed ---
 "key1": "value1",
 "arr": [
  {"xx": "a"},
  {"xx": "b"},
  {"xx": "c"}
 "key2": "value2"

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