Handy pretty printer

PrettyPrint.java

package com.dariodario.experiments;

import java.lang.reflect.Field;
import java.lang.reflect.InaccessibleObjectException;
import java.util.Collection;
import java.util.Map;
import org.apache.commons.lang3.reflect.FieldUtils;

/* Pretty printer I created on the fly for testing purposes, it recursively prints an object hierarchy by showing the fields, all of them. Won't handle circular references. Java 17, Commons Lang 3 */

public class PrettyPrint {

  public static String print(Object obj) {
    StringBuilder builder = new StringBuilder();
    String spacing = "";
    innerPrint(obj, spacing, builder, false);
    return builder.toString();
  }

  private static void innerPrint(Object obj, String spacing, StringBuilder builder, boolean keepIndent) {
    if (keepIndent){
      builder.append(spacing + obj.getClass().getSimpleName() + " {\n");
    }else {
      builder.append(obj.getClass().getSimpleName() + " {\n");
    }
    Field[] fields = obj.getClass().getDeclaredFields();
    for (Field field : fields) {
      try {
        Object value = FieldUtils.readField(field, obj, true);
        String fieldString = spacing + "  - " + field.getName();
        String fieldIndent = " ".repeat(fieldString.length());
        builder.append(fieldString + ": ");

        if (field.getType().isEnum()) {
          builder.append(value.toString());
        } else {
          switch (value) {
            case null -> builder.append("null");
            case Boolean b -> builder.append(b);
            case String str -> builder.append("\"" + str + "\"");
            case Integer n -> builder.append(n);
            case Collection list -> {
              builder.append("[\n");
              for (Object item : list) {
                innerPrint(item, "    " + spacing, builder, true);
                builder.append("\n");
              }
              builder.append(spacing + "  " + "]");
            }
            case Map map -> {
              builder.append("{\n");
              for (Object k : map.keySet()) {
                String mapField = k.toString() + ": ";
                String mapFieldIndent = " ".repeat(mapField.length());
                builder.append(fieldIndent + "   " + mapField);
                innerPrint(map.get(k), fieldIndent + mapFieldIndent + "  "  , builder, false);
                builder.append("\n");
              }
              builder.append("      " + spacing + "}");
            }

            default -> {
              if (field.getType().isPrimitive()) {
                builder.append(value.toString());
              }
              innerPrint(value, spacing + "  ", builder, false);
            }
          }
        }
        builder.append("\n");
      } catch (IllegalAccessException e) {
        builder.append(spacing + field.getName() + ": ???\n");
      } catch (InaccessibleObjectException e) {
        builder.append(spacing + field.getName() + ": ???\n");
      }
    }
    if (keepIndent) {
      builder.append(spacing + "}");
    }else{
      int adjust = Math.max(0, spacing.length() - obj.getClass().getSimpleName().length());
      builder.append(spacing + "}");
    }
  }

}