吹牛：我写的JSONParser可能是这个星球上最快了（Java）

try {
	// ...
} catch (StackOverflowError e) {
	throw new JSONException("maybe circular references", e);
}

public final class JSONSerializerContext {
	public static final int DEFAULT_TABLE_SIZE = 64;

	private final Entry[] buckets;
	private final int indexMask;

	public JSONSerializerContext() {
		this(DEFAULT_TABLE_SIZE);
	}

	public JSONSerializerContext(int tableSize) {
		this.indexMask = tableSize - 1;
		this.buckets = new Entry[tableSize];
	}

	// 添加引用，如果存在则返回true，否则返回false
	public final boolean put(Object obj) { 
		final int hash = System.identityHashCode(obj);
		final int bucket = hash & indexMask;

		for (Entry entry = buckets[bucket]; entry != null; entry = entry.next) {
			if (obj == entry.object) {
				return true;
			}
		}

		Entry entry = new Entry(obj, hash, buckets[bucket]);
		buckets[bucket] = entry;

		return false;
	}

	protected static final class Entry {
		public final int hashCode;
		public final Object object;

		public Entry next;

		public Entry(Object object, int hash, Entry next) {
			this.object = object;
			this.next = next;
			this.hashCode = hash;
		}
	}
}

import com.alibaba.fastjson.annotation.JSONField;

public class Category {
	private Category parent;
	private List<Category> children = new ArrayList<Category>();

	@JSONField(serialize=false) // 标识不需要序列化
	public Category getParent() {
		return parent;
	}

	public void setParent(Category parent) {
		this.parent = parent;
	}

	public List<Category> getChildren() {
		return children;
	}

	public void setChildren(List<Category> children) {
		this.children = children;
	}
}