public class ZooKeeper {
    ...

    // Execute multiple operations atomically.
    public List<OpResult> multi (Iterable<Op> ops) { ... }
    public void multi (Iterable<Op> ops, MultiCallback cb, Object ctx) { ... }

    ...
}

public abstract class Op {
    private int type;
    private String path;

    private Op (int type, String path) {
        this.type = type;
        this.path = path;
    }

    public static Op create (String path, byte [] data, List<ACL> acl, int flags) {
        return new Create (path, data, acl, flags);
    }

    public static class Create extends Op {
        private byte [] data;
        private List<ACL> acl;
        private int flags;

        private Create (String path, byte [] data, List<ACL> acl, int flags) {
            super (ZooDefs.OpCode.create, path);
            this.data = data;
            this.acl = acl;
            this.flags = flags;
        }

        ...
    }

    ...
}


public abstract class OpResult {
    private int type;

    private OpResult (int type) {
        this.type = type;
    }

    public static class CreateResult extends OpResult {
        private String path;

        public CreateResult (String path) {
            super (ZooDefs.OpCode.create);
            this.path = path;
        }

        ...
    }

    ...
}