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 public void getState(OutputStream output) throws Exception {
        List<ChatAction> actionList = new ArrayList<ChatAction>();
 
        synchronized(state) {
            for (Map.Entry<String, Set<String>> entry : state.entrySet()) {
                String channelName = entry.getKey();
                Set<String> set = entry.getValue();
                for (String nickname : set) {
                    actionList.add(
                            ChatAction.newBuilder()
                                    .setAction(ChatAction.ActionType.JOIN)
                                    .setChannel(channelName)
                                    .setNickname(nickname)
                                    .build()
                    );
                }
            }
        }
 
        ChatState chatState = ChatState.newBuilder().addAllState(actionList).build();
        Util.objectToStream(chatState, new DataOutputStream(output));
    }
 
    public void setState(InputStream input) throws Exception {
        ChatState chatState;
        chatState = (ChatState) Util.objectFromStream(new DataInputStream(input));
        List<ChatAction> chatActions = chatState.getStateList();
 
        synchronized(state) {
            state.clear();
            for (ChatAction chatAction : chatActions) {
                String channelName = chatAction.getChannel();
                String nickname = chatAction.getNickname();
                if (!state.containsKey(channelName)) {
                    state.put(channelName, new TreeSet<String>());
                }
                state.get(channelName).add(nickname);
            }
        }
 
    }

Main.java:1: error: class, interface, or enum expected
 public void getState(OutputStream output) throws Exception {
        ^
Main.java:4: error: class, interface, or enum expected
        synchronized(state) {
                    ^
Main.java:7: error: class, interface, or enum expected
                Set<String> set = entry.getValue();
                ^
Main.java:8: error: class, interface, or enum expected
                for (String nickname : set) {
                ^
Main.java:16: error: class, interface, or enum expected
                }
                ^
Main.java:21: error: class, interface, or enum expected
        Util.objectToStream(chatState, new DataOutputStream(output));
        ^
Main.java:22: error: class, interface, or enum expected
    }
    ^
Main.java:24: error: class, interface, or enum expected
    public void setState(InputStream input) throws Exception {
           ^
Main.java:26: error: class, interface, or enum expected
        chatState = (ChatState) Util.objectFromStream(new DataInputStream(input));
        ^
Main.java:27: error: class, interface, or enum expected
        List<ChatAction> chatActions = chatState.getStateList();
        ^
Main.java:29: error: class, interface, or enum expected
        synchronized(state) {
                    ^
Main.java:31: error: class, interface, or enum expected
            for (ChatAction chatAction : chatActions) {
            ^
Main.java:33: error: class, interface, or enum expected
                String nickname = chatAction.getNickname();
                ^
Main.java:34: error: class, interface, or enum expected
                if (!state.containsKey(channelName)) {
                ^
Main.java:36: error: class, interface, or enum expected
                }
                ^
Main.java:38: error: class, interface, or enum expected
            }
            ^
16 errors

Standard output is empty