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package class02;
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import java.util.HashMap;
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public class Code03_ReceiveAndPrintOrderLine {
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public static class Node {
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public String info;
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public Node next;
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public Node(String str) {
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info = str;
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}
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}
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public static class MessageBox {
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private HashMap<Integer, Node> headMap;
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private HashMap<Integer, Node> tailMap;
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private int waitPoint;
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public MessageBox() {
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headMap = new HashMap<Integer, Node>();
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tailMap = new HashMap<Integer, Node>();
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waitPoint = 1;
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}
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// 消息的编号，info消息的内容, 消息一定从1开始
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public void receive(int num, String info) {
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if (num < 1) {
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return;
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}
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Node cur = new Node(info);
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// num~num
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headMap.put(num, cur);
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tailMap.put(num, cur);
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// 建立了num~num这个连续区间的头和尾
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// 查询有没有某个连续区间以num-1结尾
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if (tailMap.containsKey(num - 1)) {
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tailMap.get(num - 1).next = cur;
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tailMap.remove(num - 1);
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headMap.remove(num);
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}
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// 查询有没有某个连续区间以num+1开头的
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if (headMap.containsKey(num + 1)) {
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cur.next = headMap.get(num + 1);
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tailMap.remove(num);
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headMap.remove(num + 1);
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}
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if (num == waitPoint) {
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print();
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}
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}
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private void print() {
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Node node = headMap.get(waitPoint);
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headMap.remove(waitPoint);
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while (node != null) {
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System.out.print(node.info + " ");
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node = node.next;
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waitPoint++;
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}
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tailMap.remove(waitPoint-1);
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System.out.println();
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}
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}
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public static void main(String[] args) {
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// MessageBox only receive 1~N
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MessageBox box = new MessageBox();
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// 1....
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System.out.println("这是2来到的时候");
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box.receive(2,"B"); // - 2"
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System.out.println("这是1来到的时候");
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box.receive(1,"A"); // 1 2 -> print, trigger is 1
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box.receive(4,"D"); // - 4
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box.receive(5,"E"); // - 4 5
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box.receive(7,"G"); // - 4 5 - 7
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box.receive(8,"H"); // - 4 5 - 7 8
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box.receive(6,"F"); // - 4 5 6 7 8
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box.receive(3,"C"); // 3 4 5 6 7 8 -> print, trigger is 3
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box.receive(9,"I"); // 9 -> print, trigger is 9
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box.receive(10,"J"); // 10 -> print, trigger is 10
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box.receive(12,"L"); // - 12
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box.receive(13,"M"); // - 12 13
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box.receive(11,"K"); // 11 12 13 -> print, trigger is 11
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}
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}
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