路由选择矢量距离java

根据提供的引用内容，以下是一个使用Java实现的距离向量路由选择算法的示例：

import java.util.HashMap;
import java.util.Map;

public class DistanceVectorRouting {
    private static final int INFINITY = 9999;

    public static void main(String[] args) {
        // 创建路由表
        Map<String, Map<String, Integer>> routingTable = new HashMap<>();
        Map<String, Integer> routerA = new HashMap<>();
        Map<String, Integer> routerB = new HashMap<>();
        Map<String, Integer> routerC = new HashMap<>();
        Map<String, Integer> routerD = new HashMap<>();
        Map<String, Integer> routerE = new HashMap<>();

        // 初始化路由表
        routerA.put("A", 0);
        routerA.put("B", 1);
        routerA.put("C", INFINITY);
        routerA.put("D", INFINITY);
        routerA.put("E", INFINITY);

        routerB.put("A", 1);
        routerB.put("B", 0);
        routerB.put("C", );
        routerB.put("D", INFINITY);
        routerB.put("E", INFINITY);

        routerC.put("A", INFINITY);
        routerC.put("B", 2);
        routerC.put("C", 0);
        routerC.put("D", 3);
        routerC.put("E", INFINITY);

        routerD.put("A", INFINITY);
        routerD.put("B", INFINITY);
        routerD.put("C", 3);
        routerD.put("D", 0);
        routerD.put("E", 4);

        routerE.put("A", INFINITY);
        routerE.put("B", INFINITY);
        routerE.put("C", INFINITY);
        routerE.put("D", 4);
        routerE.put("E", 0);

        routingTable.put("A", routerA);
        routingTable.put("B", routerB);
        routingTable.put("C", routerC);
        routingTable.put("D", routerD);
        routingTable.put("E", routerE);

        // 打印初始路由表
        System.out.println("初始路由表：");
        printRoutingTable(routingTable);

        // 更新路由表
        updateRoutingTable(routingTable);

        // 打印更新后的路由表
        System.out.println("更新后的路由表：");
        printRoutingTable(routingTable);
    }

    private static void updateRoutingTable(Map<String, Map<String, Integer>> routingTable) {
        boolean updated;
        do {
            updated = false;
            for (String router : routingTable.keySet()) {
                Map<String, Integer> currentRouter = routingTable.get(router);
                for (String neighbor : currentRouter.keySet()) {
                    if (!neighbor.equals(router) && currentRouter.get(neighbor) != INFINITY) {
                        Map<String, Integer> neighborRouter = routingTable.get(neighbor);
                        for (String destination : neighborRouter.keySet()) {
                            int distance = currentRouter.get(neighbor) + neighborRouter.get(destination);
                            if (distance < currentRouter.get(destination)) {
                                currentRouter.put(destination, distance);
                                updated = true;
                            }
                        }
                    }
                }
            }
        } while (updated);
    }

    private static void printRoutingTable(Map<String, Map<String, Integer>> routingTable) {
        for (String router : routingTable.keySet()) {
            System.out.println(router + ": " + routingTable.get(router));
        }
        System.out.println();
    }
}