java实现深度优先搜索

广度优先搜索遍历
package com.lishilin;

import com.sun.istack.internal.NotNull;

import java.util.*;

public class Dfs {

public static class Node implements Comparable<Node> {

    private String name;

    private TreeSet<Node> set = new TreeSet<>();//有序的集合

    public Node() {
    }

    public Node(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Set<Node> getSet() {
        return set;
    }

    public void setSet(TreeSet<Node> set) {
        this.set = set;
    }

    @Override
    public int compareTo(@NotNull Node o) {//排序规则
        if(name.hashCode()>o.getName().hashCode())
            return 1;
        return 0;
    }
}

public Node init() {//初始化一个图
    Node nodeA = new Node("A");
    Node nodeB = new Node("B");
    Node nodeC = new Node("C");
    Node nodeD = new Node("D");
    Node nodeE = new Node("E");
    Node nodeF = new Node("F");
    Node nodeG = new Node("G");
    Node nodeH = new Node("H");
    nodeA.getSet().add(nodeB);
    nodeA.getSet().add(nodeC);
    nodeB.getSet().add(nodeD);
    nodeB.getSet().add(nodeE);
    nodeC.getSet().add(nodeF);
    nodeC.getSet().add(nodeG);
    nodeD.getSet().add(nodeH);
    nodeE.getSet().add(nodeH);
    return nodeA;
}

public void visite(Node node) {//访问每个节点

    System.out.println(node.getName());

}

private Set<Node> open = new HashSet<>();

private Stack<Node> stack = new Stack<>();

public void dfs(Node begin) {

    if(begin != null) {
        stack.push(begin);//使用一个栈
        open.add(begin);//标记已经访问过了
        dfsLoop();
    }


}

public void dfsLoop() {

    Node peek = stack.pop();
    visite(peek);
    Set<Node> set = peek.getSet();//获取与当前节点直接关联的所有节点
    for (Node node : set) {
        if (!open.contains(node)) {//没有访问过
            stack.push(node);
            open.add(node);
            dfsLoop();
        }
    }
}

public static void main(String[] args) {
    Dfs dfs = new Dfs();
    dfs.dfs(dfs.init());
}

}

来源：https://blog.csdn.net/qq_41738049/article/details/100065942

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深度优先搜索