package com.FeeLang; import java.util.Scanner; class ArcNode{ int adjvex; ArcNode next; } class VertexNode{ char vertex; ArcNode firstedge; } public class Graph { public static void main(String[] args){ int n = 3; int e = 3; char[] vertexs = new char[n]; vertexs[0] = ‘A’; vertexs[1] = ‘B’; vertexs[2] = ‘C’; Graph ALGraph = new Graph(vertexs, n, e); ALGraph.DFS(); } public Graph(char[] vertexs, int node, int edge){ this.node = node; this.edge = edge; adjlist = new VertexNode[this.node]; visited = new boolean[this.node]; for (int i = 0; i < this.node; i++){ adjlist[i] = new VertexNode(); adjlist[i].vertex = vertexs[i]; adjlist[i].firstedge = null; } Scanner sc = new Scanner(System.in); for (int i = 0; i < this.edge; i++){ int v, u; v = sc.nextInt(); u = sc.nextInt(); if (v >= this.node || u >= this.node){ System.out.println(“Wrong input”); i–; continue; } //为节省内存采用前插法 ArcNode s = new ArcNode(); s.adjvex = u; s.next = adjlist[v].firstedge; adjlist[v].firstedge = s; } } //output: visited[u] is set to true for all nodes u reachable from v public void explore(int v){ visited[v] = true; System.out.println(v); ArcNode an = adjlist[v].firstedge; while (an != null){ if (!visited[v]){ explore(an.adjvex); } an = an.next; } } public void DFS(){ for (int i = 0; i < this.node; i++){ if (!visited[i]){ explore(i); } } } private VertexNode[] adjlist; private boolean[] visited; private int node; private int edge; }
注意:Line28 and Line31,java数组的空间分配问题。
算法参考:《算法分析与设计》