Java语言基于无向有权图实现克鲁斯卡尔算法代码示例

package kruskal;
public class Graph {
	final int max=100;
	/*
	 * 顶点节点
	 */
	public class VexNode{
		int adjvex;
		int data;
	}
	VexNode[] vexNodes;
	int[] thevexs;
	//顶点集合
	int[][] edges = new int[max][max];
	//边集合
	/*
	 * 创建图
	 */
	public void createGraph(Graph graph,int[][] A,int[] vexs) {
		thevexs=vexs;
		for (int i = 0; i < vexs.length; i++) {
			for (int j = 0; j < vexs.length; j++) {
				graph.edges[i][j] = A[i][j];
			}
		}
	}
	/*
	 * 输出图
	 */
	public void printGraph(Graph graph) {
		for (int i = 0; i < graph.thevexs.length; i++) {
			for (int j = 0; j < graph.thevexs.length; j++) {
				//没有路径则输出/
				if (graph.edges[i][j]==-1) {
					System.out.printf("%4s","/");
				} else {
					System.out.printf("%4d",graph.edges[i][j]);
				}
			}
			System.out.println("\n");
		}
	}
}

package kruskal;
public class KruSkal {
	public class Edge{
		int start;
		int end;
		int weight;
	}
	public void SortEdge(Edge[] E,int e) {
		Edge temp;
		int j;
		for (int i = 0; i < e; i++) {
			temp=E[i];
			j=i-1;
			while (j>=0&&temp.weight<E[j].weight) {
				E[j+1] = E[j];
				j--;
			}
			E[j+1] = temp;
		}
	}
	public KruSkal(Graph graph) {
		int i,j,u1,v1,sn1,sn2,k;
		int[] vset = new int[100];
		Edge[] E = new Edge[100];
		k=0;
		for (i=0;i<graph.thevexs.length;i++) {
			for (j=0;j<=i;j++) {
				E[k] = new Edge();
				if (graph.edges[i][j]>0) {
					E[k].start=i;
					E[k].end=j;
					E[k].weight=graph.edges[i][j];
					k++;
				}
			}
		}
		SortEdge(E, k);
		for (i=0;i<graph.thevexs.length;i++) {
			vset[i]=i;
		}
		k=1;
		j=0;
		while (k<graph.thevexs.length) {
			u1=E[j].start;
			v1=E[j].end;
			sn1=vset[u1];
			sn2=vset[v1];
			if (sn1!=sn2) {
				System.out.printf("(%d,%d),权值：%d",u1,v1,E[j].weight);
				System.out.println("\n");
				k++;
				for (i=0;i<graph.thevexs.length;i++) {
					if (vset[i]==sn2) {
						vset[i]=sn1;
					}
				}
			}
			j++;
		}
	}
}

package kruskal;
public class Test {
	public static void main(String[] args) {
		int[] vexs = {0,1,2,3,4};
		int[][] A = {
						{0,1,3,4,7},
						{1,0,2,-1,-1},
						{3,2,0,5,8},
						{4,-1,5,0,6},
						{7,-1,8,6,0}
				};
		Graph graph = new Graph();
		graph.createGraph(graph, A, vexs);
		graph.printGraph(graph);
		KruSkal kruSkal = new KruSkal(graph);
	}
}