本篇内容介绍了“Java数据结构图的领接矩阵举例分析”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
1.图的领接矩阵(Adjacency Matrix)存储结构
图的领接矩阵(Adjacency Matrix)存储方式是用两个数组来表示图。一个一位数组存储图中顶点信息,一个二维数组(称为领接矩阵)存储图中的边或弧的信息。
举例
无向图
无向图的领接矩阵的第i行或第i列的非零元素个数正好是第i个顶点的度。
有向图
有向图的领接矩阵的第i行的非零元素个数正好是第i个顶点的出度,第i列的非零元素个数正好是第i个顶点的入度。
带权值的网图
2.图的接口类
3.图的类型,用枚举类表示
public enum GraphKind { UDG,DG,UDN,DN;//无向图、有向图、无向网、有向网 }
4.图的领接矩阵描述
对于一个具有n个顶点的图G,可以将图G的领接矩阵存储在一个二维数组中.
package Graph; /* 图的领接矩阵描述类 */ import java.util.Scanner; public class MyGraph implements IGraph { public final static int INFINITY = Integer.MAX_VALUE; private GraphKind kind; //图的标志 private int vexNum, arcNum; //图当前顶点和边数 private Object[] vexs; //顶点 private int[][] arcs; //邻接矩阵 public MyGraph() { //空参构造 this(null, 0, 0, null, null); } public MyGraph(GraphKind kind, int vexNum, int arcNum, Object[] vexs, int[][] arcs) { // 实参构造 this.kind = kind; this.vexNum = vexNum; this.arcNum = arcNum; this.vexs = vexs; this.arcs = arcs; } @Override public void createGraph() { //创建新图 Scanner sc = new Scanner(System.in); System.out.println("请输入图的类型:"); GraphKind kind = GraphKind.valueOf(sc.next()); switch (kind) { case UDG: createUDG(); return; case DG: createDG(); return; case UDN: createUDG(); return; case DN: createDN(); return; } } private void createUDG() { //创建无向图 Scanner sc = new Scanner(System.in); System.out.println("请输入图的顶点数、图的边数:"); vexNum = sc.nextInt(); arcNum = sc.nextInt(); vexs = new Object[vexNum]; System.out.println("请分别输入图的各个顶点"); for (int v = 0; v < vexNum; v++) //构造顶点函数 vexs[v] = sc.next(); arcs = new int[vexNum][vexNum]; for (int v = 0; v < vexNum; v++) for (int u = 0; u < vexNum; u++) arcs[v][u] = INFINITY; //初始化领接矩阵 System.out.println("请输入各个边的两个顶点及其权值:"); for (int k = 0; k < arcNum; k++) { int v = locateVex(sc.next()); int u = locateVex(sc.next()); arcs[v][u] = arcs[v][u] = sc.nextInt(); } } private void createDG() { //创建有向图 } ; private void createUDN() { //创建无向网 } private void createDN() { //创建有向网 Scanner sc = new Scanner(System.in); System.out.println("请输入图的顶点数、图的边数:"); vexNum = sc.nextInt(); arcNum = sc.nextInt(); vexs = new Object[vexNum]; System.out.println("请分别输入图的各个顶点"); for (int v = 0; v < vexNum; v++) //构造顶点函数 vexs[v] = sc.next(); arcs = new int[vexNum][vexNum]; for (int v = 0; v < vexNum; v++) for (int u = 0; u < vexNum; u++) arcs[v][u] = INFINITY; //初始化领接矩阵 System.out.println("请输入各个边的两个顶点及其权值:"); for (int k = 0; k < arcNum; k++) { int v = locateVex(sc.next()); int u = locateVex(sc.next()); arcs[v][u] = sc.nextInt(); } } @Override public int getVexNum() { return vexNum; //返回顶点数 } @Override public int getArcNum() { return arcNum; //返回边数 } @Override //返回v的第一个领接点,若v没有领接点返回-1; public Object getVex(int v) throws Exception { if (v < 0 && v >= vexNum) throw new Exception("第" + v + "个顶点不存在!"); return vexs[v]; <0v<vexNum } @Override public int locateVex(Object vex) { //顶点定位法 for (int v = 0; v < vexNum; v++) if (vexs[v].equals(vex)) return v; return 0; } @Override public int firstAdjVex(int v) throws Exception { //查找第一个领接点 if (v < 0 && v >= vexNum) throw new Exception("第" + v + "个顶点不存在!"); for (int j = 0; j < vexNum; j++) if (arcs[v][j] != 0 && arcs[v][j] < INFINITY) return j; return -1; } @Override public int nextAdjvex(int v, int w) { //查找下一个领接点 return 0; } public GraphKind getKind(){ //返回图标类型 return kind; } public int[][] getArcs() { //返回邻接矩阵的值 return arcs; } //返回顶点 public Object[] getVexs() { return vexs; } }
测试类
public static void main(String[] args) throws Exception { MyGraph M=new MyGraph(); //创建图空间 M.createGraph(); System.out.println("创建无向网的顶点个数为:"+M.getVexNum()); System.out.println("创建无向网的边个数为:"+M.getArcNum()); System.out.println("请输入要查找顶点的值:"); Scanner sc=new Scanner(System.in); Object top=sc.next(); System.out.println("要查找顶点"+top+"的值为:"+ M.locateVex(top)); System.out.println("请输入要查找顶点的索引:"); int x= sc.nextInt(); System.out.println("要查找位置"+x+"处的顶点值为:"+M.getVex(x) ); System.out.println("请输入邻接点的顶点的位置:"); int n= sc.nextInt(); System.out.println("要查找位置"+n+"处的顶点值为:"+M.firstAdjVex(n) ); } }
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原创文章,作者:kepupublish,如若转载,请注明出处:https://blog.ytso.com/tech/dev/230239.html