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Commitabfe210

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author
jsquared21
committed
Add Ex_28.02
1 parent5095726 commitabfe210

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11 files changed

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472 Bytes
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importjava.util.*;
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publicabstractclassAbstractGraph<V>implementsGraph<V> {
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protectedList<V>vertices =newArrayList<>();// Store vertices
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protectedList<List<Edge>>neighbors =newArrayList<>();// Adjacendy lists
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/** Construct an empty graph */
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protectedAbstractGraph(){
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}
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/** Construct a graph from vertices and edges stored in arrays */
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protectedAbstractGraph(V[]vertices,int[][]edges) {
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for (inti =0;i <vertices.length;i++)
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addVertex(vertices[i]);
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createAjacencyLists(edges,vertices.length);
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}
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/** Construct a graph from vertices and edges stored in List */
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protectedAbstractGraph(List<V>vertices,List<Edge>edges) {
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for (inti =0;i <vertices.size();i++)
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addVertex(vertices.get(i));
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createAjacencyLists(edges,vertices.size());
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}
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/** Construct a graph for integer vertices 0, 1, 2 and edge list */
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protectedAbstractGraph(List<Edge>edges,intnumberOfVertices) {
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for (inti =0;i <numberOfVertices;i++)
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addVertex((V)(newInteger(i)));// vertices is {0, 1, ...}
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createAjacencyLists(edges,numberOfVertices);
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}
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/** Construct a graph from integer vertices 0, 1, and edge array */
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protectedAbstractGraph(int[][]edges,intnumberOfVertices) {
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for (inti =0;i <numberOfVertices;i++)
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addVertex((V)(newInteger(i)));// vertices is {0, 1, ...}
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createAjacencyLists(edges,numberOfVertices);
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}
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/** Create adjacency lists for each vertex */
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privatevoidcreateAjacencyLists(int[][]edges,intnumberOfVertices) {
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for (inti =0;i <edges.length;i++) {
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addEdge(edges[i][0],edges[i][1]);
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}
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}
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/** Create ajacency lists for each vertex */
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privatevoidcreateAjacencyLists(List<Edge>edges,intnumberOfVertices) {
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for (Edgeedge :edges) {
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addEdge(edge.u,edge.v);
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}
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}
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@Override/** Return the number of vertices in the graph */
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publicintgetSize() {
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returnvertices.size();
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}
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@Override/** Return the vertices in the graph */
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publicList<V>getVertices() {
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returnvertices;
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}
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@Override/** Return the object for the specified vertex */
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publicVgetVertex(intindex) {
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returnvertices.get(index);
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}
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@Override/** Return the index for the specified vertex object */
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publicintgetIndex(Vv) {
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returnvertices.indexOf(v);
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}
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@Override/** Return the neighbors of the specified vertex */
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publicList<Integer>getNeighbors(intvertex) {
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List<Integer>result =newArrayList<>();
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for (Edgee :neighbors.get(vertex)) {
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result.add(e.v);
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}
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returnresult;
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}
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@Override/** REturn the degree for a specified vertex */
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publicintgetDegree(intv) {
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returnneighbors.get(v).size();
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}
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@Override/** Print the edges */
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publicvoidprintEdges() {
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for (intu =0;u <neighbors.size();u++) {
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System.out.print(getVertex(u) +" (" +u +"): ");
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for (Edgee :neighbors.get(u)) {
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System.out.print("(" +getVertex(e.u) +", " +
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getVertex(e.v) +") ");
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}
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System.out.println();
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}
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}
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@Override/** clear the graph */
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publicvoidclear() {
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vertices.clear();
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neighbors.clear();
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}
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@Override/** Add a vertex to the graph */
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publicbooleanaddVertex(Vvertex) {
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if (!vertices.contains(vertex)){
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vertices.add(vertex);
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neighbors.add(newArrayList<Edge>());
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returntrue;
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}
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else {
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returnfalse;
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}
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}
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/** Add an edge to the graph */
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protectedbooleanaddEdge(Edgee) {
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if (e.u <0 ||e.u >getSize() -1)
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thrownewIllegalArgumentException("No such index: " +e.u);
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if (e.u <0 ||e.v >getSize() -1)
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thrownewIllegalArgumentException("No such index: " +e.u);
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if (!neighbors.get(e.u).contains(e)) {
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neighbors.get(e.u).add(e);
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returntrue;
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}
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else {
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returnfalse;
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}
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}
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@Override/** Add an edge to the graph */
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publicbooleanaddEdge(intu,intv) {
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returnaddEdge(newEdge(u,v));
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}
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/** Edge inner class inside the AbstractGraph class */
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publicstaticclassEdge {
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publicintu;// Starting vertex of the edge
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publicintv;
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/** Construct an edge for (u, v) */
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publicEdge(intu,intv) {
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this.u =u;
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this.v =v;
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}
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publicbooleanequals(Objecto) {
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returnu == ((Edge)o).u &&v == ((Edge)o).v;
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}
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}
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@Override/** Obtain a DFS tree starting from vertex v */
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publicTreedfs(intv) {
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List<Integer>searchOrder =newArrayList<>();
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int[]parent =newint[vertices.size()];
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for (inti =0;i <parent.length;i++)
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parent[i] = -1;// Initialize parent[i] to -1
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// Mark visited vertices
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boolean[]isVisited =newboolean[vertices.size()];
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// Recursively search
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dfs(v,parent,searchOrder,isVisited);
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// Return a search tree
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returnnewTree(v,parent,searchOrder);
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}
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/** Recursive method for DFS search */
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privatevoiddfs(intu,int[]parent,
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List<Integer>searchOrder,boolean[]isVisited) {
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// Store the visited vertex
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searchOrder.add(u);
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isVisited[u] =true;// Vertex v visited
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for (Edgee :neighbors.get(u)) {
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if (!isVisited[e.v]) {
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parent[e.v] =u;// The parent of vertex e.v is u
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dfs(e.v,parent,searchOrder,isVisited);// Recursive search
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}
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}
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}
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@Override/** Starting bfs search from vertex v */
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publicTreebfs(intv) {
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List<Integer>searchOrder =newArrayList<>();
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int[]parent =newint[vertices.size()];
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for (inti =0;i <parent.length;i++) {
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parent[i] = -1;// Initialize parent[i] to -q
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}
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java.util.LinkedList<Integer>queue =
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newjava.util.LinkedList<>();// List used as a queue
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boolean[]isVisited =newboolean[vertices.size()];
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queue.offer(v);// Enqueue v
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isVisited[v] =true;// Mark it visited
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while (!queue.isEmpty()) {
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intu =queue.poll();// Dequeue to u
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searchOrder.add(u);// u searched
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for (Edgee :neighbors.get(u)) {
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if (!isVisited[e.u]) {
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queue.offer(e.v);// Enqueue w
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parent[e.v] =u;// The parent of w is u
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isVisited[e.v] =true;// mark it visited
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}
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}
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}
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returnnewTree(v,parent,searchOrder);
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}
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/** Tree inner class inside the AbstractGraph class */
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publicclassTree {
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privateintroot;// The root of the Tree
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privateint[]parent;// Store the parent of each vertex
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privateList<Integer>searchOrder;// Store the search order
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/** Construct a tree with root, parent, and searchOrder */
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publicTree(introot,int[]parent,List<Integer>searchOrder) {
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this.root =root;
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this.parent =parent;
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this.searchOrder =searchOrder;
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}
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/** Return the root of the tree */
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publicintgetRoot() {
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returnroot;
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}
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/** Return the parent of vertex v */
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publicintgetParent(intv) {
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returnparent[v];
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}
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/** Return an array representing search order */
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publicList<Integer>getSearchOrder() {
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returnsearchOrder;
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}
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/** Return number of vertices found */
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publicintgetNumberOfVerticesFound() {
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returnsearchOrder.size();
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}
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/** Return the path of vertices from a vertex to the root */
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publicList<V>getPath(intindex) {
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ArrayList<V>path =newArrayList<>();
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do {
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path.add(vertices.get(index));
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index =parent[index];
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}
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while (index != -1);
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returnpath;
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}
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/** Print a path from the root to vertex v */
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publicvoidprintPath(intindex) {
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List<V>path =getPath(index);
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System.out.print("A path from " +vertices.get(root) +" to " +
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vertices.get(index) +": ");
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for (inti =path.size() -1;i >=0;i--)
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System.out.print(path.get(i) +" ");
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}
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/** Print the whole tree */
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publicvoidprintTree() {
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System.out.println("Root is: " +vertices.get(root));
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System.out.print("Edges: ");
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for (inti =0;i <parent.length;i++) {
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if (parent[i] != -1) {
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// Display an edge
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System.out.print("(" +vertices.get(parent[i]) +", " +
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vertices.get(i) +") ");
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}
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}
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System.out.println();
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}
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}
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}
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/*********************************************************************************
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* (Create a file for a graph) Modify Listing 28.1, TestGraph.java, to create a *
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* file representing graph1. The file format is described in Programming Exercise *
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* 28.1. Create the file from the array defined in lines 8–21 in Listing 28.1. *
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* The number of vertices for the graph is 12, which will be stored in the first *
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* line of the file. The contents of the file should be as follows: *
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*********************************************************************************/
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publicclassExercise_28_02 {
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publicstaticvoidmain(String[]args)throwsException {
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finalintNUMBER_OF_VERTICES =12;
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// Edge array from Listing 28.1 lines 8-21
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int[][]edges = {
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{0,1}, {0,3}, {0,5},
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{1,0}, {1,2}, {1,3},
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{2,1}, {2,3}, {2,4}, {2,10},
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{3,0}, {3,1}, {3,2}, {3,4}, {3,5},
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{4,2}, {4,3}, {4,5}, {4,7}, {4,8}, {4,10},
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{5,0}, {5,3}, {5,4}, {5,6}, {5,7},
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{6,5}, {6,7},
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{7,4}, {7,5}, {7,6}, {7,8},
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{8,4}, {8,7}, {8,9}, {8,10}, {8,11},
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{9,8}, {9,11},
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{10,2}, {10,4}, {10,8}, {10,11},
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{11,8}, {11,9}, {11,10}
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};
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// Create a graph
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Graph<Integer>graph =newUnweightedGraph<>(edges,NUMBER_OF_VERTICES);
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java.io.Filefile =newjava.io.File("GraphFile.txt");
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if (file.exists()) {
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System.out.print("File already exists");
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System.exit(0);
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}
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try (
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// Create writer
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java.io.PrintWriteroutput =newjava.io.PrintWriter(file);
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) {
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// Write graph to file
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output.println(graph.getSize());
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for (inti =0;i <graph.getSize();i++) {
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output.print(graph.getVertex(i) +" ");
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for (Integere :graph.getNeighbors(i)) {
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output.print(e +" ");
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}
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output.println();
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}
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}
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}
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}
811 Bytes
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publicinterfaceGraph<V> {
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/** Returns the number of vertices in the graph */
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publicintgetSize();
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/** Return the vertices in the graph */
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publicjava.util.List<V>getVertices();
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/** Return the object for the specified vertex index */
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publicVgetVertex(intindex);
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/** Return the index for the specified vertex object */
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publicintgetIndex(Vv);
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/** Return the neighbors of vertex with the specified index */
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publicjava.util.List<Integer>getNeighbors(intindex);
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/** Return degree for a specified vertex */
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publicintgetDegree(intv);
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/** Prints the edges */
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publicvoidprintEdges();
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/** Clears the graph */
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publicvoidclear();
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/** Add a vertex to the graph */
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publicbooleanaddVertex(Vvertex);
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/** Add an edge to the graph */
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publicbooleanaddEdge(intu,intv);
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/** Obtains a depth-frist search tree starting from v */
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publicAbstractGraph<V>.Treedfs(intv);
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/** Obtains a breath-first search tree starting from v */
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publicAbstractGraph<V>.Treebfs(intv);
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}
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12
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0 1 3 5
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1 0 2 3
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2 1 3 4 10
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3 0 1 2 4 5
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4 2 3 5 7 8 10
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5 0 3 4 6 7
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6 5 7
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7 4 5 6 8
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8 4 7 9 10 11
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9 8 11
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10 2 4 8 11
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11 8 9 10
809 Bytes
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