alexrm84 · alexrm84 · Mar 8, 2019
diff --git a/Java4L7HW/src/alexrm84/Graph.java b/Java4L7HW/src/alexrm84/Graph.java
@@ -0,0 +1,180 @@
+package alexrm84;
+
+import java.util.*;
+import java.util.stream.Stream;
+
+public class Graph {
+
+    private final List<Vertex> vertices = new ArrayList<>();
+    private boolean[][] adjMat;
+
+    private int size;
+
+    public Graph(int maxVertexCount) {
+        this.adjMat = new boolean[maxVertexCount][maxVertexCount];
+    }
+
+    public void addVertex(String label){
+        vertices.add(new Vertex(label));
+        size++;
+    }
+
+    private int indexOf(String start){
+        for (int i = 0; i < size; i++) {
+            if (vertices.get(i).getLabel().equals(start)){
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    private boolean find(String start){
+        return indexOf(start)!=-1;
+    }
+
+    private boolean areAllExist(String start, String... others){
+        String[] allLabels = Arrays.copyOf(others,others.length+1);
+        allLabels[allLabels.length-1]=start;
+        return areAllExist(allLabels);
+    }
+
+    private boolean areAllExist(String... others){
+        return Stream.of(others).allMatch(this::find);
+    }
+
+    public void addEdge(String start, String finish){
+        if (!find(start)|| !find(finish)){
+            throw new IllegalArgumentException(String.format("Invalid label for vertex: [%s,%s]", start,finish));
+        }
+
+        int startIndex = indexOf(start);
+        int finishIndex = indexOf(finish);
+        adjMat[startIndex][finishIndex]=true;
+        adjMat[finishIndex][startIndex]=true;
+    }
+
+    public void addEdges(String start, String... others){
+        if (!areAllExist(start,others)){
+            throw new IllegalArgumentException("Invalid params");
+        }
+
+        int startIndex = indexOf(start);
+        for (int i = 0; i < others.length; i++) {
+            int finishIndex = indexOf(others[i]);
+            adjMat[startIndex][finishIndex]=true;
+            adjMat[finishIndex][startIndex]=true;
+        }
+    }
+
+    public void display(){
+        for (int i = 0; i < size; i++) {
+            System.out.print(vertices.get(i));
+            for (int j = 0; j < size; j++) {
+                if (adjMat[i][j]){
+                    System.out.print(" -> " + vertices.get(j));
+                }
+            }
+            System.out.println();
+        }
+    }
+
+    public void dfs(String startLabel){
+        if (!find(startLabel)){
+            throw new IllegalArgumentException("Invalid start label: " + startLabel);
+        }
+
+        Stack<Vertex> stack = new Stack<>();
+        Vertex vertex = vertices.get(indexOf(startLabel));
+        visitVertex(stack,vertex);
+
+        while (!stack.isEmpty()){
+            vertex=getNearUnvisitedVertex(stack.peek());
+            if (vertex==null){
+                stack.pop();
+                continue;
+            }
+            visitVertex(stack,vertex);
+        }
+    }
+
+    public void bfs(String startLabel){
+        if (!find(startLabel)){
+            throw new IllegalArgumentException("Invalid start label: " + startLabel);
+        }
+
+        Queue<Vertex> queue = new LinkedList<>();
+        Vertex vertex = vertices.get(indexOf(startLabel));
+        visitVertex(queue,vertex);
+
+        while (!queue.isEmpty()){
+            vertex=getNearUnvisitedVertex(queue.peek());
+            if (vertex==null){
+                queue.remove();
+                continue;
+            }
+            visitVertex(queue,vertex);
+        }
+    }
+
+    public void bfsFindRoute(String startLabel, String finishLabel){
+        if (!find(startLabel)|| !find(finishLabel)){
+            throw new IllegalArgumentException(String.format("Invalid label for vertex: [%s,%s]", startLabel,finishLabel));
+        }
+        Queue<Vertex> queue = new LinkedList<>();
+        Vertex vertex = vertices.get(indexOf(startLabel));
+        visitVertex(queue,vertex);
+        while (!queue.isEmpty()){
+            vertex=getNearUnvisitedVertex(queue.peek());
+            if (vertex==null){
+                queue.remove();
+                continue;
+            }
+            vertex.setPreviousCity(queue.peek());
+            if (vertex.getLabel().equals(finishLabel)){
+                showRoute(finishLabel);
+                return;
+            }
+            visitVertex(queue,vertex);
+        }
+    }
+
+    private Vertex getNearUnvisitedVertex(Vertex peek) {
+        int peekIndex=vertices.indexOf(peek);
+        for (int i = 0; i < size; i++) {
+            if (adjMat[peekIndex][i] && !vertices.get(i).isWasVisited()){
+                return vertices.get(i);
+            }
+        }
+        return null;
+    }
+
+    private void visitVertex(Stack<Vertex> stack, Vertex vertex) {
+        displayVertex(vertex);
+        stack.push(vertex);
+        vertex.markAsVisited();
+    }
+
+    private void visitVertex(Queue<Vertex> stack, Vertex vertex) {
+//        displayVertex(vertex);
+        stack.add(vertex);
+        vertex.markAsVisited();
+    }
+
+    private void displayVertex(Vertex vertex) {
+        System.out.println(vertex);
+    }
+
+    private void showRoute(String label){
+        Vertex vertex=vertices.get(indexOf(label));
+        Stack<String> stack= new Stack<>();
+        while (vertex.getPreviousCity()!=null){
+            stack.push(vertex.getPreviousCity().getLabel());
+            vertex=vertex.getPreviousCity();
+        }
+        stack.pop();
+        System.out.println("Самый короткий путь от города "+vertex.getLabel()+" до города "+label+" пройдет по следущим городам: ");
+        while (!stack.isEmpty()){
+            System.out.print(stack.pop()+" ");
+        }
+    }
+}
diff --git a/Java4L7HW/src/alexrm84/Main.java b/Java4L7HW/src/alexrm84/Main.java
@@ -0,0 +1,34 @@
+package alexrm84;
+
+public class Main {
+
+    public static void main(String[] args) {
+        testBfs();
+    }
+
+    private static void testBfs() {
+        Graph graph = new Graph(10);
+        graph.addVertex("Москва");
+        graph.addVertex("Тула");
+        graph.addVertex("Рязань");
+        graph.addVertex("Калуга");
+        graph.addVertex("Липецк");
+        graph.addVertex("Тамбов");
+        graph.addVertex("Орел");
+        graph.addVertex("Саратов");
+        graph.addVertex("Курск");
+        graph.addVertex("Воронеж");
+
+        graph.addEdges("Москва", "Тула", "Рязань", "Калуга");
+        graph.addEdge("Тула", "Липецк");
+        graph.addEdge("Липецк", "Воронеж");
+        graph.addEdge("Калуга", "Орел");
+        graph.addEdge("Орел", "Курск");
+        graph.addEdge("Курск", "Воронеж");
+        graph.addEdge("Рязань", "Тамбов");
+        graph.addEdge("Тамбов", "Саратов");
+        graph.addEdge("Саратов", "Воронеж");
+
+        graph.bfsFindRoute("Москва","Воронеж");
+    }
+}
diff --git a/Java4L7HW/src/alexrm84/Vertex.java b/Java4L7HW/src/alexrm84/Vertex.java
@@ -0,0 +1,58 @@
+package alexrm84;
+
+import java.util.Objects;
+
+public class Vertex {
+
+    private final String label;
+    private Vertex previousCity;
+    private boolean wasVisited;
+
+    public Vertex getPreviousCity() {
+        return previousCity;
+    }
+
+    public void setPreviousCity(Vertex previousCity) {
+        this.previousCity = previousCity;
+    }
+
+    public Vertex(String label) {
+        this.label = label;
+    }
+
+    public String getLabel() {
+        return label;
+    }
+
+    public boolean isWasVisited() {
+        return wasVisited;
+    }
+
+    public void resetState() {
+        this.wasVisited = false;
+    }
+
+    public void markAsVisited(){
+        this.wasVisited=true;
+    }
+
+    @Override
+    public String toString() {
+        return "Vertex{" +
+                "label='" + label + '\'' +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Vertex vertex = (Vertex) o;
+        return Objects.equals(label, vertex.label);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(label);
+    }
+}