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| import java.util.Arrays;
public class Dijkstra {
public static void main(String[] args) { char[] vertex = {'A', 'B', 'C', 'D', 'E', 'F', 'G'}; int[][] matrix = new int[vertex.length][vertex.length]; final int N = 65535; matrix[0] = new int[]{N, 5, 7, N, N, N, 2}; matrix[1] = new int[]{5, N, N, 9, N, N, 3}; matrix[2] = new int[]{7, N, N, N, 8, N, N}; matrix[3] = new int[]{N, 9, N, N, N, 4, N}; matrix[4] = new int[]{N, N, 8, N, N, 5, 4}; matrix[5] = new int[]{N, N, N, 4, 5, N, 6}; matrix[6] = new int[]{2, 3, N, N, 4, 6, N}; DGraph graph = new DGraph(vertex, matrix); graph.showGraph(); graph.dsj(2); graph.showDijkstra();
}
}
class DGraph { private char[] vertex; private int[][] matrix; private VisitedVertex vv;
public DGraph(char[] vertex, int[][] matrix) { this.vertex = vertex; this.matrix = matrix; }
public void showDijkstra() { vv.show(); }
public void showGraph() { for (int[] link : matrix) { System.out.println(Arrays.toString(link)); } }
public void dsj(int index) { vv = new VisitedVertex(vertex.length, index); update(index); for (int j = 1; j < vertex.length; j++) { index = vv.updateArr(); update(index); } }
private void update(int index) { int len = 0; for (int j = 0; j < matrix[index].length; j++) { len = vv.getDis(index) + matrix[index][j]; if (!vv.in(j) && len < vv.getDis(j)) { vv.updatePre(j, index); vv.updateDis(j, len); } } } }
class VisitedVertex { public int[] already_arr; public int[] pre_visited; public int[] dis;
public VisitedVertex(int length, int index) { this.already_arr = new int[length]; this.pre_visited = new int[length]; this.dis = new int[length]; Arrays.fill(dis, 65535); this.already_arr[index] = 1; this.dis[index] = 0;
}
public boolean in(int index) { return already_arr[index] == 1; }
public void updateDis(int index, int len) { dis[index] = len; }
public void updatePre(int pre, int index) { pre_visited[pre] = index; }
public int getDis(int index) { return dis[index]; }
public int updateArr() { int min = 65535, index = 0; for (int i = 0; i < already_arr.length; i++) { if (already_arr[i] == 0 && dis[i] < min) { min = dis[i]; index = i; } } already_arr[index] = 1; return index; }
public void show() {
System.out.println("=========================="); for (int i : already_arr) { System.out.print(i + " "); } System.out.println(); for (int i : pre_visited) { System.out.print(i + " "); } System.out.println(); for (int i : dis) { System.out.print(i + " "); } System.out.println(); char[] vertex = {'A', 'B', 'C', 'D', 'E', 'F', 'G'}; int count = 0; for (int i : dis) { if (i != 65535) { System.out.print(vertex[count] + "(" + i + ") "); } else { System.out.println("N "); } count++; } System.out.println();
} }
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