Floyd算法求最短路徑，JAVA實現

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Scanner;


public class TestMainIO {

	/**
	 * @param args
	 * @throws FileNotFoundException 
	 */
	public static void main(String[] args) throws FileNotFoundException {
		TestMainIO test_print = new TestMainIO();
		int[][] G = test_print.intputGragh("D:\\Users\\test.txt" , 6);
		int[][] Dis = test_print.floyd(G, 6);	
		test_print.printG(Dis, 6);
	}
	
	public void printG(int[][] G,int n){
		for(int i=0;i<n;i++){
			for(int j=0;j<n;j++){
				System.out.println(i+"->"+j+"  "+G[i][j]);
			}
		}
	}

	public int[][] intputGragh(String path , int num) throws FileNotFoundException{
		int[][] G = new int[num][num];
		for(int i=0;i<num;i++){
			for(int j=0;j<num;j++){
				G[i][j]=999;
			}
		}
		Scanner in = new Scanner(new FileInputStream(path));
		while (in.hasNext()) {
		    int i = in.nextInt();
		    int j = in.nextInt();
		    int weight = in.nextInt();
		    G[i][j] = weight;
		} 
		return G;
	}
	
	public int[][] floyd(int[][] G,int n){
		int[][] Dis= new int[n][n];
		for(int q=0;q<n;q++){
			for(int w=0;w<n;w++){
				Dis[q][w]=G[q][w];
			}
		}
			
		for(int k = 0; k < n; k++){
			for(int i=0; i < n; i++ ){
				for(int j=0; j < n; j++){
					if(Dis[i][j]>Dis[i][k]+Dis[k][j]){
						Dis[i][j]=Dis[i][k]+Dis[k][j];
					}
				}
			}
		}
		return Dis;
	}
}