Warshall算法的实现（两种方式）

import java.util.*;
public class TestDemo {
	public static void main(String[] args){
		System.out.print("请输入矩阵的阶数:");
		Scanner input = new Scanner(System.in);
		int n = input.nextInt();
		System.out.print("请输入矩阵:");
		int [][] arr = new int [n][n];
		for(int i = 0;i < n;i++){
			for(int j = 0;j < n;j++){
				arr[i][j] = input.nextInt();
			}
		}
		for(int x = 0;x < n;x++){
			for(int y = 0;y < n;y++){
				if(arr[y][x] == 1){
					for(int k = 0;k < n;k++){
						arr[y][k] = (arr[y][k]) | (arr[x][k]);
					}
				}
			}
		}
		System.out.println("传递闭包的最终结果:");
		for(int a = 0;a < n;a++){
			for(int b = 0;b < n;b++){
				System.out.print(arr[a][b]);
			}
			System.out.println();
		}
	}
}	

方法二：

import java.util.*;
public class TestDemo {
	public static void main(String[] args){
		System.out.print("请输入矩阵的阶数:");
		Scanner input = new Scanner(System.in);
		int n = input.nextInt();
		System.out.print("请输入矩阵:");
		int [][] arr = new int [n][n];
		for(int i = 0;i < n;i++){
			for(int j = 0;j < n;j++){
				arr[i][j] = input.nextInt();
			}
		}
		for(int k = 0;k < n;k++){
			for(int i = 0;i < n;i++){
				for(int j = 0;j < n;j++){
					arr[i][j] |= arr[i][k] * arr[k][j];
				}
			}
		}
		System.out.println("传递闭包的最终结果:");
		for(int a = 0;a < n;a++){
			for(int b = 0;b < n;b++){
				System.out.print(arr[a][b]);
			}
			System.out.println();
		}
	}
}