java代码实现构造超网

构造超网（Supernet）是将多个子网合并成一个更大的网络的过程。下面是一个简单的Java代码示例，演示了如何构造超网。

import java.util.*;

public class Supernet {
    
    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        
        List<String> subnets = new ArrayList<>();
        System.out.print("Enter the number of subnets: ");
        int n = sc.nextInt();
        sc.nextLine();
        
        for (int i = 0; i < n; i++) {
            System.out.print("Enter subnet " + (i+1) + ": ");
            String subnet = sc.nextLine();
            subnets.add(subnet);
        }
        
        String supernet = constructSupernet(subnets);
        System.out.println("Supernet: " + supernet);
    }
    
    public static String constructSupernet(List<String> subnets) {
        
        // Convert subnets to integer arrays
        List<int[]> subnetArrays = new ArrayList<>();
        for (String subnet : subnets) {
            int[] subnetArray = new int[4];
            String[] subnetParts = subnet.split("\\.");
            for (int i = 0; i < subnetParts.length; i++) {
                subnetArray[i] = Integer.parseInt(subnetParts[i]);
            }
            subnetArrays.add(subnetArray);
        }
        
        // Find the common prefix of the subnets
        int[] commonPrefix = findCommonPrefix(subnetArrays);
        int prefixLength = getPrefixLength(commonPrefix);
        
        // Construct the supernet
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < prefixLength; i++) {
            sb.append(commonPrefix[i]);
            if (i < prefixLength-1) {
                sb.append(".");
            }
        }
        sb.append(".0/");
        sb.append(prefixLength);
        
        return sb.toString();
    }
    
    public static int[] findCommonPrefix(List<int[]> subnetArrays) {
        
        int[] firstSubnet = subnetArrays.get(0);
        int[] commonPrefix = Arrays.copyOf(firstSubnet, 4);
        
        for (int i = 1; i < subnetArrays.size(); i++) {
            int[] subnet = subnetArrays.get(i);
            for (int j = 0; j < 4; j++) {
                if (subnet[j] != commonPrefix[j]) {
                    commonPrefix[j] = 0;
                    break;
                }
            }
        }
        
        return commonPrefix;
    }
    
    public static int getPrefixLength(int[] prefix) {
        
        int length = 0;
        for (int i = 0; i < 4; i++) {
            int octet = prefix[i];
            for (int j = 7; j >= 0; j--) {
                if ((octet & (1 << j)) == 0) {
                    return length;
                }
                length++;
            }
        }
        
        return length;
    }
}

这个程序首先提示用户输入子网的数量和每个子网的地址。然后，它将每个子网的地址转换为一个整数数组，并通过一个函数找到它们的公共前缀。最后，它使用公共前缀构造超网地址。

要运行此程序，请将其保存为Supernet.java文件，并使用以下命令编译和运行它：

javac Supernet.java
java Supernet