如何在循环java中读取两个输入

Question

public class Example{

public static void main(String args[]){

    Map<String,Integer> mapSub = new HashMap<String,Integer>();
      for (int i=0;i<nbSubnet;i++){
        System.out.println("Enter name of the subnet "+i+" : ");
        String nameSubnet = scanner.nextLine();
        System.out.println("Enter the size of the subnet "+i+" : ");
        int sizeSubnet = scanner.nextInt();

        mapSub.put(nameSubnet, sizeSubnet);
    }
  }
}

Enter name of the subnet 0 : 
Enter the size of the subnet 0 : 
IT
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at view.Main.main(Main.java:60)

任何帮助都是非常感谢的

Answer 1

您需要验证您的输入，以确保得到所需的类型。it不是int，因此int sizeSubnet=scanner.nextInt()；当然会失败。

至少，尝试/捕捉是个好主意。

int sizeSubnet;
try{
    sizeSubnet = scanner.nextInt();
} catch () {
    sizeSubnet = 0;
}

如果您希望it应该是nameSubnet，那么您需要确保扫描器用一个额外的scanner.nextLine（）；等待输入。