Question

我想对我的输入进行验证，无论是字符串还是带有syso消息的double，它都会输出＆＃34;你的输入必须是字符串/双整数＆＃34;在适当情况下。

//scanner name weight height
Scanner userInputScanner = new Scanner(System.in);
System.out.print("Name your pet: ");
String newName = userInputScanner.nextLine();
KungFuPanda.setName(newName);
System.out.println("Pet weight (lbs): ");
double  newWeight= userInputScanner.nextDouble();
KungFuPanda.setWeight(newWeight);
System.out.println("Pet height (cm): ");
double  newHeight = userInputScanner.nextDouble();
KungFuPanda.setHeight(newHeight);

System.out.println("Name of our pet you have created is " + newName + ", it's weight     is " + newWeight + "lbs and it's height is "
            + newHeight + "cm.");

有人可以修改我的代码并向我解释这些变化吗？

Answer 1

为什么不使用检查下一个请求输入的方法？

 double newWeight;

 if(userInputScanner.hasNextDouble()) { 
      System.out.println("Pet weight (lbs): ");   
      newWeight= userInputScanner.nextDouble();
      KungFuPanda.setWeight(newWeight);
 } else {
      System.out.println("your input must be a String/double integer");
 }

 ... ... ...

 if(newWeight!=null) {
      System.out.println("Weight of our pet you have created is " + newWeight "+lbs.");
 } else {
   - error outprint -
 }

如果您的某个输入失败，请确保只在一切正确的情况下创建您的宠物。

java util-scanner输入验证

1 个答案: