CODEWITHSUNDEEP
javaswitch-statement
user3852039
user3852039

Reputation: 67

Using switchcase to check if userinput is a string or int or a float

Basically I would like to build a switchcase statement if check if a user input is a integer , float or a String. I would like to use methods such as hasCheckInt() , hasCheckDouble() to check the respective datatype.

Some of the code is missing yes because I do not know what to put in. Forgive the java noob.

import java.util.Scanner;
public class helloWorld {
public static void main(String[] args) {
      Scanner userInput = new Scanner(System.in);
      switch()) {
      case 1: 

      if(userInput.hasNextInt()) {
      System.out.println("Int");
      }
      break;



     case 2: 
     if(userInput.hasNextLine()) {
     System.out.println("String");
     }
     break;
     }
     }
     }

Upvotes: 1

Views: 66

Answers (1)

T.J. Crowder
T.J. Crowder

Reputation: 1074989

Basically I would like to build a switchcase statement if check if a user input is a integer , float or a String. I would like to use methods such as hasCheckInt() , hasCheckDouble() to check the respective datatype.

You can't, the cases of a switch must be constants, not the results of an expression (including a function call).

Instead, you'll need if/else if/else

if (hasCheckInt(argumentHere)) {
    // `hasCheckInt` returned `true`
    // ...
}
else if (hasCheckDouble(argumentHere)) {
    // `hasCheckDouble` returned `true`
    // ...
}
else {
    // None of the above matched
}

Upvotes: 1

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