Multi-word scanner input in java?

问题:

So I'm trying to use if-else statement dependant upon the user's input. It works when the user's input is only one word, however, multiple word inputs go unrecognized and triggers the else statement. How can i resolve this?

import java.util.Scanner;


public class MyFirstJavaClass {

public static void main(String[] args) {
    @SuppressWarnings("resource")
    Scanner myScanner = new Scanner(System.in);
    String answer;
    System.out.println("Catch the tiger or run away?");
    answer = myScanner.next();


         if (answer.equals("Catch the tiger"  )) {
            System.out.println("You've been mauled by a tiger! What were you thinking?");
            answer = myScanner.next();          

    } else {
        System.out.println("run away");
    }
  }
}

回答1:

Replace:

answer = myScanner.next();

With:

answer = myScanner.nextLine();

next will only read in the next value until it reaches a space or newline. You want to read in the full line before making the comparison

回答2:

try this :

Scanner scanner = new Scanner(System.in);
int choice = 0;
while (scanner.hasNext()){
    if (scanner.hasNextInt()){
        choice = scanner.nextInt();
        break;
    } else {
        scanner.next(); // Just discard this, not interested...
    }
}

Reference : Flush/Clear System.in (stdin) before reading

回答3:

Try this

import java.util.Scanner;

public class MyFirstJavaClass {

    public static void main(String[] args) {
        @SuppressWarnings("resource")
        Scanner myScanner = new Scanner(System.in);
        System.out.println("Catch the tiger or run away?");
        if (myScanner.hasNext("Catch the tiger")) {
            System.out.println("You've been mauled by a tiger! What were you thinking?");
        } else {
            System.out.println("run away");
        }
    }
}