Java Data Type - 如何从控制台中的用户输入读取和检查字符串

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {

    Scanner input = new Scanner(System.in);
    String answer = input.nextLine();

    if ("yes".equals(answer)) {
      System.out.println("Yea!");
    } else {
      System.out.println("No :(");
    }
  }
}