title: String input doesn't work in if-else statement
body: <p>I'm new to Java, and I created some sort of a mini game, and I wanted players to choose whether or not they want to play again, I tried changing my start boolean variable into static type and adding some lines of code, but the code doesn't seem to work, every time I play the game, it did ask me if I want to replay or not, but the problem is that even though I typed "yes" to the console at the end, the game doesn't seem to restart. Can anyone help me please, I would be really appreciated, thanks!</p>
  
  <pre><code>import java.util.Random;
  import java.util.Scanner;
  
  //Rocks, papers, scissors game complied by William To.
  public class RockPaperScissor {
  static int gamePlays = 0;
  static boolean start = true;
  public static void main(String[] args) {
      while (start){
          @SuppressWarnings("resource")
          Scanner userInput = new Scanner(System.in);
          Random comOutput = new Random();
          System.out.println("Do you choose rock, paper or scissor?");
          String userChoice = userInput.nextLine();
          int comChoice = comOutput.nextInt(2);
          switch (userChoice){
  
          case "rock":
              if(comChoice == 0){
                  System.out.println("I choose rock too! That's a draw!");
              } else if(comChoice == 1){
                  System.out.println("I choose paper! I win!");
              } else {
                  System.out.println("I choose scissor! You win!");
              }
              break;
  
          case "paper":
              if(comChoice == 0){
                  System.out.println("I choose rock! You win!");
              } else if(comChoice == 1){
                  System.out.println("I choose paper too! That's a draw!");
              } else {
                  System.out.println("I choose scissor! I win!");
              }
              break;
  
          case "scissor":
              if(comChoice == 0){
                  System.out.println("I choose rock! I win!");
              } else if(comChoice == 1){
                  System.out.println("I choose paper! You win!");
              } else {
                  System.out.println("I choose scissor too! That's a draw!");
              }
              break;
          default :
              System.out.println("I don't think that's an option.");
              break;
          }
          gamePlays++;
          System.out.println("You've played " + gamePlays + " games.");
  
                 //BELOW IS THE PART I want to ask, what's wrong? 
  
          System.out.println("Do you want to play again?"); 
          String playAgain = userInput.next();
          if (playAgain == "yes"){
              System.out.println("Restarting game...");
              start = true;
          } else if (playAgain == "no") {
              System.out.println("Quitting game.");
              start = false;
          }
      }
  }   
  } 
  </code></pre>
  
  <p>The print out from Eclipse:</p>
  
  <pre><code>Do you choose rock, paper or scissor?  
  rock **//my input**    
  I choose paper! I win!  
  You've played 1 games.  
  Do you want to play again?    
  yes **//my input**    
  Do you choose rock, paper or scissor?  
  paper **//my input**    
  I choose paper too! That's a draw!  
  You've played 2 games.  
  Do you want to play again?  
  no **//my input**  
  Do you choose rock, paper or scissor? 
  </code></pre>