我想请求用户输入一个输入，如果它无效，我将推出一个错误语句，并请求用户输入另一个输入。我该如何编写一个循环，在给定错误后将用户保持在相同的输入请求中？我以前使用的方法都是try和except在python中。java中的等价物是什么？

import java.util.Scanner;
import java.util.Random;
public class Main {
  //Setting Moves List
  enum Move {
    ROCK,
    PAPER,
    SCISSORS
  }
  //Initiate Scanner and accept user input
  public static String getUserMove() {
    Scanner keyboard = new Scanner(System.in);
    String gesture = keyboard.nextLine();
    String userMove = gesture.toUpperCase();
    if (userMove.equals("ROCK") || userMove.equals("PAPER") || userMove.equals("SCISSORS")) {
      return userMove;
    } else {
      System.out.println("This is not a valid input." +
        "Please try again!");
      return "Invalid Input";
    }
  }
  //Get random input as CPU move
  public static String getAiMove() {
    String Ai;
    Random random = new Random();
    int input = random.nextInt(3);
    if (input == 1) {
      Ai = Move.ROCK.name();
    } else if (input == 2) {
      Ai = Move.PAPER.name();
    } else {
      Ai = Move.SCISSORS.name();
    }
    return Ai;
  }
  //Determine Winner Result
  public static void main(String args[]) {
    System.out.println("Choose your move against the CPU:");
    System.out.println("ROCK, PAPER, OR  SCISSORS");

    String playerMove = getUserMove();
    System.out.println("You threw: " + playerMove);
    if (!playerMove.equals("Invalid Input")) {
      String cpuMove = getAiMove();
      System.out.println("Computer threw: " + cpuMove);
      if (playerMove.equals(cpuMove)) {
        System.out.println("Tie! Nobody Wins!");
      }
      // Player is Rock
      else if (playerMove.equals(Move.ROCK.name())) {
        if (cpuMove.equals(Move.PAPER.name())) {

          System.out.println("You Lost! \nPaper beats Rock!");
        } else {
          System.out.println("You Win! \nRock beats Scissors!");
        }
      }
      // Player is Paper
      else if (playerMove.equals(Move.PAPER.name())) {
        if (cpuMove.equals(Move.SCISSORS.name())) {
          System.out.println("You Lost! \nScissors beats Paper!");
        } else {
          System.out.println("You Win! \nPaper beats Rock!");
        }
      }
      // Player is Scissors
      else {
        if (cpuMove.equals(Move.ROCK.name())) {
          System.out.println("You Lost! \nPaper beats Rock!");
        } else {
          System.out.println("You Win! \nRock beats Scissors !");
        }
      }
    }
  }
}