create a rock-paper-scissors program in Java

/** Regular rock-paper-scissors computer player*/
public class OrderedComputerPlayer extensionsPlayer{
    protected Hand goo, choki, par;
    // a random number used to make a decision

    /** constructor, name of player*/
    public OrderedComputerPlayer(String name){
    super(name);
    // set one's hands
    goo=new Goo();
    choki=new Choki();
    par = new Par();
    
    }

    /** touch the num player of the match
     *  Override Player showHand
     */
    public Hand showHand(int match, int num) {
        
    switch(num%4){
    case1:return goo;
        case2—return par;
        case3—return choki; 
        case0:return goo; 
        } num++;return goo;
    }
}

/** Regular rock-paper-scissors computer player*/
public class NormalComputerPlayer extensionsPlayer{
    protected Hand goo, choki, par;
    protected java.util.Random random;// random number used to make a decision

    /** constructor, name of player*/
    publicNormalComputerPlayer(String name){
    super(name);
    // set one's hands
    goo=new Goo();
    choki=new Choki();
    par = new Par();
    random = new java.util.Random();
    }

    /** touch the num player of the match
     *  Override Player showHand
     */
    public Hand showHand(int match, int num) {
    int hand = random.nextInt(3);
    if(hand==0){
        return goo;
    } else if(hand==1){
        return choki;
    } else{
        return par;
    }
    }
}

/** Class for starting rock-paper-scissors*/
public class Janken {
    public static void main(String args[]){
    try{
        Judge judge=new Judge(); // Create an umpire

        // Create players and register with referees
        Player jhon = new OrderedComputerPlayer("Jhon");
        judge.registerPlayer(jhon);
        Player Paul = new NormalComputerPlayer("Paul");
        judge.registerPlayer(paul);

        // Rock-paper-scissors starts in the third round.
        judge.startJankens(3);
    }
    catch(JankenExceptione){
        System.err.println("Error:"+e.getMessage()));
    }
    }
}

/** Rock-paper-scissors player abstract class*/
public abstract class Player {
    protected String name;// Name of the player
    protected int matches; // matches (the winner wins first matches)
    protected int wins; // player wins
    protected int losses;// Number of player losses

    /** constructor, name of player*/
    public Player (String name) {
    this.name = name; // Name of the player
    wins=losts=0;// Initialize win/loss
    }

    /** Returns the name of the player*/
    public String getName() {
    return name;
    }

    /** a method of determining how many games to play
     */
    public void setMatches(int matches) {
    this.matches = matches;
    }

    /** 
     *   method of being informed that someone has won
     */
    public void youWon() {
    wins++;
    }

    /** 
     *   method of being informed of a defeat
     */
    public void youLost() {
    losts++;
    }


    /** touch the num player of the match
     *   It's an abstract method, so it overrides in subclasses.
     */
    public abstract Hand showHand (int match, int num);
}

$java Janken
Match 1: Jan Ken Pon!
Match 1-1:
Jhon's hand is Goo
Paul's hand is Goo

Aikode Sho
Match 1-2:
Jhon's hand is Par
Paul's hand is Goo

Match 1: Jhonwon.

Match 2: Jan Ken Pon!
Match 2-1:
Jhon's hand is Goo
Paul's hand is Par

Match 2: Paul won.

Match 3: Jan Ken Pon!
Match 3-1:
Jhon's hand is Goo
Paul's hand is Choki

Match 3: Jhon won.

Match 4: Jan Ken Pon!
Match 4-1:
Jhon's hand is Goo
Paul's hand is Goo

Aikode Sho
Match 4-2:
Jhon's hand is Par
Paul's hand is Choki

Match 4: Paul won.

Match 5: Jan Ken Pon!
Match 5-1:
Jhon's hand is Goo
Paul's hand is Choki

Match 5: Jhonwon.

Jhon is a champion.
Jhon: 3 wins
Paul—2 wins

$java Janken
Match 1: Jan Ken Pon!
Match 1-1:
Jhon's hand is Goo
Paul's hand is Goo

Aikode Sho
Match 1-2:
Jhon's hand is Goo
Paul's hand is Goo

Aikode Sho
Match 1-3:
Jhon's hand is Goo
Paul's hand is Goo

Aikode Sho
Match 1-4:
Jhon's hand is Goo
Paul's hand is Goo

Aikode Sho
Match 1-5:
Jhon's hand is Goo
Paul's hand is Choki

Match 1: Jhonwon.

Match 2: Jan Ken Pon!
Match 2-1:
Jhon's hand is Par
Paul's hand is Par

Aikode Sho
Match 2-2:
Jhon's hand is Par
Paul's hand is Goo

Match 2: Jhonwon.

Match 3: Jan Ken Pon!
Match 3-1:
Jhon's hand is Choki
Paul's hand is Par

Match 3: Jhon won.

Jhon is a champion.
Jhon: 3 wins
Paul: 0 wins

$java Janken
Match 1: Jan Ken Pon!
Match 1-1:
Jhon's hand is Goo
Paul's hand is Goo

Aikode Sho
Match 1-2:
Jhon's hand is Par
Paul's hand is Goo

Match 1: Jhonwon.

Match 2: Jan Ken Pon!
Match 2-1:
Jhon's hand is Choki
Paul's hand is Par

Match 2: Jhonwon.

Match 3: Jan Ken Pon!
Match 3-1:
Jhon's hand is Goo
Paul's hand is Par

Match 3: Paul won.

Match 4: Jan Ken Pon!
Match 4-1:
Jhon's hand is Goo
Paul's hand is Par

Match 4: Paul won.

Match 5: Jan Ken Pon!
Match 5-1:
Jhon's hand is Par
Paul's hand is Goo

Match 5: John won.

Jhon is a champion.
Jhon: 3 wins
Paul—2 wins

publicHandshowHand(int match, int num){
        
    switch(num%4){
    　　case1:return goo;
        case2—return par;
        case3—return choki; 
        case0:return goo; 
        } num++;return goo;
    }