Rock-paper-scissors in Java

apt install -y openjdk-14-jdk

import java.util.Random;

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

		Random rand = new Random(Integer.valueOf(args[0]));
		int comA = rand.nextInt(3);
		int comB = rand.nextInt(3);
		String strA, strB;
		strA = "";
		strB = "";
		switch(comA){
			case 0 :
				strA = "Goo";
				break;

			case 1 :
				strA = "Choki";
				break;

			case 2 :
				strA = "Par";
				break;

			default:
				strA = "";
				break;
		}
		switch(comB){
			case 0 :
				strB = "Goo";
				break;
			case 1 :
				strB = "Choki";
				break;
			case 2 :
				strB = "Par";
				break;

			default:
				strB = "";
				break;
		}
		if(comA == comB){
			System.out.println(
					"Computer A:" + strA
					);
			System.out.println(
					"Computer B:" + strB
					);
			System.out.println(
					"Aiko"
					);
		}
		else if(((comA == 0) && (comB == 1)) || ((comA == 1) && (comB == 2)) || ((comA == 2) && (comB == 0))){
			System.out.println(
					"Computer A:" + strA
					);
			System.out.println(
					"Computer B:" + strB
					);
			System.out.println(
					"Computer A wins"
					);
		}
		else{
			System.out.println(
					"Computer A:" + strA
					);
			System.out.println(
					"Computer B:" + strB
					);
			System.out.println(
					"Losing computer A"
					);
		}
	}
}

#compile
javac Janken.java

$ java Janken.java 
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
	at Janken.main(Janken.java:7)

$ java Janken.java 0
Computer A:Goo
Computer B:Choki
Computer A wins

$ java Janken.java 1
Computer A:Goo
Computer B:Choki
Computer A wins

$ java Janken.java 2
Computer A:Choki
Computer B:Goo
Losing computer A

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