Switch Lambda Operator in Java

class Main {
    
    
    public static void main(String[] args) {
        String str = "N";
        String result = switch(str) {
            case "A" -> "for Apple";
            case "B" -> "for Ball";
            case "C" -> "for Cat";
            case "D" -> "for Dog";
            default -> "for another else";
        };
        System.out.println(str + " " + result);
        
        
        int i = 10;
        int j = 0;
        System.out.println(calculate(i, j, "*"));
    }
    
    public static double calculate(int a, int b, String operator) {
        return switch(operator) {
            case "+" -> a + b;
            case "-" -> a - b;
            case "*" -> a * b;
            case "/" -> (double) a / b;
            default -> 0;
        };
    }
}