java based calculator

Calculator.java

import java.util.Scanner;

public class Calculator {
    public static void main(String[] args) {
        int type;
        double first, secound, answer;
        Scanner scan = new Scanner(System.in);
        System.out.println("hello! what kind of math would you like to do today?");
        System.out.println("[1]: addition");
        System.out.println("[2]: subtraction");
        System.out.println("[3]: multiplacation");
        System.out.println("[4]: division");
        type = scan.nextInt();
        if(type == 1){
            System.out.println("enter first number:");
            first = scan.nextDouble();
            System.out.println("enter secound number");
            secound = scan.nextDouble();
            answer= first + secound;
            System.out.println(first +" plus "+ secound + " is "+answer );
        };
        if (type == 2){
            System.out.println("enter first number");
            first = scan.nextDouble();
            System.out.println("enter secound number");
            secound = scan.nextDouble();
            answer= first - secound;
            System.out.println(first +" minus "+ secound+" is "+answer);
        }
        if (type == 3) {
            System.out.println("enter first number");
            first = scan.nextDouble();
            System.out.println("enter secound number");
            secound = scan.nextDouble();
            answer=first*secound;
            System.out.println(first + " multiplied by "+secound+" is "+answer);
        }
        if (type == 4) {
            System.out.println("enter first number");
            first = scan.nextDouble();
            System.out.println("enter secound number");
            secound = scan.nextDouble();
            answer=first/secound;
            System.out.println(first+" divided by "+secound+" is "+answer);
        }
        if (type>4) {
            System.out.println("i dont understand you. please try again.");
        }
    }
}