else condion statement using java

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

        int age = 16;
        if(age <18){
            System.out.println("adult");
        } else {
            System.out.println("not adult");
        }
    }
    
}

import java.util.Scanner;
public class swithcaseif {
    public static void main(String []args){

        Scanner sc = new Scanner(System.in);
       System.out.println("enter the number button");

        int a = sc.nextInt();

        if (a == 1){
            System.out.println("namaste");
        } else if(a == 2){
            System.out.println("hello");

        } else if(a == 3){
            System.out.println("hi");
        } else if(a == 4) {
            System.out.println("hy");
        } else{
            System.out.println("invalid number try again");
        }
    }

    
}