Belajar tipe data

class NonPrimitif {
    
    public static void main(String[] args) {
        String alamat ="Jl. Maharaja Indra No. 30";
        System.out.println("String alamat:"+ alamat);
        
        int[] angka ={ 10,3,44,21};
        System.out.println("contoh array :"+ angka[1]);
        
        contoh  c = new contoh();
        System.out.println("contoh object: "+ c.tampil());
        
    }
}
 class contoh { 
     
     private int angka = 10;
     
     public int tampil() {
         return angka;
         
     }
 }