SquenceStack by java

class SStack<Type> {
    Type[] data;
    int len;
    int sp;
    
    public SStack(Type[] d) {
        // TODO Auto-generated constructor stub
        data = d;
        sp = 0;
        len = data.length;
    }
    
    private boolean IsFull() {
        return sp == len;
    }
    
    private boolean IsEmpty() {
        return sp == 0; 
    }
    
    public boolean Push(Type d) {
        if (IsFull())
            return false;
        
        data[sp++] = d;
        
        return true;
    }
    
    public Type Pop() {
        if (IsEmpty())
            return null;
        
        return data[--sp];
    }
    
}

public class SquenceStack {
    public static void main(String[] args) {
        String[] str = {"hello", "word"};
        String d;
        
        SStack<String> stk = new SStack<String>(str);
    
        for (String string : str) {
            stk.Push(string);
        }
        
        while ((d = stk.Pop()) != null)
            System.out.print(d + " ");
    }
}