how to use covered decorator method

in Decorate Pattern ,i'm confuse about how to use decorator method. i have learned that decorate pattern is used add functions to base-class ,but i could call only the outermost decorator's method, so how should i use inner-decorator's method if it not write on interface. i'm not good at English,so i write a code to show my question.

public class OrderSystem {
public static void main(String[] args) {
    Pancakes pancakes = new MixedPancakes();
    pancakes = new Ham(pancakes);
    ((Ham) pancakes).hamState();    //call hamState
    pancakes = new Egg(pancakes);
    ((Egg) pancakes).eggState();
    //i can't call hamState() there because it not belong to Egg

    Pancakes pancakes1 = new Ham(new Egg(new FlourPancakes()));
    //similarly, i can't use eggState() there.
    System.out.println("订单:" + pancakes1.getDescription());
    System.out.println("价格：" + pancakes1.cost());
}
}
interface Pancakes {
public abstract String getDescription();

public abstract int cost();
}

abstract class Seasoning implements Pancakes {
@Override
public abstract String getDescription();
}

class Ham extends Seasoning {

Pancakes pancakes;

public Ham(Pancakes pancakes) {
    this.pancakes = pancakes;
}

@Override
public int cost() {
    return pancakes.cost() + 2;
}

@Override
public String getDescription() {
    return pancakes.getDescription() + "+火腿";
}

public void hamState() {
    System.out.println("火腿切碎");
}

}

class Egg extends Seasoning {

Pancakes pancakes;

public Egg(Pancakes pancakes) {
    this.pancakes = pancakes;
}

@Override
public int cost() {
    return pancakes.cost() + 1;
}

@Override
public String getDescription() {
    return pancakes.getDescription() + "+鸡蛋";
}

public void eggState() {
    System.out.println("鸡蛋打碎");
}
}

class MixedPancakes implements Pancakes {

@Override
public String getDescription() {
    return "五谷杂粮煎饼";
}

@Override
public int cost() {
    return 6;
}
}

class FlourPancakes implements Pancakes {

@Override
public String getDescription() {
    return "白面煎饼";
}

@Override
public int cost() {
    return 5;
}
}

as i asked in annotation ,when a decorator was wrapped by an other, only the method that declared in interface(like cost() and getDescription())will work,and other method won't be called anymore. i thought if i create a soldier, if i use a gun decorate him today, he will be shoot()--the gun's function. if i decorate him with sword tomorrow, he will not only could shoot() but also cut()--the sword's function. can i achieve it with Decorator Pattern? i sorry about any misnomer and thanks for your help.