[명품JAVA프로그래밍] 7장 실습문제 9번

interface IStack<T>{
	T pop();
	boolean push(T ob);
}

class MyStack<T> implements IStack<T>{
	int tos;
	Object [] stck;
	
	public MyStack() {
		tos = 0;
		stck = new Object[10];
	}
	
	@Override
	public T pop() {
		// TODO Auto-generated method stub
		if(tos == 0) return null;
		tos--;
		return (T)stck[tos];
	}

	@Override
	public boolean push(T ob) {
		// TODO Auto-generated method stub
		if(tos == 10) return false;
		stck[tos] = ob;
		tos++;
		return true;
	}


}

public class StackMamager {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		IStack<Integer> stack = new MyStack<Integer>();
		for(int i=0;i<10;i++) stack.push(i);
		while(true) {
			Integer n = stack.pop();
			if(n==null) break;
			System.out.print(n+" ");
		}
	}

}

결과

9 8 7 6 5 4 3 2 1 0