import Stack.Array.Stack;
// import Stack.List.Stack;
 
public class Main {
    private static void testOverflow() {
        Stack stack = new Stack();
        try {
            while (true) {
                Object o = new Object();
                System.out.printf("現在要素数は%dです。オブジェクト%sを追加します。%n", stack.size(), o); // これも課題としては不要
                stack.push(o);
            }
        } catch (Stack.StackException e) {
            System.err.printf("スタックのサイズは%dです。これ以上要素は追加できません。%n", stack.size());
        }
    }
 
    private static void testUnderflow() {
        Stack stack = new Stack();
        try {
            /* // 空のスタックからポップするだけの課題なので要らないけれど
               // stack.pop();の替わりにコメント内の方にすると、追加してから過剰に削除する
            for (int i = 0; i < 10; i++) {
                Object o = new Object();
                System.out.printf("現在要素数は%dです。オブジェクト%sを追加します。%n", stack.size(), o);
                stack.push(o);
            }
            System.out.printf("現在要素数は%dです。%n", stack.size());
            while (true) {
                System.out.printf("オブジェクト%sが取り出されました。", stack.pop());
                System.out.printf("現在要素数は%dです。%n", stack.size());
            }
            */
            stack.pop();
        } catch (Stack.StackException e) {
            System.err.println("スタックは空です。要素を取り出すことはできません。");
        }
    }
 
    public static void main(String[] args) {
        System.out.println("--- testOverflow");
        testOverflow();
        System.out.println("--- testUnderflow");
        testUnderflow();
    }
}
 

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