どうしても、compareToが自信がなくなるので、メモ
"1".compareTo("2");// 1 ＜ 2 → -1
"1".compareTo("1");// 1 ＝ 1 → 0
"1".compareTo("0");// 1 ＞ 0 →1
IDEで出てこないものかね？ｗ
こっちのほうが覚えやすいか？
a.compareTo(b) < 0; // a ＜ b
a.compareTo(b) == 0; // a ＝ b
a.compareTo(b) > 0; // a ＞ b
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