{"blog_url":"https://junkobayashi.hatenablog.com/","provider_url":"https://hatena.blog","url":"https://junkobayashi.hatenablog.com/entry/2021/05/31/204823","published":"2021-05-31 20:48:23","type":"rich","height":"190","provider_name":"Hatena Blog","categories":["Java"],"blog_title":"JunKobayashi's Diary","title":"Java\u3067\u65e5\u4ed8\u3092\u8868\u3059\u6587\u5b57\u5217\u304c\u30ab\u30ec\u30f3\u30c0\u30fc\u306b\u5373\u3057\u3066\u3044\u308b\u304b\u5224\u5b9a\u3059\u308b","author_name":"JunKobayashi","image_url":null,"description":"\u898b\u51fa\u3057\u306e\u901a\u308a\u306e\u6a5f\u80fd\u3092\u6301\u3064\u30af\u30e9\u30b9\u3067\u3059\u3002\u5fc5\u8981\u306b\u5fdc\u3058\u3066YMD\u306e\u30d1\u30bf\u30fc\u30f3\u3068\u6b63\u898f\u8868\u73fe\u3092\u8ffd\u52a0\u3057\u3066\u3044\u3051\u3070\u3044\u3044\u611f\u3058\u306b\u4f7f\u3048\u308b\u3068\u601d\u3044\u307e\u3059\u3002isOnCalendar\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u305b\u3070\u5224\u5b9a\u3067\u304d\u307e\u3059\u3002 import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Arrays; import java.util.Optional; public class DateValidator { private DateValidator() { throw new IllegalStateException(\"Can\u2026","width":"100%","version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fjunkobayashi.hatenablog.com%2Fentry%2F2021%2F05%2F31%2F204823\" title=\"Java\u3067\u65e5\u4ed8\u3092\u8868\u3059\u6587\u5b57\u5217\u304c\u30ab\u30ec\u30f3\u30c0\u30fc\u306b\u5373\u3057\u3066\u3044\u308b\u304b\u5224\u5b9a\u3059\u308b - JunKobayashi&#39;s Diary\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_url":"https://blog.hatena.ne.jp/JunKobayashi/"}