字符串比较
https://blog.csdn.net/qq_42934779/article/details/90488814
//字符串比较用 equals 不用 ==
//判断字符串是否为空
TextUtils.isEmpty(item.wechatopenid)
//字符串替换，判断首字符
if (result.startsWith("，")){
result = result.replaceFirst("，", "");
}
//替换指定位置的字符
StringBuilder sb = new StringBuilder(idcard);
sb.replace(7, 10, "****");
String mid = sb.toString();
mid = mid.substring(0,15) + "***";
return mid;
java截取某个字符之前或者之后的字符串
https://www.cnblogs.com/kkxwze/p/11224693.html
String总结
https://www.jianshu.com/p/501dd5991428
format
https://www.jianshu.com/p/db53c3453749
getString()
https://www.jianshu.com/p/abd81ce77659
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