java.lang.Objects / org.apache.commons.lang.ObjectUtils;boolean isNull(Object obj); 判斷nulljava字符串常用方法,boolean equals(Object a, Object b); 等值判斷int hashCode(Object o); 哈希值String toString(Object o, String defaultValue);java類庫中文手冊,java
时间:2023-12-06 | 阅读:20