Collection - Related information

  • Is there an ordered Map? with better performance than TreeMap

    during the interview, the interviewer told me that the performance of TreeMap was not good. Could you switch to another one? at that time, I thought he was fooling me, but now I still haven t found an orderly map with better performance! ...

  • Why did java.util.ArrayList repeat implements java.util.List?

    < hr > look at the ArrayList parent structure first look at ArrayList signature public class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, java.io.Serializable question: now that ...

  • MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
    MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e98d9d-474ca.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
    MySQL Errno : 1021
    Message : Disk full (/tmp/#sql-temptable-64f5-1e98d9d-474ca.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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