Arraylist - Related information

• MAX_ARRAY_SIZE problem in Java Source ArrayList (jdk1.8)

  private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8; private void grow(int minCapacity) { overflow-conscious code int oldCapacity = elementData.length; int newCapacity = oldCapacity + (oldCapacity >> 1...

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• Why is the insertion and deletion of ArrayList less efficient than LinkedList?

  ArrayList is based on an array. When deleting, the get position is O (1), and the delete complement is O (n). LinkedList is based on a linked list, and when deleted, the location is O (n), and the deletion is O (1). The operation of inserts is the sam...

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• Js multi-layer nested array to extract the data from the last layer?

  you need to get a collection of all the id of isCheck = true list: [{ id: 1 , isCheck: false, children: [{ id: 1-1 , isCheck: false, children: null }, { id: 1-2 , isCheck: true, children: null }] }, { id: ...

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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-64f5-2474bea-1884.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-2474bea-1884.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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