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ArrayList set
2022-07-06 15:16:00 【Hand pluckable Xinchen】
1.ArrayList The basic method of set
Guide pack :java.util;
ArrayList< data type > Variable name = new ArrayList < data type > ();
Be careful : The data type must be a reference data type
2.ArrayList The common method of collection
boolean add(E e) Add the specified element to the end of the set , Returns whether the element was added successfully .
void add(int index,E e) Add the element in the specified position .
E get(int index) The return index value is index The elements of .
E set(int index , E e) Modify the specified index value element , Return to the modified element .
boolean remove(Object o) Deletes the specified element , Returns whether the deletion was successful .
E remove(int index) Delete the specified location element , Returns the deleted element .
int size() Returns the number of collection elements .
int indexOf(Object obj) Returns the position of the index value of the first occurrence of an element .
int lastlndexOf(Object obj) Return the index value position of the last occurrence of the element .
boolean contains(Object obj) Determine whether the element is included .
3.ArrayList Store basic data types
Basic types Packaging type
int Integer
char Character
byte Byte
short Short
long Long
float Float
double Double
boolean Boolean
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