1.構造函數
2.添加
public StringBuilder append(Object obj)
(Appends the string representation of the Object
argument.)
添加參數的字符串形式到目標對象中,可以是int,float,char,double,char [],boolean,String等類型
3.刪除
public StringBuilder delete(int start,int end)
(Removes the characters in a substring of this sequence. )
4.獲取指定下標字符
public char charAt(int index)
(Returns the char
value in this sequence at the specified index.)
5.長度
public int length()
(Returns the length (character count).)
6.獲取子串
7.轉爲字符串
8.獲取子串的位置
9.插入
public StringBuilder insert(int offset,Object obj)
(Inserts the string representation of the Object
argument into this character sequence.)
插入對象類型可以是int,float,char,double,char [],boolean,String等
10.替換
public StringBuilder replace(int start,int end,String str)
(Replaces the characters in a substring of this sequence with characters in the specified String
. )
對start,end範圍內替換爲目的字符串str
11.反轉
public StringBuilder reverse()
(Causes this character sequence to be replaced by the reverse of the sequence.)
返回反轉後的字符串
12.修改下標i的字符