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一， 字串數組
建構函式：
String[] array = new String[5];
String[] array =new String[] {“aa”,”bb”,”cc”};
String[] array = {“aa”,”bb”,”cc”};
字串數組也被看做對象：
屬性：length （區別於字串的方法length()）
常用方法：void System.arraycopy(object[] from,intfromIndex, object[] to,int fromIndex,int count),系統的一個靜態方法
二，字串緩衝類StringBuffer
String類對象一旦聲明就不能改變，StringBuffer緩衝類實現了可變字元序列。
StringBuffer上的基本操作是append和insert方法，它們接受任意的資料，把所給資料轉化為一個字串，並把這個字串添加到緩衝區的末端或者插到指定地方。
public final class StringBuffer
extends Object
implements Serializable, CharSequence
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構造方法摘要 |
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StringBuffer()
構造一個其中不帶字元的字串緩衝區，初始容量為 16 個字元。 |
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StringBuffer(CharSequence seq)
public java.lang.StringBuilder(CharSequence seq) 構造一個字串緩衝區，它包含與指定的 CharSequence 相同的字元。 |
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StringBuffer(int capacity)
構造一個不帶字元，但具有指定初始容量的字串緩衝區。 |
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StringBuffer(String str)
構造一個字串緩衝區，並將其內容初始化為指定的字串內容。 |
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其他方法：
StringBuffer轉化為String對象：toString()
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String |
toString()
Returns a string representing the data in this sequence. |
StringBuffer的擴充appand():
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StringBuffer |
append(boolean b)
Appends the string representation of the boolean argument to the sequence. |
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StringBuffer |
append(char c)
Appends the string representation of the char argument to this sequence. |
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StringBuffer |
append(char[] str)
Appends the string representation of the char array argument to this sequence. |
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StringBuffer |
append(char[] str, int offset, int len)
Appends the string representation of a subarray of the char array argument to this sequence. |
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StringBuffer |
append(CharSequence s)
將指定的 CharSequence 添加到該序列。 |
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StringBuffer |
append(CharSequence s, int start, int end)
Appends a subsequence of the specified CharSequence to this sequence. |
等等…….
任意類型都將被轉化為字串加入緩衝末端
StringBuffer的插入insert():
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StringBuffer |
insert(int offset, Object obj)
Inserts the string representation of the Object argument into this character sequence. |
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StringBuffer |
insert(int offset, String str)
Inserts the string into this character sequence. |
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StringBuffer |
insert(int offset, char[] str)
Inserts the string representation of the char array argument into this sequence. |
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StringBuffer |
insert(int index, char[] str, int offset, int len)
Inserts the string representation of a subarray of the str array argument into this sequence. |
等等……
典型的其他動作：
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int |
length()
Returns the length (character count). |
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char |
charAt(int index)
Returns the char value in this sequence at the specified index. |
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String |
substring(int start)
Returns a new String that contains a subsequence of characters currently contained in this character sequence. |
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int |
indexOf(String str)
Returns the index within this string of the first occurrence of the specified substring. |
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StringBuffer |
replace(int start, int end, String str)
Replaces the characters in a substring of this sequence with characters in the specified String. |
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StringBuffer |
delete(int start, int end)
Removes the characters in a substring of this sequence. |
等等….. |
