CharArrayReader
CharArrayReader 是字符數組輸入流。它和ByteArrayInputStream類似，只不過ByteArrayInputStream是字節數組輸入流，而CharArray是字符數組輸入流。 CharArrayReader 是用於讀取字符數組，它繼承於Reader。操作的數據是以字符為單位！
CharArrayReader 函數列表：
CharArrayReader(char[] buf)CharArrayReader(char[] buf, int offset, int length)void close()void mark(int readLimit)boolean markSupported()int read()int read(char[] buffer, int offset, int len)boolean ready()void reset()long skip(long charCount)
示例代碼:
關於CharArrayReader中API的詳細用法，參考示例代碼(CharArrayReaderTest.java)：
import java.io.CharArrayReader;import java.io.CharArrayWriter;import java.io.IOException;public class CharArrayReaderTest { private static final int LEN = 5; // 對應英文字母“abcdefghijklmnopqrstuvwxyz” private static final char[] ArrayLetters = new char[] {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'}; public static void main(String[] args) { tesCharArrayReader() ; } /** * CharArrayReader的API測試函數*/ private static void tesCharArrayReader() { try { // 創建CharArrayReader字符流，內容是ArrayLetters數組CharArrayReader car = new CharArrayReader(ArrayLetters); // 從字符數組流中讀取5個字符for (int i=0; i<LEN; i++) { // 若能繼續讀取下一個字符，則讀取下一個字符if (car.ready() == true) { // 讀取“字符流的下一個字符” char tmp = (char)car.read(); System.out.printf("%d : %c/n", i, tmp); } } // 若“該字符流”不支持標記功能，則直接退出if (!car.markSupported()) { System.out.println("make not supported!"); return ; } // 標記“字符流中下一個被讀取的位置”。即--標記“f”，因為因為前面已經讀取了5個字符，所以下一個被讀取的位置是第6個字符” // (01), CharArrayReader類的mark(0)函數中的“參數0”是沒有實際意義的。 // (02), mark()與reset()是配套的，reset()會將“字符流中下一個被讀取的位置”重置為“mark()中所保存的位置” car.mark(0); // 跳過5個字符。跳過5個字符後，字符流中下一個被讀取的值應該是“k”。 car.skip(5); // 從字符流中讀取5個數據。即讀取“klmno” char[] buf = new char[LEN]; car.read(buf, 0, LEN); System.out.printf("buf=%s/n", String.valueOf(buf)); // 重置“字符流”：即，將“字符流中下一個被讀取的位置”重置到“mark()所標記的位置”，即f。 car.reset(); // 從“重置後的字符流”中讀取5個字符到buf中。即讀取“fghij” car.read(buf, 0, LEN); System.out.printf("buf=%s/n", String.valueOf(buf)); } catch (IOException e) { e.printStackTrace(); } }}運行結果：
0 : a1 : b2 : c3 : d4 : ebuf=klmnobuf=fghij
CharArrayWriter
CharArrayReader 用於寫入數據符，它繼承於Writer。操作的數據是以字符為單位！
CharArrayWriter 函數列表
CharArrayWriter()CharArrayWriter(int initialSize)CharArrayWriter append(CharSequence csq, int start, int end)CharArrayWriter append(char c)CharArrayWriter append(CharSequence csq)void close()void flush()void reset()int size()char[] toCharArray()String toString()void write(char[] buffer, int offset, int len)void write(int oneChar)void write(String str, int offset, int count)void writeTo(Writer out)
示例代碼：
關於CharArrayWriter中API的詳細用法，參考示例代碼(CharArrayWriterTest.java)：
import java.io.CharArrayReader;import java.io.CharArrayWriter;import java.io.IOException;public class CharArrayWriterTest { private static final int LEN = 5; // 對應英文字母“abcdefghijklmnopqrstuvwxyz” private static final char[] ArrayLetters = new char[] {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'}; public static void main(String[] args) { tesCharArrayWriter() ; } /** * CharArrayWriter的API測試函數*/ private static void tesCharArrayWriter() { try { // 創建CharArrayWriter字符流CharArrayWriter caw = new CharArrayWriter(); // 寫入“A”個字符caw.write('A'); // 寫入字符串“BC”個字符caw.write("BC"); //System.out.printf("caw=%s/n", caw); // 將ArrayLetters數組中從“3”開始的後5個字符(defgh)寫入到caw中。 caw.write(ArrayLetters, 3, 5); //System.out.printf("caw=%s/n", caw); // (01) 寫入字符0 // (02) 然後接著寫入“123456789” // (03) 再接著寫入ArrayLetters中第8-12個字符(ijkl) caw.append('0').append("123456789").append(String.valueOf(ArrayLetters), 8, 12); System.out.printf("caw=%s/n", caw); // 計算長度int size = caw.size(); System.out.printf("size=%s/n", size); // 轉換成byte[]數組char[] buf = caw.toCharArray(); System.out.printf("buf=%s/n", String.valueOf(buf)); // 將caw寫入到另一個輸出流中CharArrayWriter caw2 = new CharArrayWriter(); caw.writeTo(caw2); System.out.printf("caw2=%s/n", caw2); } catch (IOException e) { e.printStackTrace(); } }}運行結果：
caw=ABCdefgh0123456789ijklsize=22buf=ABCdefgh0123456789ijklcaw2=ABCdefgh0123456789ijkl