CharArrayReader
CharArrayReader 是字符數(shù)組輸入流。它和ByteArrayInputStream類似，只不過ByteArrayInputStream是字節(jié)數(shù)組輸入流，而CharArray是字符數(shù)組輸入流。CharArrayReader 是用于讀取字符數(shù)組，它繼承于Reader。操作的數(shù)據(jù)是以字符為單位！
CharArrayReader 函數(shù)列表：
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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(guān)于CharArrayReader中API的詳細用法，參考示例代碼(CharArrayReaderTest.java)：
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import java.io.CharArrayReader;import java.io.CharArrayWriter;import java.io.IOException;public class CharArrayReaderTest { private static final int LEN = 5; // 對應(yīng)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(shù) */ private static void tesCharArrayReader() { try { // 創(chuàng)建CharArrayReader字符流，內(nèi)容是ArrayLetters數(shù)組 CharArrayReader car = new CharArrayReader(ArrayLetters); // 從字符數(shù)組流中讀取5個字符 for (int i=0; i<LEN; i++) { // 若能繼續(xù)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(jīng)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(shù)中的“參數(shù)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個字符后，字符流中下一個被讀取的值應(yīng)該是“k”。 car.skip(5); // 從字符流中讀取5個數(shù)據(jù)。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“重置后的字符流”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(jié)果：
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0 : a1 : b2 : c3 : d4 : ebuf=klmnobuf=fghij |
CharArrayWriter
CharArrayReader 用于寫入數(shù)據(jù)符，它繼承于Writer。操作的數(shù)據(jù)是以字符為單位！
CharArrayWriter 函數(shù)列表
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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(guān)于CharArrayWriter中API的詳細用法，參考示例代碼(CharArrayWriterTest.java)：
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import java.io.CharArrayReader;import java.io.CharArrayWriter;import java.io.IOException;public class CharArrayWriterTest { private static final int LEN = 5; // 對應(yīng)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(shù) */ private static void tesCharArrayWriter() { try { // 創(chuàng)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(shù)組中從“3”開始的后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) 然后接著寫入“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(zhuǎn)換成byte[]數(shù)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(jié)果：
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caw=ABCdefgh0123456789ijklsize=22buf=ABCdefgh0123456789ijklcaw2=ABCdefgh0123456789ijkl |
