?? countreader.java
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import java.io.*;public class CountReader extends FilterReader { private int count = 0; private char lookFor = 0; public CountReader(Reader in, char lookFor) { super(in); this.lookFor = lookFor; } public int read() throws IOException { int character = super.read(); if ((char)character == lookFor) { count++; } return character; } public int read(char[] cbuf) throws IOException { int numChars = super.read(cbuf); int length = cbuf.length; for (int i = 0; i < length; i++) { if (cbuf[i] == lookFor) { count++; } } return numChars; } public int read(char[] cbuf, int off, int len) throws IOException { int numChars = super.read(cbuf, off, len); int length = cbuf.length; for (int i = 0; i < length; i++) { if (cbuf[i] == lookFor) { count++; } } return numChars; } public void reset() throws IOException { super.reset(); count = 0; } public boolean markSupported() { return false; } public void mark(int readAheadLimit) throws IOException { throw new IOException("CountReader does not support the mark() operation."); } public int getCount() { return count; }}?? 快捷鍵說明
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