?? checkedinputstream.java
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import java.io.FilterInputStream;import java.io.InputStream;import java.io.IOException;public class CheckedInputStream extends FilterInputStream { private Checksum cksum; public CheckedInputStream(InputStream in, Checksum cksum) { super(in); this.cksum = cksum; } public int read() throws IOException { int b = in.read(); if (b != -1) { cksum.update(b); } return b; } public int read(byte[] b) throws IOException { int len; len = in.read(b, 0, b.length); if (len != -1) { cksum.update(b, 0, len); } return len; } public int read(byte[] b, int off, int len) throws IOException { len = in.read(b, off, len); if (len != -1) { cksum.update(b, off, len); } return len; } public Checksum getChecksum() { return cksum; }}?? 快捷鍵說明
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