java io

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InputStream抽象类

public abstract class InputStream implements Closeable

常量：

private static final int MAX_SKIP_BUFFER_SIZE = 2048;

方法：

一：public abstract int read() throws IOException;

二： public int read(byte b[]) throws IOException {return read(b, 0, b.length);}

三： public int read(byte b[], int off, int len) throws IOException {........}

四： public long skip(long n) throws IOException {.......}

五： public int available() throws IOException {return 0;}

六： public void close() throws IOException {}

七：public synchronized void mark(int readlimit) {}

八： public synchronized void reset() throws IOException { throw new IOException("mark/reset not supported");}

九：public boolean markSupported() {eturn false;}

类FilterInputStream：

public class FilterInputStream extends InputStream

属性：

protected volatile InputStream in;

构造方法：

protected FilterInputStream(InputStream in) {this.in = in;}

方法：

继承于InputStream，直接调用in的相应方法

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