主要接口

DataOutput

public interface DataOutput {

    void write(int b) throws IOException;

    void write(byte b[]) throws IOException;

    void write(byte b[], int off, int len) throws IOException;

    void writeBoolean(boolean v) throws IOException;

    void writeByte(int v) throws IOException;

    void writeShort(int v) throws IOException;

    void writeChar(int v) throws IOException;

    void writeInt(int v) throws IOException;

    void writeLong(long v) throws IOException;

    void writeFloat(float v) throws IOException;

    void writeDouble(double v) throws IOException;

    void writeBytes(String s) throws IOException;

    void writeChars(String s) throws IOException;

    void writeUTF(String s) throws IOException;
}

DataInput

public interface DataInput {

    void readFully(byte b[]) throws IOException;

    void readFully(byte b[], int off, int len) throws IOException;

    int skipBytes(int n) throws IOException;

    boolean readBoolean() throws IOException;

    byte readByte() throws IOException;

    int readUnsignedByte() throws IOException;

    short readShort() throws IOException;

    int readUnsignedShort() throws IOException;

    char readChar() throws IOException;

    int readInt() throws IOException;

    long readLong() throws IOException;

    float readFloat() throws IOException;

    double readDouble() throws IOException;

    String readLine() throws IOException;

    String readUTF() throws IOException;
}