public abstract interface DataInput {
    // Public Instance Methods
            public abstract boolean readBoolean() throws IOException;
            public abstract byte readByte() throws IOException;
            public abstract char readChar() throws IOException;
            public abstract double readDouble() throws IOException;
            public abstract float readFloat() throws IOException;
            public abstract void readFully(byte[] b) throws IOException;
            public abstract void readFully(byte[] b, int off, int len) throws IOException;
            public abstract int readInt() throws IOException;
            public abstract String readLine() throws IOException;
            public abstract long readLong() throws IOException;
            public abstract short readShort() throws IOException;
            public abstract String readUTF() throws IOException;
            public abstract int readUnsignedByte() throws IOException;
            public abstract int readUnsignedShort() throws IOException;
            public abstract int skipBytes(int n) throws IOException;
}