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MID Profile: Interface DataOutput
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java.io</FONT>
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Interface DataOutput</H2>
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<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../javax/microedition/io/Datagram.html">Datagram</A></DD>
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<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../java/io/DataOutputStream.html">DataOutputStream</A></DD>
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<DT>public interface <B>DataOutput</B></DL>
<P>
The <code>DataOutput</code> interface provides for converting data from any of the Java primitive types to a series of bytes and writing these bytes to a binary stream. There is also a facility for converting a <code>String</code> into Java modified UTF-8 format and writing the resulting series of bytes. <p> For all the methods in this interface that write bytes, it is generally true that if a byte cannot be written for any reason, an <code>IOException</code> is thrown.
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<DT><B>Since: </B><DD>JDK1.0, CLDC 1.0</DD>
<DT><B>See Also: </B><DD><A HREF="../../java/io/DataInput.html"><CODE>DataInput</CODE></A>,
<A HREF="../../java/io/DataOutputStream.html"><CODE>DataOutputStream</CODE></A></DL>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/io/DataOutput.html#write(byte[])">write</A></B>(byte[] b)</CODE>
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Writes to the output stream all the bytes in array <code>b</code>.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/io/DataOutput.html#write(byte[], int, int)">write</A></B>(byte[] b, int off, int len)</CODE>
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Writes <code>len</code> bytes from array <code>b</code>, in order, to the output stream.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/io/DataOutput.html#write(int)">write</A></B>(int b)</CODE>
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Writes to the output stream the eight low-order bits of the argument <code>b</code>.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/io/DataOutput.html#writeBoolean(boolean)">writeBoolean</A></B>(boolean v)</CODE>
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Writes a <code>boolean</code> value to this output stream.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/io/DataOutput.html#writeByte(int)">writeByte</A></B>(int v)</CODE>
<BR>
Writes to the output stream the eight low- order bits of the argument <code>v</code>.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/io/DataOutput.html#writeChar(int)">writeChar</A></B>(int v)</CODE>
<BR>
Writes a <code>char</code> value, which is comprised of two bytes, to the output stream.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/io/DataOutput.html#writeChars(java.lang.String)">writeChars</A></B>(<A HREF="../../java/lang/String.html">String</A> s)</CODE>
<BR>
Writes every character in the string <code>s</code>, to the output stream, in order, two bytes per character.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/io/DataOutput.html#writeInt(int)">writeInt</A></B>(int v)</CODE>
<BR>
Writes an <code>int</code> value, which is comprised of four bytes, to the output stream.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/io/DataOutput.html#writeLong(long)">writeLong</A></B>(long v)</CODE>
<BR>
Writes an <code>long</code> value, which is comprised of four bytes, to the output stream.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/io/DataOutput.html#writeShort(int)">writeShort</A></B>(int v)</CODE>
<BR>
Writes two bytes to the output stream to represent the value of the argument.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/io/DataOutput.html#writeUTF(java.lang.String)">writeUTF</A></B>(<A HREF="../../java/lang/String.html">String</A> str)</CODE>
<BR>
Writes two bytes of length information to the output stream, followed by the Java modified UTF representation of every character in the string <code>s</code>.</TD>
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<A NAME="write(int)"><!-- --></A><H3>
write</H3>
<PRE>
public void <B>write</B>(int b) throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Writes to the output stream the eight low-order bits of the argument <code>b</code>. The 24 high-order bits of <code>b</code> are ignored.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>b</CODE> - the byte to be written.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/io/IOException.html">IOException</A></CODE> - if an I/O error occurs.</DL>
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<A NAME="write(byte[])"><!-- --></A><H3>
write</H3>
<PRE>
public void <B>write</B>(byte[] b) throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Writes to the output stream all the bytes in array <code>b</code>. If <code>b</code> is <code>null</code>, a <code>NullPointerException</code> is thrown. If <code>b.length</code> is zero, then no bytes are written. Otherwise, the byte <code>b[0]</code> is written first, then <code>b[1]</code>, and so on; the last byte written is <code>b[b.length-1]</code>.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>b</CODE> - the data.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/io/IOException.html">IOException</A></CODE> - if an I/O error occurs.</DL>
</DD>
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<A NAME="write(byte[], int, int)"><!-- --></A><H3>
write</H3>
<PRE>
public void <B>write</B>(byte[] b, int off, int len) throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Writes <code>len</code> bytes from array <code>b</code>, in order, to the output stream. If <code>b</code> is <code>null</code>, a <code>NullPointerException</code> is thrown. If <code>off</code> is negative, or <code>len</code> is negative, or <code>off+len</code> is greater than the length of the array <code>b</code>, then an <code>IndexOutOfBoundsException</code>⌨️ 快捷键说明
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