Here you can find the source of writeString(final String string, final DataOutput out)
public static void writeString(final String string, final DataOutput out) throws IOException
//package com.java2s; /*/*from www .jav a2 s . co m*/ * Cacheonix Systems licenses this file to You under the LGPL 2.1 * (the "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.cacheonix.org/products/cacheonix/license-lgpl-2.1.htm * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.DataOutput; import java.io.DataOutputStream; import java.io.IOException; public class Main { public static void writeString(final String string, final DataOutput out) throws IOException { if (string == null) { out.writeBoolean(true); } else { out.writeBoolean(false); out.writeUTF(string); } } public static void writeBoolean(final DataOutputStream out, final Boolean aBoolean) throws IOException { if (aBoolean == null) { out.writeBoolean(true); } else { out.writeBoolean(false); out.writeBoolean(aBoolean.booleanValue()); } } }