Java Utililty Methods DataOutputStream Write String

void writeString(DataOutputStream buf, String value)
write String

if (value.contains("0円")) {
 throw new IllegalArgumentException("Null characters are not allowed in null-terminated strings.");
buf.writeBytes(value);
buf.writeByte((byte) 0);

void writeString(DataOutputStream os, String s)
write String to DataOutputStream motivation: DataInputStream.readUTF can't print lines larger than USHORTMAX

if (s == null) {
 os.writeInt(-1);
} else {
 byte array[] = s.getBytes();
 os.writeInt(array.length);
 os.write(array);

void writeString(DataOutputStream os, String str)
Writes string into DataOutputStream.

if (str != null) {
 os.writeInt(str.length());
 os.writeChars(str);
} else {
 os.writeInt(0);

void writeString(DataOutputStream out, String s)
write String

boolean isNull = s == null;
out.writeBoolean(isNull);
if (!isNull) {
 out.writeUTF(s);

void writeString(DataOutputStream out, String str)
Writes a string to the buffer.

int len = str.length();
if (len >= 65536) {
 throw new IllegalArgumentException("String too long.");
out.writeShort(len);
for (int i = 0; i < len; ++i) {
 out.writeChar(str.charAt(i));

void writeString(DataOutputStream out, String str)
write String

byte[] b = str.getBytes();
out.writeInt(b.length);
out.write(b);

void writeString(DataOutputStream out, String str)
Writes a string to a DataInputStream.

out.writeShort(str.length());
for (char letter : str.toCharArray()) {
 out.writeChar(letter);

void writeString(DataOutputStream out, String text)
Writes a string to the given output stream and emits an additional short to transfer if text is null.

if (null == text) {
 out.writeShort(0);
} else {
 out.writeShort(1);
 out.writeUTF(text);

void writeString(DataOutputStream out, String theString)
Write a string.

if (theString == null) {
 out.writeInt(-1);
} else {
 int len = theString.length();
 out.writeInt(len);
 writeCharsOfString(out, theString);

void writeString(DataOutputStream out, String val)
write String

out.writeUTF(val);