下面列出了java.io.DataInputStream#readFloat ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
/**
* Initialize a Vectors instance from an open input stream. This method closes the stream.
*
* @param is
* the open stream
* @throws IOException
* if there are problems reading from the stream
*/
public Vectors(InputStream is) throws IOException {
DataInputStream dis = new DataInputStream(is);
int words = dis.readInt();
int size = dis.readInt();
this.size = size;
this.vectors = new float[words][];
this.vocabVects = new String[words];
for (int i = 0; i < words; i++) {
this.vocabVects[i] = dis.readUTF();
float[] vector = new float[size];
for (int j = 0; j < size; j++)
vector[j] = dis.readFloat();
this.vectors[i] = vector;
}
this.vocab = new HashMap<String, Integer>();
for (int i = 0; i < vocabVects.length; i++)
vocab.put(vocabVects[i], i);
dis.close();
}
public static boolean initialize(Alite alite, final DataInputStream dis) {
LocalScreen ls = new LocalScreen(alite);
try {
ls.zoomFactor = dis.readFloat();
ls.centerX = dis.readInt();
ls.centerY = dis.readInt();
ls.pendingZoomFactor = ls.zoomFactor;
ls.pendingCenterX = ls.centerX;
ls.pendingCenterY = ls.centerY;
} catch (Exception e) {
AliteLog.e("Local Screen Initialize", "Error in initializer.", e);
return false;
}
alite.setScreen(ls);
return true;
}
void loadManualCropping(final DataInputStream in, final boolean docPage, final boolean leftPage)
throws IOException {
final int index = in.readShort();
final SparseArrayEx<PageInfo> target = getPages(docPage, leftPage);
PageInfo pageInfo = target.get(index, null);
if (pageInfo == null) {
pageInfo = new PageInfo(index);
target.append(index, pageInfo);
}
pageInfo.manualCropping = new RectF(in.readFloat(), in.readFloat(), in.readFloat(), in.readFloat());
}
public static Object readTypeAndObj(DataInputStream in) throws IOException {
byte rtype = in.readByte();
switch (rtype) {
case TYPE_VOID:
return null;
case TYPE_BYTE:
return (byte) in.read();
case TYPE_BOOL:
return in.read() != 0;
case TYPE_WCHAR32:
return in.readInt();
case TYPE_INT:
return in.readInt();
case TYPE_SHORT:
return in.readShort();
case TYPE_LONG:
return in.readLong();
case TYPE_FLOAT:
return in.readFloat();
case TYPE_DOUBLE:
return in.readDouble();
case TYPE_IUTF8:
return readIStr(in);
case TYPE_IRAW:
return readIRaw(in);
case TYPE_TABLE:
return readTable(in);
case TYPE_ARRAY:
return readArray(in);
case TYPE_EOF:
throw new IOException("Unexpected type: TYPE_EOF");
default:
throw new IOException("Unexpected type:" + rtype + "\"");
}
}
void loadAutoCropping(final DataInputStream in, final boolean docPage, final boolean leftPage)
throws IOException {
final int index = in.readShort();
final SparseArrayEx<PageInfo> target = getPages(docPage, leftPage);
PageInfo pageInfo = target.get(index, null);
if (pageInfo == null) {
pageInfo = new PageInfo(index);
target.append(index, pageInfo);
}
pageInfo.autoCropping = new RectF(in.readFloat(), in.readFloat(), in.readFloat(), in.readFloat());
}
@SuppressWarnings("rawtypes")
private static Object readObjectFromStream(DataInputStream data, Class curClass) throws IOException
{
if (curClass.equals(Boolean.class))
{
return data.readBoolean();
}
else if (curClass.equals(Byte.class))
{
return data.readByte();
}
else if (curClass.equals(Integer.class))
{
return data.readInt();
}
else if (curClass.equals(String.class))
{
return data.readUTF();
}
else if (curClass.equals(Double.class))
{
return data.readDouble();
}
else if (curClass.equals(Float.class))
{
return data.readFloat();
}
else if (curClass.equals(Long.class))
{
return data.readLong();
}
else if (curClass.equals(Short.class))
{
return data.readShort();
}
return null;
}
public static HyperspaceScreen createScreen(Alite alite, DataInputStream dis) throws IOException {
boolean intergal = dis.readBoolean();
HyperspaceScreen hs = new HyperspaceScreen(alite, intergal);
hs.counter = dis.readFloat();
hs.red = dis.readFloat();
hs.green = dis.readFloat();
hs.blue = dis.readFloat();
hs.increase = dis.readInt();
hs.restartedSound = dis.readBoolean();
hs.screenLoad = true;
return hs;
}
@Override
public void read(DataInputStream dai, boolean oldVersion) throws IOException {
int v=1;
if(!oldVersion) v=dai.readInt();
if(v==1){
health = dai.readLong();
utcA1 = dai.readDouble();
utcA0 = dai.readDouble();
utcTOW = dai.readLong();
utcWNT = dai.readInt();
utcLS = dai.readInt();
utcWNF = dai.readInt();
utcDN = dai.readInt();
utcLSF = dai.readInt();
for(int i=0;i<alpha.length;i++){
alpha[i] = dai.readFloat();
}
for(int i=0;i<beta.length;i++){
beta[i] = dai.readFloat();
}
validHealth = dai.readBoolean();
validUTC = dai.readBoolean();
validKlobuchar = dai.readBoolean();
long l = dai.readLong();
refTime = new Time(l>0?l:System.currentTimeMillis());
}else{
throw new IOException("Unknown format version:"+v);
}
}
@Override
public void read(DataInputStream dai, boolean oldVersion) throws IOException {
int v=1;
if(!oldVersion) v=dai.readInt();
if(v==1){
health = dai.readLong();
utcA1 = dai.readDouble();
utcA0 = dai.readDouble();
utcTOW = dai.readLong();
utcWNT = dai.readInt();
utcLS = dai.readInt();
utcWNF = dai.readInt();
utcDN = dai.readInt();
utcLSF = dai.readInt();
for(int i=0;i<alpha.length;i++){
alpha[i] = dai.readFloat();
}
for(int i=0;i<beta.length;i++){
beta[i] = dai.readFloat();
}
validHealth = dai.readBoolean();
validUTC = dai.readBoolean();
validKlobuchar = dai.readBoolean();
long l = dai.readLong();
refTime = new Time(l>0?l:System.currentTimeMillis());
}else{
throw new IOException("Unknown format version:"+v);
}
}
@Override
public float getFloatAt(long o) throws ConfusedCFRException {
DataInputStream dis = rawDataAsStream((int) o, 8);
try {
return dis.readFloat();
} catch (Exception e) {
throw new ConfusedCFRException(e);
}
}
/**
* @param args
* the input C vectors file, output Java vectors file
*/
public static void main(String[] args) throws VectorsException, IOException {
float[][] vectors;
String[] vocabVects;
int words;
int size;
File vectorFile = new File(args[0]);
File outputFile = new File(args[1]);
double len;
if (!vectorFile.exists())
throw new VectorsException("Vectors file not found");
FileInputStream fis = new FileInputStream(vectorFile);
StringBuilder sb = new StringBuilder();
char ch = (char) fis.read();
while (ch != '\n') {
sb.append(ch);
ch = (char) fis.read();
}
String line = sb.toString();
String[] parts = line.split("\\s+");
words = (int) Long.parseLong(parts[0]);
size = (int) Long.parseLong(parts[1]);
vectors = new float[words][];
vocabVects = new String[words];
System.out.println("" + words + " words with size " + size + " per vector.");
byte[] orig = new byte[4];
byte[] buf = new byte[4];
for (int w = 0; w < words; w++) {
if (w % (words / 10) == 0) {
System.out.println("Read " + w + " words");
}
sb.setLength(0);
ch = (char) fis.read();
while (!Character.isWhitespace(ch) && ch >= 0 && ch <= 256) {
sb.append((char) ch);
ch = (char) fis.read();
}
ch = (char) fis.read();
String st = sb.toString();
vocabVects[w] = st;
float[] m = new float[size];
for (int i = 0; i < size; i++) {
// read a little endian floating point number and interpret it as a big endian one, see
// http://stackoverflow.com/questions/2782725/converting-float-values-from-big-endian-to-little-endian/2782742#2782742
// NB: this code assumes amd64 architecture
for (int j = 0; j < 4; j++)
orig[j] = (byte) fis.read();
buf[2] = orig[0];
buf[1] = orig[1];
buf[0] = orig[2];
buf[3] = orig[3];
// this code can be made more efficient by reusing the ByteArrayInputStream
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(buf));
m[i] = dis.readFloat();
dis.close();
}
len = 0;
for (int i = 0; i < size; i++)
len += m[i] * m[i];
len = (float) Math.sqrt(len);
for (int i = 0; i < size; i++)
m[i] /= len;
vectors[w] = m;
}
fis.close();
FileOutputStream fos = new FileOutputStream(outputFile);
Vectors instance = new Vectors(vectors, vocabVects);
instance.writeTo(fos);
}
/**
* Parse the GOTO bytecode.
*/
@Override
public void parseQuotientByteCode(Vertex state, DataInputStream dataStream, Network network) throws IOException {
float correctness = dataStream.readFloat();
long id = dataStream.readLong();
if (id == 0) {
return;
}
Object[] result = new Object[3];
result[0] = id;
parseArgumentByteCode(result, dataStream, null, network);
id = (Long)result[0];
Vertex element = (Vertex)result[2];
if (element == null) {
return;
}
Relationship relationship = state.addWeakRelationship(Primitive.QUOTIENT, element, correctness);
if (id == 0) {
return;
}
result[0] = id;
result[1] = null;
result[2] = null;
parseArgumentByteCode(result, dataStream, null, network);
id = (Long)result[0];
element = (Vertex)result[2];
if (element == null) {
return;
}
if (element.is(Primitive.PREVIOUS)) {
Vertex meta = network.createTemporyVertex();
relationship.setMeta(meta);
while (id > 0) {
result[0] = id;
result[1] = null;
result[2] = null;
parseArgumentByteCode(result, dataStream, null, network);
id = (Long)result[0];
element = (Vertex)result[2];
if (element != null) {
if (element.is(Primitive.NOT)) {
if (id == 0) {
return;
}
result[0] = id;
result[1] = null;
result[2] = null;
parseArgumentByteCode(result, dataStream, null, network);
id = (Long)result[0];
element = (Vertex)result[2];
if (element == null) {
continue;
}
meta.removeRelationship(Primitive.PREVIOUS, element);
} else {
meta.addRelationship(Primitive.PREVIOUS, element);
}
}
}
}
}
public FloatInfo(DataInputStream in, int index) throws IOException
{
super(index);
value = in.readFloat();
}
@Override
void loadSVGRatios(DataInputStream input) throws IOException {
ratioW = input.readFloat();
ratioH = input.readFloat();
}
/**
* Constructor
*/
BinaryConstantPool(DataInputStream in) throws IOException {
// JVM 4.1 ClassFile.constant_pool_count
types = new byte[in.readUnsignedShort()];
cpool = new Object[types.length];
for (int i = 1 ; i < cpool.length ; i++) {
int j = i;
// JVM 4.4 cp_info.tag
switch(types[i] = in.readByte()) {
case CONSTANT_UTF8:
cpool[i] = in.readUTF();
break;
case CONSTANT_INTEGER:
cpool[i] = new Integer(in.readInt());
break;
case CONSTANT_FLOAT:
cpool[i] = new Float(in.readFloat());
break;
case CONSTANT_LONG:
cpool[i++] = new Long(in.readLong());
break;
case CONSTANT_DOUBLE:
cpool[i++] = new Double(in.readDouble());
break;
case CONSTANT_CLASS:
case CONSTANT_STRING:
// JVM 4.4.3 CONSTANT_String_info.string_index
// or JVM 4.4.1 CONSTANT_Class_info.name_index
cpool[i] = new Integer(in.readUnsignedShort());
break;
case CONSTANT_FIELD:
case CONSTANT_METHOD:
case CONSTANT_INTERFACEMETHOD:
case CONSTANT_NAMEANDTYPE:
// JVM 4.4.2 CONSTANT_*ref_info.class_index & name_and_type_index
cpool[i] = new Integer((in.readUnsignedShort() << 16) | in.readUnsignedShort());
break;
case CONSTANT_METHODHANDLE:
cpool[i] = readBytes(in, 3);
break;
case CONSTANT_METHODTYPE:
cpool[i] = readBytes(in, 2);
break;
case CONSTANT_INVOKEDYNAMIC:
cpool[i] = readBytes(in, 4);
break;
case 0:
default:
throw new ClassFormatError("invalid constant type: " + (int)types[i]);
}
}
}
public DHTNetworkPosition
deserialisePosition(
DataInputStream is )
throws IOException
{
float[] data = new float[4];
for (int i=0;i<data.length;i++){
data[i] = is.readFloat();
}
VivaldiPosition pos = VivaldiPositionFactory.createPosition();
pos.fromFloatArray( data );
return( pos );
}
public static float[] readFloat(int length, DataInputStream dis) throws IOException {
float[] ret = new float[length];
for (int i = 0; i < length; i++)
ret[i] = dis.readFloat();
return ret;
}
/**
* Parse the GOTO bytecode.
*/
public void parseQuotientByteCode(Vertex state, DataInputStream dataStream, Network network) throws IOException {
float correctness = dataStream.readFloat();
long id = dataStream.readLong();
if (id == 0) {
return;
}
Vertex element = network.findById(id);
if (element == null) {
return;
}
Relationship relationship = state.addWeakRelationship(Primitive.QUOTIENT, element, correctness);
id = dataStream.readLong();
if (id == 0) {
return;
}
element = network.findById(id);
if (element == null) {
return;
}
if (element.is(Primitive.PREVIOUS)) {
id = dataStream.readLong();
Vertex meta = network.createTemporyVertex();
relationship.setMeta(meta);
while (id > 0) {
element = network.findById(id);
if (element != null) {
if (element.is(Primitive.NOT)) {
id = dataStream.readLong();
if (id == 0) {
return;
}
element = network.findById(id);
if (element == null) {
continue;
}
meta.removeRelationship(Primitive.PREVIOUS, element);
} else {
meta.addRelationship(Primitive.PREVIOUS, element);
}
}
id = dataStream.readLong();
}
}
}
/**
* Constructor
*/
BinaryConstantPool(DataInputStream in) throws IOException {
// JVM 4.1 ClassFile.constant_pool_count
types = new byte[in.readUnsignedShort()];
cpool = new Object[types.length];
for (int i = 1 ; i < cpool.length ; i++) {
int j = i;
// JVM 4.4 cp_info.tag
switch(types[i] = in.readByte()) {
case CONSTANT_UTF8:
cpool[i] = in.readUTF();
break;
case CONSTANT_INTEGER:
cpool[i] = new Integer(in.readInt());
break;
case CONSTANT_FLOAT:
cpool[i] = new Float(in.readFloat());
break;
case CONSTANT_LONG:
cpool[i++] = new Long(in.readLong());
break;
case CONSTANT_DOUBLE:
cpool[i++] = new Double(in.readDouble());
break;
case CONSTANT_CLASS:
case CONSTANT_STRING:
// JVM 4.4.3 CONSTANT_String_info.string_index
// or JVM 4.4.1 CONSTANT_Class_info.name_index
cpool[i] = new Integer(in.readUnsignedShort());
break;
case CONSTANT_FIELD:
case CONSTANT_METHOD:
case CONSTANT_INTERFACEMETHOD:
case CONSTANT_NAMEANDTYPE:
// JVM 4.4.2 CONSTANT_*ref_info.class_index & name_and_type_index
cpool[i] = new Integer((in.readUnsignedShort() << 16) | in.readUnsignedShort());
break;
case CONSTANT_METHODHANDLE:
cpool[i] = readBytes(in, 3);
break;
case CONSTANT_METHODTYPE:
cpool[i] = readBytes(in, 2);
break;
case CONSTANT_INVOKEDYNAMIC:
cpool[i] = readBytes(in, 4);
break;
case 0:
default:
throw new ClassFormatError("invalid constant type: " + (int)types[i]);
}
}
}
public void readFromStream(DataInputStream in) throws IOException {
super.readFromStream(in);
int len = in.readInt();
nTrackedAllocObjects = new long[len];
for (int i = 0; i < len; i++) {
nTrackedAllocObjects[i] = in.readLong();
}
len = in.readInt();
nTrackedLiveObjects = new int[len];
for (int i = 0; i < len; i++) {
nTrackedLiveObjects[i] = in.readInt();
}
len = in.readInt();
maxSurvGen = new int[len];
for (int i = 0; i < len; i++) {
maxSurvGen[i] = in.readInt();
}
len = in.readInt();
trackedLiveObjectsSize = new long[len];
for (int i = 0; i < len; i++) {
trackedLiveObjectsSize[i] = in.readLong();
}
len = in.readInt();
avgObjectAge = new float[len];
for (int i = 0; i < len; i++) {
avgObjectAge[i] = in.readFloat();
}
nInstrClasses = in.readInt();
len = in.readInt();
nTotalAllocObjects = new int[len];
for (int i = 0; i < len; i++) {
nTotalAllocObjects[i] = in.readInt();
}
nTrackedItems = in.readInt();
maxValue = in.readLong();
nTotalTrackedBytes = in.readLong();
nTotalTracked = in.readInt();
currentEpoch = in.readInt();
}