3rd Chapter input and output

3.1 Bufferedinputstream Class--buffered byte input stream 125

Construction method of--bufferedinputstream class for 3.1.1 Construction method 125
3.1.2 Available Method--Returns the estimated number of bytes that can be read 125
3.1.3 Close Method--closes this input stream and frees all associated system resources 126
3.1.4 Mark Method--record where the current pointer is located 126
3.1.5 Marksupported Method--Test whether the mark () method and Reset () method 127 are supported
3.1.6 Read Method--reading data from the input stream 128
3.1.7 Reset Method--reposition input stream 129
3.1.8 Skip Method-skips and discards data of the specified number of bytes 129
3.2 Bufferedoutputstream Class--buffered byte output stream 130
Construction method of--bufferedoutputstream class for 3.2.1 Construction method 130
3.2.2 Flush Method-refreshes this buffered output stream 131
3.2.3 Write Method--writes data to the output stream 131
3.3 BufferedReader Class--buffered character input stream 133
Construction method of--bufferedreader class for 3.3.1 construction method 133
3.3.2 Close Method--closes the stream and frees all resources associated with it 133
3.3.3 Mark Method--record where the current reading pointer is located 134
3.3.4 Marksupported Method--Determines whether the specified stream supports the mark () Operation 134
3.3.5 Read Method--reads the characters from the buffered input stream 135
3.3.6 ReadLine Method--reading a line of text 136
3.3.7 Ready Method--determine if this stream is prepared to be read 137
3.3.8 Reset Method--Reposition pointer 137
3.3.9 Skip Method-Skips a specified number of characters 138

3.4 BufferedWriter Class--buffered character output stream 138

Construction method of--bufferedwriter class for 3.4.1 construction method 139
3.4.2 Close Method--close stream 139
3.4.3 Flush Method--Flush buffer 139
3.4.4 NewLine Method--write a row delimiter 140
3.4.5 Write Method--writes data to the buffer 141

3.5 DataInputStream Class--Data input stream 142

3.5.1 Read Method--Reads a certain number of bytes 143
3.5.2 ReadByte Method--Read Byte 145 required for this operation
3.5.3 Readboolean Method--Reads a Boolean value 145
3.5.4 Readchar Method--read the characters required for this operation 145
3.5.5 Readdouble Method--Reads a double value of 146
3.5.6 Readfloat Method--Reads a float value of 146
3.5.7 Readfully Method--read some bytes 147
3.5.8 Readint Method--Reads an int value of 148
3.5.9 Readlong Method--Reads a Long value of 149
3.5.10 Readshort Method--Reads a short value of 149
3.5.11 Readunsignedbyte Method--Read unsigned byte value 149
3.5.12 Readunsignedshort Method--read unsigned short value 150
3.5.13 readUTF Method--Reads the UTF-8 encoded string 150
3.5.14 Skipbytes Method--skips n bytes of data in an input stream 152

3.6 DataOutputStream Class--Data output stream 153

3.6.1 Flush Method--empty this data output stream 153
3.6.2 Size Method--Returns the current value of counter written 154
3.6.3 Write Method (Stream output method) 155
3.6.4 Writeboolean Method-Writes a Boolean value to the output stream 156
3.6.5 WriteByte Method-Writes a byte value to the output stream 156
3.6.6 Writebytes Method-Writes the low-byte contents of each character in a string to the output stream 157
3.6.7 Writechar Method-Writes a char value to the output stream 157
3.6.8 WriteChars Method-Writes the string each char value to the output stream 158
3.6.9 Writedouble Method-Writes a double value to the output stream 158
3.6.10 Writefloat Method--Writes the float value to the output stream 159
3.6.11 Writelong Method-Writes a long value to the output stream 160
3.6.12 Writeshort Method-Writes a short value to the output stream 160
3.6.13 writeUTF () Method--writes UTF-8 encoded characters to the output stream 161

3.7 File Class--Files class 161

Construction method of--file class for 3.7.1 construction method 161
3.7.2 constant of--file class 162
3.7.3 CanExecute Method--Interpreting whether a file is executable 162
3.7.4 CanRead Method--Determine if the file is readable 162
3.7.5 CanWrite Method--Determine if the file can be written 163
3.7.6 CompareTo Method--Compare File Object 163
3.7.7 CreateNewFile Method--Create a new file 164
3.7.8 Createtempfile Method--Create temporary file 164
3.7.9 Delete Method--Deleting a file 167
3.7.10 Deleteonexit Method--Request to delete a file when the virtual machine terminates 167
3.7.11 Equals Method--determine if the file object is equal 168
3.7.12 exists Method--determine if the file exists 168
3.7.13 Getabsolutefile Method--Gets the absolute path of the file object 169
3.7.14 GetAbsolutePath Method--Gets the absolute path of the string object 169
3.7.15 Getcanonicalfile Method-Returns the canonical form of this abstract path name 170
3.7.16 Getcanonicalpath Method--Returns the canonical pathname string for this abstract path name 170
3.7.17 Getfreespace Method--Get the remaining space 171
3.7.18 GetName Method--Get file name 172
3.7.19 GetParent Method--Gets the string of the upper-level path 172
3.7.20 Getparentfile Method--Get the file object of the previous level path 173
3.7.21 GetPath Method--Get path string 173
3.7.22 Gettotalspace Method--Get total space size 173
3.7.23 Getusablespace Method--accurate acquisition of writable space size 174
3.7.24 Hashcode Method-generates a hash code for the file object 174
3.7.25 Isabsolute Method--Test whether this pathname is an absolute pathname 175
3.7.26 Isdirectory Method--Determine if the file object is a directory 175
3.7.27 Isfile Method--Determine if the file object is a document 176
3.7.28 Ishidden Method--Determining whether a file object sets a hidden property 176
3.7.29 LastModified Method--Get last modified 177
3.7.30 Length Method--Get file Lengths 177
3.7.31 List Method--Get a string array of directory listings 178
3.7.32 Listfiles Method--Get the file array of directory list 179
3.7.33 Listroots Method--Get the file array of the root directory 181
3.7.34 MkDir Method--Creating a directory 182
3.7.35 Mkdirs Method--Create full path for all directories 183
3.7.36 Renameto Method--Renaming a file or folder 183
3.7.37 Setexecutable Method--Setting the executable property 184
3.7.38 Setlastmodified Method--Set last modified 185
3.7.39 Setreadable Method--Setting the readable attribute 185
3.7.40 Setreadonly Method--Set read-only property 187
3.7.41 Setwritable Method--Setting writable properties 187
3.7.42 tostring Method--file string Format 188
3.7.43 Touri Method--Get the URI of file 189

3.8 FileInputStream Class--file byte input stream 189

Construction method of--fileinputstream class for 3.8.1 construction method 189
3.8.2 Available Method--get a readable number of valid bytes 189
3.8.3 Close Method--closing the file input stream 190
3.8.4 Finalize Method-closes the input stream when destroying an object 191
3.8.5 Getchannel Method--Returns the only FileChannel object associated with this file input stream 191
3.8.6 getFD Method--Gets the FileDescriptor object connected to the file object 191
3.8.7 Read Method--reading an array from a file byte stream 192
3.8.8 Skip Method--skips and discards n bytes 193

3.9 FileOutputStream Class--file byte output stream 194

Construction method of--fileoutputstream class for 3.9.1 construction method 194
3.9.2 Close Method--Closes the file output stream and frees up resources 195
3.9.3 Finalize Method--turn off output stream when stream is destroyed 195
3.9.4 Getchannel Method--Gets the FileChannel object of the output stream 195
3.9.5 getFD Method--Gets the FileDescriptor object connected to the file object 196
3.9.6 Write Method--writes data to the file output stream 196

3.10 FileReader Class--character input stream of a file 199

Construction method of--filereader class for 3.10.1 construction method 199
3.10.2 Close Method--close character input stream 200
3.10.3 Read Method--reading character data 200

3.11 FileWriter Class--character output stream of the file 202

Construction method of--filewriter class for 3.11.1 construction method 202
3.11.2 Close Method--close character output stream 202
3.11.3 Flush Method--Flush Buffer 203
3.11.4 Write Method-writes data to a character output stream 203

3.12 InputStream Class--byte input stream 205

3.12.1 available Method--Get a valid number of readable bytes 205
3.12.2 Close Method--close input stream 206
3.12.3 Mark Method--mark the current position in this input stream 206
3.12.4 marksupported Method--determining whether to support mark and reset method 207
3.12.5 Read Method--reads data from a byte input stream 207
3.12.6 Reset Method-Position 209 when repositioning to the last mark () method
3.12.7 Skip Method--skips and discards n bytes 209

3.13 OutputStream Class--byte output stream 210

3.13.1 Close Method--close byte output stream 210
3.13.2 Flush Method--Flush Buffer 211
3.13.3 Write Method-writes data to the output stream 211

3.14 ObjectOutputStream Class--Object output stream 213

Construction method of--objectoutputstream class for 3.14.1 construction method 213
3.14.2 Close Method--close object output stream 213
3.14.3 Flush Method--Flush Buffer 214
3.14.4 WriteObject Method-Writes an object to the output stream 214
3.14.5 Writebytes Method--writing a string to the output stream 215
3.14.6 Write Method-writes a byte value to the output stream 215
3.14.7 Writechar Method-Writes a char value 216 to the output stream
3.14.8 WriteChars Method-Writes a string value to the output stream 217
3.14.9 Writedouble Method-Writes a double value 217 to the output stream
3.14.10 Writefields Method--Writes a buffered field to the stream 217
3.14.11 Writefloat Method-Writes a float value to the output stream 218
3.14.12 Writeint Method-writes an int value to the output stream 218
3.14.13 Writelong Method-Writes a long value to the output stream 219
3.14.14 Writeshort Method-Writes a short value to the output stream 219
3.14.15 writeUTF Method-Writes a float value to the output stream 219

3.15 ObjectInputStream Class--Object input stream 220

Construction method of--objectinputstream class for 3.15.1 construction method 220
3.15.2 ReadObject Method--Reading an object from an input stream 220
3.15.3 Readint Method--reading an int value from an input stream 221
3.15.4 Readfloat Method--Reads float value from input stream 221
3.15.5 Readchar Method-Reads a char value from the input stream 222

3.16 Randomaccessfile Class--Random file Access Class 222

Construction method of--randomaccessfile class for 3.16.1 construction method 222
3.16.2 Close Method--Turn off data flow 222
3.16.3 Getchannel Method--Returns the FileChannel object of this file 223
3.16.4 getFD Method--Returns the opaque file descriptor object for this stream 223
3.16.5 Getfilepointer Method--Returns the current offset in the file 224
3.16.6 Length Method--Returns the duration of this file 224
3.16.7 Read Method--Reads a data byte 225
3.16.8 Readboolean Method--Reads a Boolean value from a file 227
3.16.9 ReadByte Method--Reads a byte value from a file 228
3.16.10 Readint Method--Reads an int value from a file 228
3.16.11 Readchar Method--Reads a char value from a file 229
3.16.12 Readdouble Method--Reads a double value from a file 229
3.16.13 Readfloat Method--Reads a float value from a file 230
3.16.14 Readfully Method--Reads a byte array from a file 230
3.16.15 ReadLine Method--Reads the next line of text from this file 232
3.16.16 Readlong Method--Reads a long value from a file 232
3.16.17 Readshort Method--Reads a short value from a file 233
3.16.18 Readunsignedbyte Method-Read unsigned byte value from file 234
3.16.19 Readunsignedshort Method--read unsigned short value from file 234
3.16.20 readUTF Method-Reads a UTF-8 string from this file 235
3.16.21 SetLength Method--Set the length of this file 235
3.16.22 Seek Method--Move the file pointer to the specified position 236
3.16.23 Skipbytes Method--Skip and discard n bytes 236
3.16.24 Write Method-writes the specified byte 237 to this file
3.16.25 Writeboolean Method--Writes a Boolean to the file 239
3.16.26 WriteByte Method-Writes a byte to the file 239
3.16.27 Writebytes Method--Writes the string to the file by byte sequence 240
3.16.28 WriteChars Method--Writes a string as character data 240
3.16.29 Writedouble Method--write Double value 241
3.16.30 Writefloat Method--Write to file float value 241
3.16.31 Writeint Method-Write int value to file 242
3.16.32 Writelong Method-Writes a long value to a file 242
3.16.33 Writeshort Method--Writes a short value of 243 to a file
3.16.34 writeUTF Method--writing a UTF-8 encoded string to a file 243

3.17 Reader Class--abstract class for reading stream of characters 244

3.17.1 Close Method--close stream 244
3.17.2 Mark Method--marks the current position in the stream 244
3.17.3 marksupported Method--determine if the mark () operation is supported 245
3.17.4 Read Method--reading data from a stream 245
3.17.5 Ready Method--determining whether to read this stream 247
3.17.6 Reset Method--Reset the stream 248
3.17.7 Skip Method--skips and discards n bytes 248

3.18 Scanner Class--Simple text scanner 249

Construction method of--scanner class for 3.18.1 construction method 249
3.18.2 Close Method--close the scanner 250
3.18.3 Delimiter Method--Returns the Pattern 250 that matches the delimiter
3.18.4 Findinline Method--Ignore delimiter to find the next construction mode 250
3.18.5 Findwithinhorizon Method--try to find the next specified pattern 251
3.18.6 Hasnext Method--whether there is another marker in the input of the scanner 252
3.18.7 Hasnextbigdecimal Method--whether the next token is a BigDecimal in the default cardinality 254
3.18.8 Hasnextbiginteger Method--whether the next token is a BigInteger in the default cardinality 254
3.18.9 Hasnextboolean Method--whether the next token is a Boolean value 255
3.18.10 Hasnextbyte Method--whether the next token is a byte value 256
3.18.11 Hasnextdouble Method--whether the next token is a double value 256
3.18.12 Hasnextfloat Method--whether the next tag is a float value of 257
3.18.13 Hasnextint Method--whether the next tag is an int value 257
3.18.14 Hasnextline Method--whether the next line exists 258
3.18.15 Hasnextlong Method--whether the next token is a Long value 259
3.18.16 Hasnextshort Method--whether the next token is a short value of 260
3.18.17 IOException Method--the last thrown IOException 260
3.18.18 Locale Method-Returns the locale of this scanner 261
3.18.19 Match Method--matching result of the last scan operation 261
3.18.20 Next Method--read the next full tag 262
3.18.21 Nextbigdecimal Method--Reads the next BigDecimal object 263
3.18.22 Nextbiginteger Method--Reads the next BigInteger object 264
3.18.23 Nextboolean Method--Reads the next Boolean value 265
3.18.24 Nextbyte Method--Reads the next byte value 266
3.18.25 Nextdouble Method--Reads the next double value 267
3.18.26 Nextfloat Method--Reads the next float value 267
3.18.27 Nextint Method--Reads the next int value 268
3.18.28 Nextline Method--Reads the next line of text 269
3.18.29 Nextlong Method--Reads the next Long value 269
3.18.30 Nextshort Method--Reads the next short value 270
3.18.31 Radix Method--Returns the default cardinality of the scanner 271
3.18.32 Reset Method--Reset Scanner 271
3.18.33 Skip Method--Ignore delimiter skip matching input information 272
3.18.34 ToString Method--Returns the string representation of this Scanner 273
3.18.35 Usedelimiter Method--set to specify delimited mode 273
3.18.36 Uselocale Method--set to the specified locale 274
3.18.37 Useradix Method--setting the specified cardinality 274

3.19 Writer class--abstract class for writing stream of characters 275

3.19.1 Append Method--Add the specified character 275
3.19.2 Close Method--Turn off data flow 275
3.19.3 Flush Method--refreshes the buffer of the stream 276
3.19.4 Write Method-writes data to the character output stream 276

3rd Chapter input and output