Home |
SCJP2 Study Notes |
Language Fundamentals |
|
Operators and Assignments |
|
Flow Control and Exceptions |
|
Declarations and Access Control |
|
Garbage Collection |
|
Overloading and Overriding |
|
Threads |
|
The java.lang Package |
|
The java.util Package |
|
The java.awt Package |
The java.io Package |
|
References |
|
Miscellaneous Notes |
|
Tips & Traps |
|
Mock Exams |
|
Case Studies |
|
SCJA Notes |
|
SCJD Notes |
|
Projects |
|
Favourite Links |
|
About |
Feedback |
The java.io Package - Data Input and Output
- DataInputStream and DataOutputStream, like all filters, must be attached to some other stream
- DataInputStream implements DataInput and has one ctor
DataInputStream(InputStream in)
- DataOutputStream implements DataOutput has one ctor
DataOutputStream(OutputStream out)
and one field written which contains the number of bytes written.
Note: if this overflows it is set to Integer.MAX_VALUE. - DataInputStream has specialized read() methods, and DataOutputStream, specialized write() methods to handle the various primitive types and UTF-8 characters
| DataInputStream Methods | DataOutputStream Methods |
| write(int oneByte) | |
| read(byte[] buf) read(byte[] buf, int offset, int count) |
write(byte[] buf) write(byte[] buf, int offset, int count) |
| readBoolean() | writeBoolean(boolean b) |
| readByte() | writeByte(int val) |
| writeBytes(String str) | |
| readChar() | writeChar(int val) |
| writeChars(String str) | |
| readDouble() | writeDouble(double val) |
| readFloat() | writeFloat(float val) |
| readFully(byte[] buf) readFully(byte[] buf, int offset, int count) |
|
| readInt() | writeInt(int val) |
| readLine() | |
| readLong() | writeLong(long val) |
| readShort() | writeShort(int val) |
| readUnsignedByte() | |
| readUnsignedShort() | |
| readUTF() | writeUTF(String str) |
| skipBytes() | |
|
Items in red are deprecated. All the methods throw IOException | |
