J2ME in a Nutshell phần 4 pot

... 6.3.1 Sending a Datagram To send a datagram, you have to obtain a Datagram object, populate it with the data to be sent, and invoke the send( ) method. The DatagramConnection interface has four ... following pair of repaint( ) calls: repaint(0, 0, 4, 4) ; // Repaint the old location of the block repaint (4, 4, 4, 4) ; // Repaint the new location of the block When several rep...

Ngày tải lên: 12/08/2014, 19:21

... display) a Canvas from which the attribute values are obtained, as shown in Example 5-1. Example 5-1. Getting Display and Canvas Attributes for a Device package ora.ch5; import javax.microedition.lcdui.Canvas; ... without having to wait for the paint( ) method to be called. 5 .4. 1 Lines and Rectangles The simplest shape you can draw on a Canvas is a straight line: public...

Ngày tải lên: 12/08/2014, 19:21

... packages are provided: java.io (but not LineNumberInputStream and StringBufferInputStream, which are deprecated in J2SE) java.lang java.lang.ref java.lang.reflect java.math java.net java.security ... java.security.acl java.security.cert java.security.interfaces java.security.spec java.text java.util java.util.jar java.util.zip J2ME in a Nutshell 221 Figure 6-5. A...

Ngày tải lên: 12/08/2014, 19:21

... the information and what type of data is stored there. A reference is a scalar and can be used anywhere a scalar can be used. Any array element or hash value can contain a reference (a hash key ... packages. Each package starts with a package declaration. The package call takes one argument, the name of the package. Within the scope of a package declaration, all regular identifie...

Ngày tải lên: 12/08/2014, 21:21

... O'Reilly at http://java.oreilly.com/. Books that are of particular interest to J2ME programmers include: Java in a Nutshell, by David Flanagan A Java language tutorial and complete API ... Package Contents 308 308 309 310 11. java.io Package java.io ByteArrayInputStream ByteArrayOutputStream DataInput DataInputStream DataOutput DataOutputStream EOFException...

Ngày tải lên: 12/08/2014, 19:21

... server) 9 04 JAR size mismatch 905 Attribute mismatch 906 Invalid descriptor J2ME in a Nutshell 54 Table 3-2. MIDlet Packaging Attributes Attribute Name JAR JAD Value and Meaning MIDlet-Name ... therefore share the same instances of all Java classes and other resources loaded into the Java VM. Among other things, this means that data can be shared between MIDlets, and the...

Ngày tải lên: 12/08/2014, 19:21

... right- clicking on the page in the browser, selecting Properties and then Certificate, and finally activating the Certification Path tab of the dialog that appears, as shown in Figure 9 -4. As you can ... and return values. Inner classes Groups all of the inner classes and interfaces defined by the class or interface. For each inner class, there is a single-line synopsis. Each inne...

Ngày tải lên: 12/08/2014, 19:21

... } Subclasses ByteArrayInputStream, DataInputStream Passed To DataInputStream.DataInputStream(), InputStreamReader.InputStreamReader() Returned By Class.getResourceAsStream(), javax.microedition.io.Connector.openInputStream(), ... ByteArrayInputStream ByteArrayOutputStream CharArrayReader CharArrayWriter CharConversionException DataInput DataInputStream...

Ngày tải lên: 12/08/2014, 19:21

... created by applying the static valueOf() methods to a boolean, a char, an array of characters (char[]), an int, a long or an arbitrary Java Object. With an Object, the String is created using the ... Datagram newDatagram( int size) throws java.io.IOException; public abstract Datagram newDatagram(byte[] buf, int size) throws java.io.IOException; public abstract Datagram newData...

Ngày tải lên: 12/08/2014, 19:21

... javax.microedition.io DataInput: java.io DataInputStream: java.io DataOutput: java.io DataOutputStream: java.io Date: java.util DATE: Calendar, DateField DATE_TIME: DateField DateField: ... rec1 and rec2 is converted to DataInputStreams like this: DataInputStream dis1 = new DataInputStream(new ByteArrayInputStream(rec1)); DataInputStream dis2 = new DataInput...

Ngày tải lên: 12/08/2014, 19:21