Slide 3.19: Other interfaces   Slide 4.1: Programming Exercise I: my memento by using J2ME   Home

Other Interfaces (Cont.)

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final Alert soundAlert = new Alert( "sound Alert" );

• The class javax.microedition.lcdui.Alert is a screen that shows data to the user and waits for a certain period of time before proceeding to the next screen. An alert is an ordinary screen that can contain text (String) and image, and which handles events like other screens. The intended use of Alert is to inform the user about errors and other exceptional conditions.


• The constructor public Alert(String title) constructs a new, empty Alert object with the given title.

soundAlert.setType( AlertType.ERROR );
The method public void setType(AlertType type) sets the type of the Alert. The handling and behavior of specific AlertTypes is described in AlertType. An ERROR AlertType is a hint to alert the user to an erroneous operation.

soundAlert.setString( "** ERROR **" );
The method public void setString(String str) sets the text string used in the Alert.

java.util.Date now = new java.util.Date( );

• The class java.util.Date represents a specific instant in time, with millisecond precision.


• The constructor public Date( ) allocates a Date object and initializes it to represent the current time specified number of milliseconds since the standard base time known as “the epoch,” namely January 1, 1970, 00:00:00 GMT.

date.setDate( now );
The method public void javax.microedition.lcdui.DateField.setDate(Date date) sets a new value for this field.