Swing I - Java - page 943

Display 17.18 Some Methods in the Class JTextComponent
All these methods are inherited by the classes JTextField and JTextArea .
The abstract class JTextComponent is in the package javax.swing.text . The classes JTextField
and JTextArea are in the package javax.swing .
public String getText()
Returns the text that is displayed by this text component.
public boolean isEditable()
Returns true if the user can write in this text component. Returns false if the user is not allowed to
write in this text component.
public void setBackground(Color theColor)
Sets the background color of this text component.
public void setEditable( boolean argument)
If argument is true , then the user is allowed to write in the text component. If argument is false ,
then the user is not allowed to write in the text component.
public void setText(String text)
Sets the text that is displayed by this text component to be the specified text .
The Classes JTextField and JTextArea
The classes JTextField and JTextArea can be used to add areas for changeable text to a
GUI. An object of the class JTextField has one line that displays some specified number of
characters. An object of the class JTextArea has a size consisting of a specified number of
lines and a specified number of characters per line. More text can be typed into a JText-
Field or JTextArea than is specified in its size, but the extra text may not be visible.
The number of characters per line and the number of lines are a guaranteed minimum. More
lines and especially more characters per line may be visible. (The space per line is actually
guaranteed to be Characters_Per_Line times the space for one uppercase letter M.)
SYNTAX
JTextField Name_of_Text_Field = new JTextField( Characters_Per_Line );
JTextArea Name_of_Text_Area =
new JTextArea( Number_of_Lines , Characters_Per_Line );
EXAMPLES
JTextField name = new JTextField(30);
JTextArea someText = new JTextArea(10, 30);
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