![]() Only one element can be placed in either of the five positions.ĬardLayout is used to add more components to a container, from which only one is visible at any given time. GridLayout is used to place components in a matrix with configurable size.īorderLayout is used to place elements along the four borders and in center: NORTH, SOUTH, EAST, WEST and CENTER. Some of them are:įlowLayout is used to place elements horizontally, until they don't fit anymore, in which case, subsequent components are placed on the next line. These classes describe how elements are placed in a container. ![]() Cele mai importante sunt:Īnother series of classes required for implementing a GUI is the set of classes implementing interface. Aceste clase descriu modul în care elementele se așează într-un Container. O altă serie de clase necesară pentru implementarea unei interfețe grafice este setul de clase care extind interfața. JTextArea is a component where you can add a large text on more than one line. This too can have an associated event handler of type ActionListener which is triggered when Enter is pressed when the text field is focused. JTextField is an area where a short text can be entered, on a single line. It's used by specifying an event handler of type ActionListener (see #Event Handlers) which is triggered when the button is clicked. This can have either a text or an image displayed on top. JLabel is a component used to display text or image in a container. This is particularly useful when reusing a panel. It is recommended not to place elements directly in a JFrame, but in a JPanel that is placed in a JFrame. It can be visible, changing the background color, the image model or having a border, or be invisible, only used for the hierarchy of the content. JPanel is a generic container that can hold other elements. For a more detailed description, read the Oracle tutorial. ![]() Next, we'll present the elements required for task 6. So, there is a hierarchy of components, each element called parent containing other sub-components called children. This is a JFrame containing the most used elements in Swing:Īll Swing objects, with the exception of class JFrame, inherit class which in turn inherits (indirectly) class. It's the element associated with the horizontal bar containing the icon, application name and the three buttons minimize, maximize and close: The main container class for GUI elements is. create and layout buttons that will control deckītLayout( new GridLayout( 2, 2 ) ) įor ( int i = 0 i < controls.The package that contains the majority of classes for Swing applications is java.swing, some other other classes are used from the older package java.awt. JLabel label3 = new JLabel( "card three" ) Ĭard3.add( new JButton( "North" ), BorderLayout.NORTH ) Ĭard3.add( new JButton( "West" ), BorderLayout.WEST ) Ĭard3.add( new JButton( "East" ), BorderLayout.EAST ) Ĭard3.add( new JButton( "South" ), BorderLayout.SOUTH ) Ĭard3.add( label3, BorderLayout.CENTER ) ĭeck.add( card3, label3.getText() ) // add card to deck set up card3 and add it to JPanel deck ![]() JLabel label2 = new JLabel( "card two", SwingConstants.CENTER ) ĭeck.add( card2, label2.getText() ) // add card to deck set up card2 and add it to JPanel deck JLabel label1 = new JLabel( "card one", SwingConstants.CENTER ) ĭeck.add( card1, label1.getText() ) // add card to deck set up card1 and add it to JPanel deck Public class FlowLayoutDemo extends JFrame You can align the components left, right or center (default). This is the most basic layout manager, components are placed from left to right as they were added, when the edge is reached the components are put on the next line. unlike GridLayout each component size can vary and components can be added in any order. ![]() Allows components to be arranged left-to-right or top-to-bottom in a container ![]()
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