What is setBounds and how do I use it

Question

I cannot find anything on setBounds  what it is for  or what its function actually is   Could someone clear me up on this   Thanks so much

User · Answer

There is an answer by  hexafraction   He had specified the x and y to be top right corner which is wrong  those are top left corner    I have also provided the source please check it   public void setBounds int x               int y               int width               int height    Moves and resizes this component  The new location of the top-left corner is specified by x and y  and the new size is specified by width and height  This method changes layout-related information  and therefore  invalidates the component hierarchy   Parameters      x - the new x-coordinate of this component      y - the new y-coordinate of this component      width - the new width of this component      height - the new height of this component   source - setBounds

User · Answer

here s a short paragraph from this article How to Make Frames  Main Windows  - The Java Tutorials - Oracle that explains what setBounds method does in addition to some other similar methods   The pack method sizes the frame so that all its contents are at or above their preferred sizes  An alternative to pack is to establish a frame size explicitly by calling setSize or setBounds  which also sets the frame location   In general  using pack is preferable to calling setSize  since pack leaves the frame layout manager in charge of the frame size  and layout managers are good at adjusting to platform dependencies and other factors that affect component size   the parameters of setBounds are  int x  int y  int width  int height  x and y are define the position location and width and height define the size dimension of the frame

User · Answer

setBounds is used to define the bounding rectangle of a component   This includes it s position and size   The is used in a number of places within the framework      It is used by the layout manager s to  define the position and size of a component within it s parent container  It is used by the paint sub system to define clipping bounds when painting the component    For the most part  you should never call it   Instead  you should use appropriate layout managers and let them determine the best way to provide information to this method

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The way that Java Swing UIs work is that for each JPanel there is always a LayoutManager that decides on where to exactly place your components  Each layout managers works differently  so if you use for example a BorderLayout  setBounds   is not used by the LayoutManager  instead component placement is decided by East West South North Center   For the NullLayoutManager  in case you used new JPanel null   however  each component has to have an x and y coordinate  Stupid Sidenote  if your UI would be three-dimensional there would also be a z coordinate   So with public void Component setBounds int x  int y  int width  int height  you specify where your component is placed and how many pixel it is wide and high   Here s an example    import java awt Dimension  import javax swing JFrame  import javax swing JLabel  import javax swing JPanel   public class JTableInNullLayout     public static void main String   argv  throws Exception          JPanel panel   new JPanel null          JLabel helloLabel   new JLabel  Hello world           helloLabel setBounds  10  50  60  20       x  y  width  height       panel add helloLabel          JFrame frame   new JFrame          frame add panel         frame setPreferredSize  new Dimension 200 200          frame pack          frame setVisible true

User · Answer

This is a method of the java awt Component class  It is used to set the position and size of a component      setBounds  public void setBounds int x                    int y                    int width                    int height         Moves and resizes this component  The new location of the top-left corner is specified by x and y  and   the new size is specified by width and height    Parameters            x - the new x-coordinate of this component     y - the new y-coordinate of this component     width - the new width of this component     height - the new height of this component      x and y as above correspond to the upper left corner in most  all   cases   It is a shortcut for setLocation and setSize   This generally only works if the layout layout manager are non-existent  i e  null

User · Answer

Actually  a Swing component does have multiple dimensions  as    current size - setSize   and setBounds   sets this minimum size - setMinimumSize   sets this preferred size - setPerferredSize   sets this maximum size - setMaximumSize   sets this    SetBounds is a shortcut for setting current size plus location of the widget if you don t use any layout manager   If you use a layout manager  it is the responsibility of the layout manager to lay out your components  taking into account the preferred size you set  and ensuring that the comonent never gets smaller than its minimumSize or bigger than its maximumSize    In this case  the layoutManager will call setSize  or setBounds   and you can not really control the position or dimension of the component   The whole point of using a layout manager is to have a platform and window-size independent way of laying out your components automatically  therefore you don t expect to call setSize from your code    Personal comment  There are buggy layout managers  I personally hate all of them and rolled my own  which offers the flexibility of MigLayout without the learning curve

User · Answer

You can use setBounds x  y  width  height  to specify the position and size of a GUI component if you set the layout to null  Then  x  y  is the coordinate of the upper-left corner of that component

[java] What is setBounds and how do I use it?

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