Creating Windows - Beginning Java - page 877

wndSize.width/2, wndSize.height/2); // Size
aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

SpringLayout layout = new SpringLayout(); // Create a

layout manager
Container content = aWindow.getContentPane(); // Get the

content pane
content.setLayout(layout); // Set the

container layout mgr

JButton[] buttons = new JButton[6]; // Array to

store buttons
SpringLayout.Constraints constr = null;
for(int i = 0; i < buttons.length; ++i) {
buttons[i] = new JButton("Press " + (i+1));
content.add(buttons[i]); // Add a Button

to content pane
}

Spring xSpring = Spring.constant(5,15,25); // x constraint

for 1st button
Spring ySpring = Spring.constant(10,30, 50); // y constraint

for 1st button

// Connect x,y for first button to left and top of container by
springs
constr = layout.getConstraints(buttons[0]);
constr.setX(xSpring);
constr.setY(ySpring);

// Hook buttons together with springs
for(int i = 1 ; i < buttons.length ; ++i) {
constr = layout.getConstraints(buttons[i]);
layout.putConstraint(SpringLayout.WEST, buttons[i],
xSpring,SpringLayout.EAST, buttons[i-1]);
layout.putConstraint(SpringLayout.NORTH, buttons[i],
ySpring,SpringLayout.SOUTH,

buttons[i-1]);
}

aWindow.setVisible(true); // Display

the window
}

public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createWindow();

}

});

}

}