import javax.swing.JButton;
import javax.swing.JSplitPane;
public class Main {
public static void main(String[] argv) throws Exception {
JButton leftComponent = new JButton("left");
JButton rightComponent = new JButton("right");
JSplitPane pane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftComponent, rightComponent);
int loc = pane.getDividerLocation();
loc = (int) ((pane.getBounds().getWidth() - pane.getDividerSize()) / 2);
pane.setDividerLocation(loc);
double propLoc = .5D;
pane.setDividerLocation(propLoc);
}
}
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