Membuat JFrame Di Tengah Layar Monitor

Preview:

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Solusi:
int panjangJFrame = 800;
int lebarJFrame = 500;
Toolkit toolkit = getToolkit();
Dimension screenSize = toolkit.getScreenSize();
setBounds(screenSize.width/2-panjangJFrame/2, screenSize.height/2-lebarJFrame/2, panjangJFrame, lebarJFrame);

Penyelesaian:
import java.awt.Dimension;
import java.awt.Toolkit;
import javax.swing.JFrame;

public class Application extends JFrame {

    public Application() {
        super("Kalkulator Ilmiah by Dana v1.6");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
        int panjangJFrame = 800;
        int lebarJFrame = 500;
        Toolkit toolkit = getToolkit();
        Dimension screenSize = toolkit.getScreenSize();
        setBounds(screenSize.width/2-panjangJFrame/2, screenSize.height/2-lebarJFrame/2, panjangJFrame, lebarJFrame);
    }

    public static void main(String[] args) {
        Application app = new Application();
    }
}