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public class Test extends JFrame {
 
    public Test() {
        this.setPreferredSize(new Dimension(400, 400));
        this.pack();
        this.setVisible(true);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    }
 
    @Override
    public void paint(Graphics g) {
        super.paint(g);
 
        // define the position
        int locX = 200;
        int locY = 200;
 
        // draw a line (there is no drawPoint..)
        g.drawLine(locX, locY, locX, locY); 
    }
 
    public static void main(String[] args) {
        Test test = new Test(); 
    }
}

Main.java:1: error: class Test is public, should be declared in a file named Test.java
public class Test extends JFrame {
       ^
Main.java:1: error: cannot find symbol
public class Test extends JFrame {
                          ^
  symbol: class JFrame
Main.java:11: error: cannot find symbol
    public void paint(Graphics g) {
                      ^
  symbol:   class Graphics
  location: class Test
Main.java:4: error: cannot find symbol
        this.setPreferredSize(new Dimension(400, 400));
                                  ^
  symbol:   class Dimension
  location: class Test
Main.java:5: error: cannot find symbol
        this.pack();
            ^
  symbol: method pack()
Main.java:6: error: cannot find symbol
        this.setVisible(true);
            ^
  symbol: method setVisible(boolean)
Main.java:7: error: cannot find symbol
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
                                      ^
  symbol:   variable EXIT_ON_CLOSE
  location: class Test
Main.java:10: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:12: error: cannot find symbol
        super.paint(g);
        ^
  symbol:   variable super
  location: class Test
9 errors

Standard output is empty