Use Component listener to ensure frame visibilities

    

import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

import javax.swing.JFrame;

public class Main extends ComponentAdapter {
  public void componentMoved(ComponentEvent evt) {
    Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
    int x = evt.getComponent().getX();
    int y = evt.getComponent().getY();
    if (y < 0 ) {
      y = 0;
    }
    if (x < 0 ) {
      x = 0;
    }
    if (x > size.getWidth() - evt.getComponent().getWidth() ) {
      x = (int) size.getWidth() - evt.getComponent().getWidth();
    }
    if (y > size.getHeight() - evt.getComponent().getHeight() ) {
      y = (int) size.getHeight() - evt.getComponent().getHeight();
    }
    evt.getComponent().setLocation(x, y);
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame("Window cannot be moved to hide part of it");
    frame.setSize(300,300);

    frame.addComponentListener(new Main());
    frame.setVisible(true);
  }
}

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Use Component listener to ensure frame visibilities : Frame « Swing JFC « Java

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