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import nice.ui.common;

import javax.swing.*;

class HelloPanel extends JPanel
{
  private String greeting;
  void setGreeting(String);
}

paintComponent(HelloPanel panel ,g) 
{ 
  super;
  g.setColor(java.awt.Color.blue); 
  g.drawString(panel.greeting,5,40); 
}
   
setGreeting(HelloPanel panel, s) 
{ 
  this.greeting = s; 
  this.repaint(); 
}

void main(String[] args) 
{ 
  HelloPanel panel = new HelloPanel(greeting:"come inside");
  panel.init

    (mouseEntered: (java.awt.event.MouseEvent e) => { panel.setGreeting("Hello Nice World"); },
     mouseExited: (java.awt.event.MouseEvent e) => { panel.setGreeting("  Bye Nice World"); } 
     );

  
  JFrame frame = new JFrame("Hello Nice World").init
    (windowClosing: java.awt.event.WindowEvent e => System.exit(0)
     );
  
  frame.getContentPane().add(panel);
  frame.setSize(100,100);
  frame.show();
}