java Random

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;

import javax.swing.*;

public class Coin  implements ActionListener {
 static JLabel label;
  public static void main(String[] args){
    JFrame frame = new JFrame("Coin Program");
    frame.setPreferredSize(new Dimension(200,120));
    frame.setLocation(500,400);
    Container contentPane = frame.getContentPane();
    JButton button = new JButton("코인 던지기");
    label = new JLabel(" ");
    contentPane.add(button,BorderLayout.CENTER);
    contentPane.add(label,BorderLayout.SOUTH);
    Coin listener = new Coin();
    button.addActionListener(listener);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
    }

@Override
public void actionPerformed(ActionEvent arg0) {
 // TODO Auto-generated method stub
  int f=0,b=0;
 Random oRandom = new Random();
 for(int i= 0;i<77;i++){
   // 1~77까지의 정수를 랜덤하게 출력
     int r = oRandom.nextInt(77) + 1;
  //앞뒤판단 
  if(r%2==0)f++;
  else b++;
  
 }
 label.setText("앞: "+f+"뒷: "+b);
}
    }

//의문점 쪽지 주세요