//销售额最大的配件
    public static String mostSale(int hp, int mpc, int cpsp){
    	String mostsale = null;
    	int my_hp = 0,my_mpc = 0,my_cpsp = 0;
    	my_hp = hp*80;
    	my_mpc = mpc * 10;
    	my_cpsp = cpsp * 8;
    	if(my_hp > my_mpc){
    		if(my_hp > my_cpsp){
    			mostsale = "耳机";
    		} else{
    			mostsale = "手机贴膜";
    		}
    	}else{
    		if(my_mpc > my_cpsp){
    			mostsale = "手机壳";
    		}else{
    			mostsale = "手机贴膜";
    		}
    	}
    	
		return mostsale;
    	
    }

    
    //销售配件最多与最少之差
    public static int diffSale(int hp, int mpc, int cpsp){
    	int diffsale = 0;
    	int df1 = Math.abs(hp - mpc);
    	int df2 = Math.abs(hp - cpsp);
    	int df3 = Math.abs(mpc - cpsp);
    	diffsale = df1 > df2 ? df1:df2;
    	diffsale = diffsale > df3 ? diffsale : df3;
    	return diffsale;
    }

package demo;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

import org.junit.experimental.theories.ParameterSignature;

public class shabi {
	public static void main(String[] args) {
		JFrame frame = new JFrame("佣金計算");
		frame.setLayout(null);
		
		JLabel title = new JLabel("請輸入銷售數量:");
		JLabel hp = new JLabel("耳機:");
		JLabel mpc = new JLabel("手機殼:");
		JLabel cpsp = new JLabel("貼膜:");
		JLabel commission = new JLabel("應返還的佣金:");
		JLabel mostsale = new JLabel("銷售額最高的配件是:");
		JLabel diffsale = new JLabel("銷售陪嫁最多與最少數量相差:");
		
		JButton ok = new JButton("ok");
		JButton cancel = new JButton("cancel");
		
		JTextField out_hp = new JTextField();
		JTextField out_mpc = new JTextField();
		JTextField out_cpsp = new JTextField();
		JTextField out_commission = new JTextField();
		JTextField out_mostsale = new JTextField();
		JTextField out_diffsale = new JTextField();
		
		ok.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				int i_hp = Integer.parseInt(out_hp.getText());
				int i_mpc = Integer.parseInt(out_mpc.getText());
				int i_cpsp = Integer.parseInt(out_cpsp.getText());
				float i_commission = Commission.commission(i_hp, i_mpc, i_cpsp);
				String s_commission = String.format("%f", i_commission);
				out_commission.setText(s_commission);
				String i_mostsale = Commission.mostSale(i_hp, i_mpc, i_cpsp);
				out_mostsale.setText(i_mostsale);
				int i_diffsale = Commission.diffSale(i_hp, i_mpc, i_cpsp);
				String s_diffsale = String.format("%d", i_diffsale);
				out_diffsale.setText(s_diffsale);
			}
		});
		
		cancel.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				out_hp.setText("");
				out_mpc.setText("");
				out_cpsp.setText("");
				out_commission.setText("");
				out_mostsale.setText("");
				out_diffsale.setText("");
			}
		});
		
        title.setBounds(5,5,220,20);
        hp.setBounds(5,40,30,20);
        mpc.setBounds(75,40,50,20);
        cpsp.setBounds(155,40,30,20);
        commission.setBounds(5,95,100,20);
        mostsale.setBounds(5,125,120,20);
        diffsale.setBounds(5,155,180,20);
        
        out_hp.setBounds(35,40,30,20);
        out_mpc.setBounds(125,40,30,20);
        out_cpsp.setBounds(185,40,30,20);
        out_commission.setBounds(95,90,120,20);
        out_mostsale.setBounds(125,125,90,20);
        out_diffsale.setBounds(185,155,30,20);

        ok.setBounds(10,70,75,20);
        cancel.setBounds(120,70,75,20);        
    
        frame.add(title);
        frame.add(hp);
        frame.add(mpc);
        frame.add(cpsp);
        frame.add(commission);
        frame.add(mostsale);
        frame.add(diffsale);
        
        frame.add(out_hp);
        frame.add(out_mpc);
        frame.add(out_cpsp);
        frame.add(out_commission);
        frame.add(out_mostsale);
        frame.add(out_diffsale);
        
        frame.add(ok);
        frame.add(cancel);
        
        frame.setSize(250, 250);
        frame.setLocation(250,250);
        frame.setVisible(true);
	}
}