draw 2d curve with showing x axis and y axis

File comment: Screenshot

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package xycurve;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTextField;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

 
public class myPanel extends JPanel implements ChangeListener{
    
    /** Creates a new instance of myPanel */
    
    private JButton randButton=new JButton("Draw");
    private JSlider brislide=new JSlider(0,255,128);
    private JTextField myText=new JTextField(3);
    private JLabel myLabel=new JLabel("Max  Temperature ");
    private int[] temparray=new int[]{7,10,25,50,30};
    private float[] timearray=new float[] {8.15f, 8.45f, 9.15f, 9.45f, 10.15f};
    private int oldy;
    public myPanel() {
        
        randButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                
                
                
                repaint();
            }
        });
        
        brislide.addChangeListener(this);
        add(randButton);
        add(brislide);
    }
    
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        
        g.drawLine(10,300,10,200);
        g.drawLine(10,300,110,300);
        g.setColor(Color.BLUE);
        oldy=0;
        for(int i=0;i<timearray.length*20;i+=20) {
            g.drawLine(30+i-20,300-oldy,30+i,300-temparray[i/20]);
            oldy=temparray[i/20];
            g.setColor(Color.RED.brighter());
            g.drawOval(30+i-2,300-temparray[i/20]-2,4,4);
            g.setColor(Color.BLUE);
            
        }
        g.setColor(Color.RED);
        g.drawString("Temperature",10,100);
        g.drawString("Time  ",120,300);
    }

    public void stateChanged(ChangeEvent e) {
        /// Called when You change the Slider Value 
        System.out.println(brislide.getValue());
    }
    
}