Final - Painter

import java.awt.Point;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.swing.JPanel;

public class PaintPanel extends JPanel
{
private int pointCount=0; //count number of points

//array of 10000 java.awet.Point references

private Point[] points=new Point[10000];

//set up GUI and register mouse event handler

public PaintPanel()
{
//handle frame mouse motion event

addMouseMotionListener(
new MouseMotionAdapter() //anonymous inner class
{
//store drag coordinates and repaint

public void mouseDragged(MouseEvent event)
{
if(pointCount {
points[pointCount]=event.getPoint(); //find point

pointCount++; //increment number of points in array

repaint(); // repaint JFrame

}//end if
}//end method mouseDragged
}//end anonymous inner class
);//end call to addMouseMotion Listener
}//end PaintPanel constructor

//draw ovals in a 4 by 4 bounding box at specified locations on window

public void paintComponent(Graphics g)

{
super.paintComponent(g); //clears drawing area

//draw all points in array

for (int i=0; i
g.fillOval(points[i].x, points[i].y,4,4);

}//end method paintComponent
}//end class PaintPanel

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import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class Painter

{
public static void main(String[]args)
{
//create JFrame

JFrame application=new JFrame("A simple paint program");

PaintPanel paintPanel=new PaintPanel(); //create paint panel

application.add(paintPanel, BorderLayout.CENTER); //in center

//create a label and place it in SOUTH of border layout

application.add(new JLabel("Drag the mouse to draw"),BorderLayout.SOUTH);

application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

application.setSize(400,200); //set frame size

application.setVisible(true); //display frame

}//end main
}//end class Painter

Wildcard Test

//wildcardTest.java

import java.util.ArrayList;

public class WildcardTest

{
public static void main(String[]args)

{
//create, initialize and output ArrayList of Integers, then display total of the elements

Integer[]integers = {1,2,3,4,5};

ArrayListintegerList=new ArrayList();

//insert elements in interger list

for (Integer element:integers)

integerList.add(element);

System.out.printf("integerList contains: %s\n", integerList);

System.out.printf("Total of the elements in integerList:%.0f\n\n", sum(integerList));

//create, initialize and output ArrayList of Doubles, then display total of the elements

Double[]doubles={1.1,3.3,5.5};

ArrayListdoubleList=new ArrayList();

//insert elements in doubleList

for (Double element:doubles)
doubleList.add(element);

System.out.printf("doubleList contains:%s\n", doubleList);

System.out.printf("Total of the elements in doubleList:%.1f\n\n", sum(doubleList));

//create, initialize and output ArrayList of numbers containing both integers and doubles, then display total of the elements

Number[]numbers={1,2.4,3,4.1}; //integers and doubles

ArrayListnumberList=new ArrayList();

//insert elements in numberList

for (Number element:numbers)
numberList.add(element);

System.out.printf("numberList contains:%s\n",numberList);
System.out.printf("Total of the elements in numberList:%.1f\n", sum (numberList));

}//end main

//total the elements; using a wildcard in the ArrayList parameter

public static double sum(ArrayListlist)

{
double total=0; //initialize total

//calculate sum

for (Number element:list)

total +=element.doubleValue();

return total;

}//end method sum
}//end class WildcardTest