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‎ap01/Series.java‎

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/**
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* Example method from Chapter 6.
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*/
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public class Series {
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public static int fibonacci(int n) {
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if (n == 1 || n == 2) {
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return 1;
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}
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return fibonacci(n - 1) + fibonacci(n - 2);
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}
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public static void main(String[] args) {
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if (fibonacci(1) != 1) {
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System.err.println("fibonacci(1) is incorrect");
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}
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if (fibonacci(2) != 1) {
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System.err.println("fibonacci(2) is incorrect");
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}
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if (fibonacci(3) != 2) {
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System.err.println("fibonacci(3) is incorrect");
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}
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}
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}

‎ap01/SeriesTest.java‎

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import junit.framework.TestCase;
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/**
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* Example JUnit test from Appendix A.
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*/
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public class SeriesTest extends TestCase {
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public void testFibonacci() {
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assertEquals(1, Series.fibonacci(1));
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assertEquals(1, Series.fibonacci(2));
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assertEquals(2, Series.fibonacci(3));
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}
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}

‎ap02/Drawing.java‎

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import java.awt.Canvas;
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import java.awt.Graphics;
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import javax.swing.JFrame;
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public class Drawing extends Canvas {
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public static void main(String[] args) {
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JFrame frame = new JFrame("My Drawing");
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Canvas drawing = new Drawing();
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drawing.setSize(400, 400);
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frame.add(drawing);
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frame.pack();
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frame.setVisible(true);
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}
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public void paint(Graphics g) {
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g.fillOval(100, 100, 200, 200);
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}
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}

‎ap02/Mickey.java‎

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import java.awt.Canvas;
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import java.awt.Color;
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import java.awt.Graphics;
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import java.awt.Rectangle;
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import javax.swing.JFrame;
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public class Mickey extends Canvas {
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public static void main(String[] args) {
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JFrame frame = new JFrame("Mickey Mouse");
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Canvas canvas = new Mickey();
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canvas.setSize(400, 400);
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canvas.setBackground(Color.white);
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frame.add(canvas);
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frame.pack();
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frame.setVisible(true);
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}
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public void paint(Graphics g) {
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Rectangle bb = new Rectangle(100, 100, 200, 200);
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mickey(g, bb);
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}
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public void boxOval(Graphics g, Rectangle bb) {
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g.fillOval(bb.x, bb.y, bb.width, bb.height);
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}
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public void mickey(Graphics g, Rectangle bb) {
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boxOval(g, bb);
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int dx = bb.width / 2;
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int dy = bb.height / 2;
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Rectangle half = new Rectangle(bb.x, bb.y, dx, dy);
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half.translate(-dx / 2, -dy / 2);
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boxOval(g, half);
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half.translate(dx * 2, 0);
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boxOval(g, half);
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}
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}

‎ap02/Moire.java‎

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import java.awt.Canvas;
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import java.awt.Color;
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import java.awt.Graphics;
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import javax.swing.JFrame;
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public class Moire extends Canvas {
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public static void main(String[] args) {
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JFrame frame = new JFrame("Moire Pattern");
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Canvas canvas = new Moire();
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canvas.setSize(400, 400);
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canvas.setBackground(Color.white);
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frame.add(canvas);
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frame.pack();
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frame.setVisible(true);
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}
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public void paint(Graphics g) {
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int i = 90;
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while (i < getWidth()) {
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g.drawOval(0, 0, i, i);
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i = i + 3;
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}
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}
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}

‎ch01/Goodbye.java‎

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/**
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* Example program that demonstrates print vs println.
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*/
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public class Goodbye {
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/**
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* Prints a greeting.
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*/
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public static void main(String[] args) {
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System.out.print("Goodbye, "); // note the space
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System.out.println("cruel world");
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}
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}

‎ch01/Hello.java‎

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public class Hello {
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public static void main(String[] args) {
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// generate some simple output
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System.out.println("Hello, World!");
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}
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}

‎ch02/Variables.java‎

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/**
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* Examples from Chapter 2.
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*/
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public class Variables {
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public static void main(String[] args) {
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String message;
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int x;
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String firstName;
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String lastName;
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int hour, minute;
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message = "Hello!"; // give message the value "Hello!"
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hour = 11; // assign the value 11 to hour
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minute = 59; // set minute to 59
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message = "123"; // legal
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// message = 123; // not legal
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String message2 = "Hello!";
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int hour2 = 11;
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int minute2 = 59;
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int a = 5;
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int b = a; // a and b are now equal
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a = 3; // a and b are no longer equal
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String firstLine = "Hello, again!";
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System.out.println(firstLine);
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System.out.print("The value of firstLine is ");
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System.out.println(firstLine);
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System.out.print("The current time is ");
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System.out.print(hour);
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System.out.print(":");
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System.out.print(minute);
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System.out.println(".");
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System.out.print("Number of minutes since midnight: ");
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System.out.println(hour * 60 + minute);
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System.out.print("Fraction of the hour that has passed: ");
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System.out.println(minute / 60);
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System.out.print("Percent of the hour that has passed: ");
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System.out.println(minute * 100 / 60);
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double pi;
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pi = 3.14159;
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double minute3 = 59.0;
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System.out.print("Fraction of the hour that has passed: ");
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System.out.println(minute3 / 60.0);
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double y = 1.0 / 3.0; // correct
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System.out.println(0.1 * 10);
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System.out.println(0.1 + 0.1 + 0.1 + 0.1 + 0.1
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+ 0.1 + 0.1 + 0.1 + 0.1 + 0.1);
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double balance = 123.45; // potential rounding error
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int balance2 = 12345; // total number of cents
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System.out.println(1 + 2 + "Hello");
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// the output is 3Hello
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System.out.println("Hello" + 1 + 2);
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// the output is Hello12
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System.out.println(17 * 3);
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System.out.println(hour * 60 + minute);
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int percentage;
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percentage = (minute * 100) / 60;
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hour = minute + 1; // correct
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// minute + 1 = hour; // compiler error
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}
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}

‎ch03/Convert.java‎

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import java.util.Scanner;
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/**
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* Converts centimeters to feet and inches.
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*/
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public class Convert {
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public static void main(String[] args) {
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double cm;
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int feet, inches, remainder;
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final double CM_PER_INCH = 2.54;
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final int IN_PER_FOOT = 12;
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Scanner in = new Scanner(System.in);
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// prompt the user and get the value
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System.out.print("Exactly how many cm? ");
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cm = in.nextDouble();
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// convert and output the result
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inches = (int) (cm / CM_PER_INCH);
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feet = inches / IN_PER_FOOT;
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remainder = inches % IN_PER_FOOT;
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System.out.printf("%.2f cm = %d ft, %d in\n",
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cm, feet, remainder);
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}
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}

‎ch03/Echo.java‎

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import java.util.Scanner;
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public class Echo {
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public static void main(String[] args) {
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String line;
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Scanner in = new Scanner(System.in);
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System.out.print("Type something: ");
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line = in.nextLine();
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System.out.println("You said: " + line);
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System.out.print("Type something else: ");
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line = in.nextLine();
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System.out.println("You also said: " + line);
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}
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}

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