Java for the Beginning Programmer

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Product Details

• Paperback: 336 pages
• Publisher: Heaton Research, Inc. (May 22, 2006)
• Language: English
• ISBN-10: 0977320618
• ISBN-13: 978-0977320615
• Product Dimensions: 7.5 x 0.7 x 9.2 inches
• Shipping Weight: 1.3 pounds
• Average Customer Review: 4.5 out of 5 stars See all reviews(2 customer reviews)
• Amazon Best Sellers Rank: #2,117,661 in Books (See Top 100 in Books)
  

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关键词：Programmer Beginning Programme Program beginn Java

1. /**
   
2. * BadNumbers
   
3. * Copyright 2006 by Jeff Heaton(jeff@jeffheaton.com)
   
4. *
   
5. * Example program from Chapter 4
   
6. * Java for the Beginning Programmer
   
7. * http://www.heatonresearch.com/articles/series/15/
   
8. *
   
9. * This class shows how to input numbers, and handle an
   
10. * invalid number.
    
11. *
    
12. * This software is copyrighted. You may use it in programs
    
13. * of your own, without restriction, but you may not
    
14. * publish the source code without the author's permission.
    
15. * For more information on distributing this code, please
    
16. * visit:
    
17. *    http://www.heatonresearch.com/hr_legal.php
    
18. *
    
19. * @author Jeff Heaton
    
20. * @version 1.1
    
21. */
    
22. 
    
23. import java.io.*;
    
24. 
    
25. public class BadNumbers
    
26. {
    
27.   public static void main(String args[])
    
28.   {
    
29.     try
    
30.     {
    
31.       InputStreamReader inputStreamReader =
    
32.         new InputStreamReader ( System.in );
    
33.       BufferedReader in =
    
34.         new BufferedReader ( inputStreamReader );
    
35.       System.out.print("Enter a length in miles? ");
    
36.       String miles = in.readLine();
    
37.       double dMiles = Double.parseDouble(miles);
    
38.       double dKilometers = 1.609344 *dMiles;
    
39.       System.out.println("That is " + dKilometers +
    
40.         " kilometers.");
    
41.     }
    
42.     catch(NumberFormatException e)
    
43.     {
    
44.       System.out.println(
    
45.         "You entered an invalid number.");
    
46.     }
    
47.     catch(IOException e)
    
48.     {
    
49.     }
    
50.   }
    
51. }

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1. /**
   
2. * Hello
   
3. * Copyright 2006 by Jeff Heaton(jeff@jeffheaton.com)
   
4. *
   
5. * Example program from Chapter 4
   
6. * Java for the Beginning Programmer
   
7. * http://www.heatonresearch.com/articles/series/15/
   
8. *
   
9. * This class shows how to input strings.
   
10. *
    
11. * This software is copyrighted. You may use it in programs
    
12. * of your own, without restriction, but you may not
    
13. * publish the source code without the author's permission.
    
14. * For more information on distributing this code, please
    
15. * visit:
    
16. *    http://www.heatonresearch.com/hr_legal.php
    
17. *
    
18. * @author Jeff Heaton
    
19. * @version 1.1
    
20. */
    
21. 
    
22. import java.io.*;
    
23. 
    
24. public class Hello
    
25. {
    
26.   public static void main(String args[])
    
27.   {
    
28.     try
    
29.     {
    
30.       InputStreamReader inputStreamReader =
    
31.         new InputStreamReader ( System.in );
    
32.       BufferedReader in =
    
33.         new BufferedReader ( inputStreamReader );
    
34.       System.out.print("What is your name? ");
    
35.       String name = in.readLine();
    
36.       System.out.println("Hello " + name );
    
37.     }
    
38.     catch(IOException e)
    
39.     {
    
40.     }
    
41.   }
    
42. }

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1. /**
   
2. * InvalidString
   
3. * Copyright 2006 by Jeff Heaton(jeff@jeffheaton.com)
   
4. *
   
5. * Example program from Chapter 5
   
6. * Java for the Beginning Programmer
   
7. * http://www.heatonresearch.com/articles/series/15/
   
8. *
   
9. * This class shows how NOT to compare two strings.  Do not use == on strings!
   
10. *
    
11. * This software is copyrighted. You may use it in programs
    
12. * of your own, without restriction, but you may not
    
13. * publish the source code without the author's permission.
    
14. * For more information on distributing this code, please
    
15. * visit:
    
16. *    http://www.heatonresearch.com/hr_legal.php
    
17. *
    
18. * @author Jeff Heaton
    
19. * @version 1.1
    
20. */
    
21. 
    
22. import java.io.*;
    
23. 
    
24. class InvalidString
    
25. {
    
26.   public static void main(String args[])
    
27.   {
    
28.     try
    
29.     {
    
30.       InputStreamReader inputStreamReader =
    
31.         new InputStreamReader ( System.in );
    
32.       BufferedReader in =
    
33.         new BufferedReader ( inputStreamReader );
    
34.       System.out.print(
    
35.         "What is your favorite color? ");
    
36.       String color = in.readLine();
    
37.       if( color=="red" )
    
38.         System.out.println(
    
39.           "My favorite color is red too!");
    
40.     }
    
41.     catch(IOException e)
    
42.     {
    
43.     }
    
44.   }
    
45. }

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1. /**
   
2. * NumberCase
   
3. * Copyright 2006 by Jeff Heaton(jeff@jeffheaton.com)
   
4. *
   
5. * Example program from Chapter 5
   
6. * Java for the Beginning Programmer
   
7. * http://www.heatonresearch.com/articles/series/15/
   
8. *
   
9. * This class shows how to use the switch/case.
   
10. *
    
11. * This software is copyrighted. You may use it in programs
    
12. * of your own, without restriction, but you may not
    
13. * publish the source code without the author's permission.
    
14. * For more information on distributing this code, please
    
15. * visit:
    
16. *    http://www.heatonresearch.com/hr_legal.php
    
17. *
    
18. * @author Jeff Heaton
    
19. * @version 1.1
    
20. */
    
21. 
    
22. import java.io.*;
    
23. 
    
24. class NumberCase
    
25. {
    
26.   public static void main(String args[])
    
27.   {
    
28.     try
    
29.     {
    
30.       InputStreamReader inputStreamReader =
    
31.         new InputStreamReader ( System.in );
    
32.       BufferedReader in =
    
33.         new BufferedReader ( inputStreamReader );
    
34.       System.out.print(
    
35.         "Enter a number between 1 and 5? ");
    
36.       String num = in.readLine();
    
37.       int number = Integer.parseInt(num);
    
38.       switch( number )
    
39.       {
    
40.         case 1:
    
41.           System.out.println("You entered One.");
    
42.           break;
    
43.         case 2:
    
44.           System.out.println("You entered Two.");
    
45.           break;
    
46.         case 3:
    
47.           System.out.println("You entered Three.");
    
48.           break;
    
49.         case 4:
    
50.           System.out.println("You entered Four.");
    
51.           break;
    
52.         case 5:
    
53.           System.out.println("You entered Five.");
    
54.           break;
    
55.         default:
    
56.           System.out.println(
    
57.             "You did not enter a number between 1 and 5.");
    
58.           break;
    
59.       }
    
60.     }
    
61.     catch(NumberFormatException e)
    
62.     {
    
63.       System.out.println(
    
64.         "You must enter a valid number.");
    
65.     }
    
66.     catch(IOException e)
    
67.     {
    
68.     }
    
69.   }
    
70. }

复制代码

1. /**
   
2. * NumberIf
   
3. * Copyright 2006 by Jeff Heaton(jeff@jeffheaton.com)
   
4. *
   
5. * Example program from Chapter 5
   
6. * Java for the Beginning Programmer
   
7. * http://www.heatonresearch.com/articles/series/15/
   
8. *
   
9. * This class shows how to use "if statements" with numbers.
   
10. *
    
11. * This software is copyrighted. You may use it in programs
    
12. * of your own, without restriction, but you may not
    
13. * publish the source code without the author's permission.
    
14. * For more information on distributing this code, please
    
15. * visit:
    
16. *    http://www.heatonresearch.com/hr_legal.php
    
17. *
    
18. * @author Jeff Heaton
    
19. * @version 1.1
    
20. */
    
21. 
    
22. import java.io.*;
    
23. 
    
24. class NumberIf
    
25. {
    
26.   public static void main(String args[])
    
27.   {
    
28.     try
    
29.     {
    
30.       InputStreamReader inputStreamReader =
    
31.         new InputStreamReader ( System.in );
    
32.       BufferedReader in =
    
33.         new BufferedReader ( inputStreamReader );
    
34.       System.out.print(
    
35.         "Enter a number between 1 and 5? ");
    
36. 
    
37.       String num = in.readLine();
    
38.       int number = Integer.parseInt(num);
    
39.       if( number==1 )
    
40.       {
    
41.         System.out.println("You entered One.");
    
42.       }
    
43.       else if( number==2 )
    
44.       {
    
45.         System.out.println("You entered Two.");
    
46.       }
    
47.       else if( number==3 )
    
48.       {
    
49.         System.out.println("You entered Three.");
    
50.       }
    
51.       else if( number==4 )
    
52.       {
    
53.         System.out.println("You entered Four.");
    
54.       }
    
55.       else if( number==5 )
    
56.       {
    
57.         System.out.println("You entered Five.");
    
58.       }
    
59.       else
    
60.       {
    
61.         System.out.println(
    
62.           "You did not enter a number between 1 and 5.");
    
63.       }
    
64.     }
    
65.     catch(NumberFormatException e)
    
66.     {
    
67.       System.out.println(
    
68.         "You must enter a valid number.");
    
69.     }
    
70.     catch(IOException e)
    
71.     {
    
72.     }
    
73.   }
    
74. }

复制代码

1. /**
   
2. * OldEnough
   
3. * Copyright 2006 by Jeff Heaton(jeff@jeffheaton.com)
   
4. *
   
5. * Example program from Chapter 5
   
6. * Java for the Beginning Programmer
   
7. * http://www.heatonresearch.com/articles/series/15/
   
8. *
   
9. * This class checks to see if you are old enough to vote in the USA.
   
10. *
    
11. * This software is copyrighted. You may use it in programs
    
12. * of your own, without restriction, but you may not
    
13. * publish the source code without the author's permission.
    
14. * For more information on distributing this code, please
    
15. * visit:
    
16. *    http://www.heatonresearch.com/hr_legal.php
    
17. *
    
18. * @author Jeff Heaton
    
19. * @version 1.1
    
20. */
    
21. 
    
22. import java.io.*;
    
23. 
    
24. class OldEnough
    
25. {
    
26.   public static void main(String args[])
    
27.   {
    
28.     try
    
29.     {
    
30.       InputStreamReader inputStreamReader =
    
31.         new InputStreamReader ( System.in );
    
32.       BufferedReader in =
    
33.         new BufferedReader ( inputStreamReader );
    
34.       System.out.print("How old are you? ");
    
35.       String age = in.readLine();
    
36.       int iAge = Integer.parseInt(age);
    
37.       if( iAge>=18 )
    
38.       {
    
39.         System.out.println(
    
40.           "You are old enough to vote in the United States.");
    
41.       }
    
42.       if( iAge<18 )
    
43.       {
    
44.         System.out.println(
    
45.           "You are not old enough to vote in" +
    
46.           " the United States");
    
47.       }
    
48.     }
    
49.     catch(NumberFormatException e)
    
50.     {
    
51.       System.out.println("That is not a valid age.");
    
52.     }
    
53.     catch(IOException e)
    
54.     {
    
55.     }
    
56.   }
    
57. }

复制代码

1. /**
   
2. * StringElse
   
3. * Copyright 2006 by Jeff Heaton(jeff@jeffheaton.com)
   
4. *
   
5. * Example program from Chapter 5
   
6. * Java for the Beginning Programmer
   
7. * http://www.heatonresearch.com/articles/series/15/
   
8. *
   
9. * This class shows how to use an "else" with an "if".
   
10. *
    
11. * This software is copyrighted. You may use it in programs
    
12. * of your own, without restriction, but you may not
    
13. * publish the source code without the author's permission.
    
14. * For more information on distributing this code, please
    
15. * visit:
    
16. *    http://www.heatonresearch.com/hr_legal.php
    
17. *
    
18. * @author Jeff Heaton
    
19. * @version 1.1
    
20. */
    
21. 
    
22. import java.io.*;
    
23. 
    
24. class StringElse
    
25. {
    
26.   public static void main(String args[])
    
27.   {
    
28.     try
    
29.     {
    
30.       InputStreamReader inputStreamReader =
    
31.         new InputStreamReader ( System.in );
    
32.       BufferedReader in =
    
33.         new BufferedReader ( inputStreamReader );
    
34.       System.out.print(
    
35.         "What is your favorite color? ");
    
36.       String color = in.readLine();
    
37.       if( color.equals("red") )
    
38.       {
    
39.         System.out.println(
    
40.           "My favorite color is red too!");
    
41.       }
    
42.       else
    
43.       {
    
44.         System.out.println("I guess " + color +
    
45.           " is okay, but I like red better.");
    
46.       }
    
47.     }
    
48.     catch(IOException e)
    
49.     {
    
50.     }
    
51.   }
    
52. }

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1. /**
   
2. * ValidString
   
3. * Copyright 2006 by Jeff Heaton(jeff@jeffheaton.com)
   
4. *
   
5. * Example program from Chapter 5
   
6. * Java for the Beginning Programmer
   
7. * http://www.heatonresearch.com/articles/series/15/
   
8. *
   
9. * This class shows the correct way to compare a string.
   
10. *
    
11. * This software is copyrighted. You may use it in programs
    
12. * of your own, without restriction, but you may not
    
13. * publish the source code without the author's permission.
    
14. * For more information on distributing this code, please
    
15. * visit:
    
16. *    http://www.heatonresearch.com/hr_legal.php
    
17. *
    
18. * @author Jeff Heaton
    
19. * @version 1.1
    
20. */
    
21. 
    
22. import java.io.*;
    
23. 
    
24. class ValidString
    
25. {
    
26.   public static void main(String args[])
    
27.   {
    
28.     try
    
29.     {
    
30.       InputStreamReader inputStreamReader =
    
31.         new InputStreamReader ( System.in );
    
32.       BufferedReader in =
    
33.         new BufferedReader ( inputStreamReader );
    
34. 
    
35.       System.out.print(
    
36.         "What is your favorite color? ");
    
37. 
    
38.       String color = in.readLine();
    
39. 
    
40.       if( color.equals("red") )
    
41.         System.out.println(
    
42.           "My favorite color is red too!");
    
43.     }
    
44.     catch(IOException e)
    
45.     {
    
46.     }
    
47.   }
    
48. }

复制代码

1. /**
   
2. * MethodCall
   
3. * Copyright 2006 by Jeff Heaton(jeff@jeffheaton.com)
   
4. *
   
5. * Example program from Chapter 6
   
6. * Java for the Beginning Programmer
   
7. * http://www.heatonresearch.com/articles/series/15/
   
8. *
   
9. * This class shows how objects can be used to return values from methods.
   
10. *
    
11. * This software is copyrighted. You may use it in programs
    
12. * of your own, without restriction, but you may not
    
13. * publish the source code without the author's permission.
    
14. * For more information on distributing this code, please
    
15. * visit:
    
16. *    http://www.heatonresearch.com/hr_legal.php
    
17. *
    
18. * @author Jeff Heaton
    
19. * @version 1.1
    
20. */
    
21. 
    
22. import javax.swing.*;
    
23. 
    
24. public class MethodCall
    
25. {
    
26.   static void changeValue(JButton button)
    
27.   {
    
28.     // Change the text of the button, this
    
29.     // new value is reflected outside of the
    
30.     // call to "changeValue"
    
31.     button.setText("New value");
    
32.   }
    
33. 
    
34.   static void changeReference(JButton button)
    
35.   {
    
36.     // Create a new button, and assign its
    
37.     // reference to "button". This change is
    
38.     // not reflected outside of the call
    
39.     // to "changeValue"
    
40.     button = new JButton("New value");
    
41.   }
    
42. 
    
43.   static void changePrimitive(int i)
    
44.   {
    
45.     i = i + 1;
    
46.   }
    
47. 
    
48.   /**
    
49.    * Main entry point for example.
    
50.    * @param args Not used.
    
51.    */
    
52.   public static void main(String args[])
    
53.   {
    
54.     // setup the variables
    
55.     JButton button1 = new JButton("Old Value");
    
56.     JButton button2 = new JButton("Old Value");
    
57.     int var = 5;
    
58.     // call the methods
    
59.     changeValue(button1);
    
60.     changeReference(button2);
    
61.     changePrimitive(var);
    
62.     // display the new values
    
63.     System.out.println("Button1:" +
    
64.     button1.getText());
    
65.     System.out.println("Button2:" +
    
66.     button2.getText());
    
67.     System.out.println("Primitive variable:" + var);
    
68.   }
    
69. }

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