Java 9 Recipes A Problem Solution Approach 3rd Edition

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Release 出版日期: 2017-06-29

pages 页数: (626)
Quickly find solutions to dozens of common programming problems encountered while building Java applications. Content is presented in the popular problem-solution format. Look up the programming problem that you want to resolve. Read the solution. Apply the solution directly in your own code. Problem solved!

This revised edition covers important new features such as Java 9’s JShell and the new modularity features enabling you to separate code into independent modules that perform discrete tasks. Also covered are the new garbage collection algorithm and completely revamped process API. Enhanced JSON coverage is provided as well as a new chapter on JavaServer Faces development for web applications.

What You’ll Learn
Develop Java SE applications using the latest in Java SE technology
Exploit advanced features like modularity and lambdas
Use JShell to quickly develop solutions
Build dynamic web applications with JavaScript and Project Nashorn
Create great-looking web interfaces with JavaServer Faces
Generate graphics and work with media such as sound and video
Add internationalization support to your Java applications
Who This Book Is For
Both beginning Java programmers and advanced Java developers

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关键词：Solution Approach Edition problem solutio Java important presented building directly

1. 4-14. Comparing Two Dates
   
2. Problem
   
3. You want to determine if one date is greater than another.
   
4. Solution
   
5. Utilize one of the compareTo() methods that are part of the Date-Time API classes. In the following solution,
   
6. two LocalDate objects are compared and an appropriate message is displayed.
   
7. public static void compareDates(LocalDate ldt1,
   
8. LocalDate ldt2) {
   
9. int comparison = ldt1.compareTo(ldt2);
   
10. if (comparison > 0) {
    
11. System.out.println(ldt1 + " is larger than " + ldt2);
    
12. } else if (comparison < 0) {
    
13. System.out.println(ldt1 + " is smaller than " + ldt2);
    
14. } else {
    
15. System.out.println(ldt1 + " is equal to " + ldt2);
    
16. }
    
17. }

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1. 4-15. Finding the Interval Between Dates and Times
   
2. Problem
   
3. You need to determine how many hours, days, weeks, months, or years have elapsed between two dates or times.
   
4. Solution 1
   
5. Utilize the Date-Time API to determine the difference between two dates. Specifically, make use of
   
6. the Period class to determine the period of time, in days, between two dates. The following example
   
7. demonstrates how to obtain the interval of days, months, and years between two dates.
   
8. LocalDate anniversary = LocalDate.of(2000, Month.NOVEMBER, 11);
   
9. LocalDate today = LocalDate.now();
   
10. Period period = Period.between(anniversary, today);
    
11. System.out.println("Number of Days Difference: " + period.getDays());
    
12. System.out.println("Number of Months Difference: " + period.getMonths());
    
13. System.out.println("Number of Years Difference: " + period.getYears());

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1. 4-16. Obtaining Date-Time from a Specified String
   
2. Problem
   
3. You want to parse a String into a date-time object.
   
4. Solution
   
5. Utilize the parse() method of a temporal date-time class to parse a String using a predefined or custom
   
6. format. The following lines of code demonstrate how to parse a String into a date or date-time object using
   
7. variations of the parse() method.
   
8. // Parse a String to form a Date-Time object
   
9. LocalDate ld = LocalDate.parse("2014-12-28");
   
10. LocalDateTime ldt = LocalDateTime.parse("2014-12-28T08:44:00");
    
11. System.out.println("Parsed Date: " + ld);
    
12. System.out.println("Parsed Date-Time: " + ldt);
    
13. // Using a different Parser
    
14. LocalDate ld2 = LocalDate.parse("2014-12-28", DateTimeFormatter.ISO_DATE);
    
15. System.out.println("Different Parser: " + ld2);
    
16. // Custom Parser
    
17. String input = "12/28/2013";
    
18. try {
    
19. DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy");
    
20. LocalDate ld3 = LocalDate.parse(input, formatter);
    
21. System.out.println("Custom Parsed Date: " + ld3);
    
22. } catch (DateTimeParseException ex){
    
23. System.out.println("Not parsable: " + ex);
    
24. }

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