├── .gitignore
├── .idea
├── description.html
├── project-template.xml
├── encodings.xml
├── vcs.xml
├── modules.xml
├── libraries
│ └── validation_api_2_0_1_Final.xml
├── misc.xml
└── workspace.xml
├── lib
└── validation-api-2.0.1.Final.jar
├── java14.iml
└── src
└── com
└── loiane
├── Person.java
├── Product.java
└── Java14Features.java
/.gitignore:
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1 | # Compiled class file
2 | *.class
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/.idea/description.html:
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1 | Simple Java application that includes a class with main() method
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/.idea/project-template.xml:
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2 | IJ_BASE_PACKAGE
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/lib/validation-api-2.0.1.Final.jar:
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https://raw.githubusercontent.com/loiane/java14-examples/HEAD/lib/validation-api-2.0.1.Final.jar
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/java14.iml:
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/src/com/loiane/Person.java:
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1 | package com.loiane;
2 |
3 | import java.util.Objects;
4 |
5 | public class Person {
6 | private String name;
7 | private int age;
8 |
9 | public Person(String name, int age) {
10 | this.name = name;
11 | this.age = age;
12 | }
13 |
14 | @Override
15 | public boolean equals(Object obj) {
16 | if (this == obj) return true;
17 | if (obj == null) return false;
18 | if (obj instanceof Person person) {
19 | return age == person.age &&
20 | Objects.equals(name, person.name);
21 | }
22 | return false;
23 | }
24 | }
25 |
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/src/com/loiane/Product.java:
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1 | package com.loiane;
2 |
3 | import javax.validation.constraints.Min;
4 | import javax.validation.constraints.NotNull;
5 |
6 | public record Product(
7 | @NotNull String name,
8 | int quantity,
9 | @Min(1) double price)
10 | implements Comparable {
11 |
12 | private static int COUNT = 0;
13 |
14 | public Product {
15 | if (quantity < 1) {
16 | throw new IllegalArgumentException("Product needs to have at least 1 quantity");
17 | }
18 | COUNT++;
19 | }
20 |
21 | static int count() {
22 | return COUNT;
23 | }
24 |
25 | @Override
26 | public int compareTo(Product o) {
27 | return 0;
28 | }
29 | }
30 |
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/src/com/loiane/Java14Features.java:
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1 | package com.loiane;
2 |
3 | import java.util.ArrayList;
4 |
5 | public class Java14Features {
6 |
7 | private enum DAY_OF_WEEK { MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY};
8 |
9 | public static void main(String[] args) {
10 | patternMatchingPreview();
11 | recordsPreview();
12 |
13 | enhancedSwitchCase(DAY_OF_WEEK.FRIDAY);
14 | switchJava14(DAY_OF_WEEK.SATURDAY);
15 |
16 | textBlocks();
17 |
18 | // need to add as parameter: -XX:+ShowCodeDetailsInExceptionMessages
19 | // helpfulNullPointerExceptions();
20 | }
21 |
22 | private static void patternMatchingPreview() {
23 | var person1 = new Person("Mary", 25);
24 | var person2 = new Person("John", 26);
25 | System.out.println(person1.equals(person2));
26 | }
27 |
28 | private static void helpfulNullPointerExceptions(){
29 | String[][] matrix = new String[5][5];
30 | matrix[1] = new String[5];
31 |
32 | if (matrix[1][0].toUpperCase().equals("S")) {
33 |
34 | }
35 | }
36 |
37 | private static void recordsPreview() {
38 |
39 | var product = new Product("Coffee", 10, 1.5);
40 | System.out.println(Product.count());
41 |
42 | var list = new ArrayList<>();
43 | list.add(new Product("Phone", 5, 1000));
44 | System.out.println(list);
45 |
46 | // "record" is not not keyword yet
47 | int record = 0;
48 | }
49 |
50 | private static String switchJava14(DAY_OF_WEEK dayOfWeek) {
51 | return switch (dayOfWeek) {
52 | case MONDAY:
53 | case TUESDAY:
54 | case WEDNESDAY:
55 | case THURSDAY:
56 | case FRIDAY:
57 | yield "Weekday";
58 | case SATURDAY:
59 | case SUNDAY:
60 | yield "Weekend";
61 | };
62 | }
63 |
64 | private static String enhancedSwitchCase(DAY_OF_WEEK dayOfWeek) {
65 | return switch (dayOfWeek) {
66 | case MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY -> "Weekday";
67 | case SATURDAY, SUNDAY -> "Weekend";
68 | };
69 | }
70 |
71 | private static void textBlocks() {
72 |
73 | String beforeQuery = "update products\n" +
74 | " set quantityInStock = ?\n" +
75 | " ,modifiedDate = ?\n" +
76 | " ,modifiedBy = ?\n" +
77 | "where productCode = ?\n";
78 |
79 | String updateQuery = """
80 | update products
81 | set quantityInStock = ?
82 | ,modifiedDate = ?
83 | ,modifiedBy = ?
84 | where productCode = ?
85 | """;
86 | System.out.println(updateQuery);
87 | System.out.println(".");
88 |
89 | // new in Java 14
90 | String updateQuery2 = """
91 | update products \
92 | set quantityInStock = ?
93 | ,modifiedDate = ?
94 | ,modifiedBy = ? \s
95 | where productCode = ?
96 | """;
97 | System.out.println(updateQuery2);
98 | System.out.println(".");
99 | }
100 | }
101 |
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