Uploaded byKirill Rozov
Why Kotlin - Apalon Kotlin Sprint Part 1
Kotlin is a modern programming language that was created by JetBrains as a replacement for Java, with some key advantages: - It simplifies development tasks like creating data classes and working with collections. Kotlin also reduces the amount of code needed for common operations. - Kotlin works seamlessly with Java code and is fully interoperable. It is also compatible with existing Java tools and platforms. - The language has seen growing adoption since its 1.0 release in 2016 and is now officially supported by Google for Android development. Many large companies and open source projects use Kotlin due to its improvements over Java.
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Why Kotlin - Apalon Kotlin Sprint Part 1
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- 2. Kirill Rozov Senior AndroidDeveloper @kiryl.rozau kiryl.rozau@apalon.com
- 3. Main facts • Wasborn at JetBrains in 2010 • Modern replacement of Java • Releases • 1.0 was at February 2016 • 1.1 was at March 2017 • Kotlin is official supported by Google for Android
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- 6. Data Class inJava public class Device { private String id; private String name; private String cpu; private long ramSize; public Device(@NotNull String id, @NotNull String name, @NotNull String cpu, long ramSize) { this.id = id; this.name = name; this.cpu = cpu; this.ramSize = ramSize; } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getCpu() { return cpu; } public void setCpu(String cpu) { this.cpu = cpu; } public long getRamSize() { return ramSize; } public void setRamSize(long ramSize) { this.ramSize = ramSize; } @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; Device device = (Device) o; return ramSize == device.ramSize && id.equals(device.id) && name.equals(device.name) && cpu.equals(device.cpu); } @Override public int hashCode() { int result = id.hashCode(); result = 31 * result + name.hashCode(); result = 31 * result + cpu.hashCode(); result = 31 * result + (int) (ramSize ^ (ramSize >>> 32)); return result; } @Override public String toString() { return "Device{" + "id='" + id + ''' + ", name='" + name + ''' + ", cpu='" + cpu + ''' + ", ramSize=" + ramSize + ‘}'; } }
- 7. Data Class inKotlin data class Device(var id: String, var name: String, var cpu: String, var ramSize: Long)
- 8. Operations with dataarray List<Device> qualcommCpuDevices = new ArrayList<>(); for (Device device : devices) if (device.getCpu().equals("Qualcomm")) qualcommCpuDevices.add(device); List<Device> largeRamQualcommDevices = new ArrayList<>(); for (Device device : qualcommCpuDevices) if (isLargeRamDevice(device)) largeRamQualcommDevices.add(device); List<String> deviceNames = new ArrayList<>(); for (Device device : largeRamQualcommDevices) deviceNames.add(device.getName());
- 9. Operations with dataarray devices.stream() .filter(device -> device.getCpu().equals("Qualcomm")) .filter(Device::isLargeRamDevice) .map(Device::getName) .collect(Collectors.toList()); List<Device> qualcommCpuDevices = new ArrayList<>(); for (Device device : devices) if (device.getCpu().equals("Qualcomm")) qualcommCpuDevices.add(device); List<Device> largeRamQualcommDevices = new ArrayList<>(); for (Device device : qualcommCpuDevices) if (isLargeRamDevice(device)) largeRamQualcommDevices.add(device); List<String> deviceNames = new ArrayList<>(); for (Device device : largeRamQualcommDevices) deviceNames.add(device.getName());
- 10. Operations with dataarray devices.stream() .filter(device -> device.getCpu().equals("Qualcomm")) .filter(Device::isLargeRamDevice) .map(Device::getName) .collect(Collectors.toList()); devices.filter { it.cpu == "Qualcomm" } .filter(Device::isLargeRamDevice) .map { it.name } .toList()
- 11. Operations with dataarray Characters 0 100 200 300 400 500 Java Java 8 Kotlin 97 153 447
- 12. Simplify the development •Reducing the amount of code • Integration with modern development software • Built-in tools for improving code stability
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- 15. Interoperability • 100% compatibilitywith Java code in both directions • No need to bundle additional runtime to the app • Backward compatibility with previous versions • Easy convert Java code to Kotlin
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- 17. Support • Developing byJetBrains • Google official support for Android • Open Source • Working with community • Frequent updates
- 18. GitHub repos count Repositories 0 2500 5000 7500 10000 20132014 2015 2016 2017 Now Release 1.0 Release 1.1 Official Android support
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- 24. Learning • Easy “GettingStarted” • Studying Kotlin: online or offline • Many code samples and videos • Good documentation • Books from language makers
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- 26. Reduce time 1. Lesstime for implementation 2. More stability -> less test time 3. Interoperability with old projects 4. Low entry barrier for Java developers 5. Common codebase for different platforms
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