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@BetterZhang
BetterZhang committed Jun 27, 2017
0 parents commit 0451881
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9 changes: 9 additions & 0 deletions .gitignore
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# Created by .ignore support plugin (hsz.mobi)
### Example user template template
### Example user template

# IntelliJ project files
.idea
*.iml
out
gen
66 changes: 66 additions & 0 deletions src/com/betterzhang/learnkotlin/java/Developer.java
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package com.betterzhang.learnkotlin.java;

/**
* Created by IntelliJ IDEA.
* Author : Andrew Zhang
* Email : betterzhang.dev@gmail.com
* Time : 2017/06/27 上午 10:37
* Desc : description
*/
public class Developer {

private String name;
private int age;

public Developer(String name, int age) {
this.name = name;
this.age = age;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;

Developer developer = (Developer) o;

if (age != developer.age) return false;
return name.equals(developer.name);
}

@Override
public int hashCode() {
int result = name.hashCode();
result = 31 * result + age;
return result;
}

@Override
protected Object clone() throws CloneNotSupportedException {
return (Developer) super.clone();
}

@Override
public String toString() {
return "Developer{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
}
172 changes: 172 additions & 0 deletions src/com/betterzhang/learnkotlin/java/JavaExample.java
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package com.betterzhang.learnkotlin.java;

import java.util.*;

/**
* Created by IntelliJ IDEA.
* Author : Andrew Zhang
* Email : betterzhang.dev@gmail.com
* Time : 2017/06/27 上午 10:47
* Desc : description
*/
public class JavaExample {

int score;

public static void main(String[] args) {

System.out.print("Andrew Zhang\n");
System.out.println("Andrew Zhang");

String name1 = "Andrew Zhang";
final String name2 = "Andrew Zhang";

String otherName;
otherName = null;

String text = "abc";
if (text != null) {
int length = text.length();
}

String firstName = "Andrew";
String lastName = "Zhang";
String message = "My name is: " + firstName + " " + lastName;

String text2 = "First Line\n" +
"Second Line\n" +
"Third Line\n";

int x = 10;
String text3 = x > 5 ? "x > 5" : "x <= 5";
String message2 = null;
System.out.println(message2 != null ? message : "");

int a = 10, b = 20;
final int andResult = a & b;
final int orResult = a | b;
final int xorResult = a ^ b;
final int rightShift = a >> 2;
final int leftShift = a << 2;

Object obj = new Object();
if (obj instanceof Developer) {

}
Developer developer = (Developer) obj;

if (obj instanceof Developer) {
Developer developer2 = (Developer) obj;
}

int score = 80;
if (score >= 0 && score <=300) {}

String grade;
switch (score) {
case 10:
case 9:
grade = "Excellent";
break;
case 8:
case 7:
case 6:
grade = "Good";
break;
case 5:
case 4:
grade = "Ok";
break;
case 3:
case 2:
case 1:
grade = "Fail";
break;
default:
grade = "Fail";
break;
}

for (int i = 1; i <= 10; i++) {}
for (int i = 1; i < 10; i++) {}
for (int i = 10; i >=0; i--) {}
for (int i = 1; i <= 10; i += 2) {}
for (int i = 10; i >=0; i -= 2) {}
List<String> collection = new ArrayList<>();
for (String item : collection) {}
Map<String, String> map = new HashMap<>();
for (Map.Entry<String, String> entry : map.entrySet()) {}

final List<Integer> listOfNumber = Arrays.asList(1, 2, 3, 4);
final Map<Integer, String> keyValue = new HashMap<Integer, String>();
keyValue.put(1, "one");
keyValue.put(2, "two");
keyValue.put(3, "three");

// Java 9
// final List<Integer> listOfNumber2 = List.of(1, 2, 3, 4);
// final Map<Integer, String> keyValue2 = Map.of(1, "one",
// 2, "two",
// 3, "three");

// Java 7 and below
List<Developer> developers = new ArrayList<>();
for (Developer developer2 : developers) {
System.out.println(developer2.getName());
}

// Java 8+
developers.forEach(developer3 -> System.out.println(developer3.getName()));

// Java 7 and below
for (Developer developer2 : developers) {
if (developer2.getAge() > 30) {
System.out.println(developer2.getAge());
}
}

// Java 8+
developers.stream().filter(developer3 -> developer3.getAge() > 30).forEach(developer3 -> developer3.getAge());

Developer dev = new Developer("Mark", 22);
try {
Developer dev2 = (Developer) dev.clone();
} catch (CloneNotSupportedException e) {
e.printStackTrace();
}

int result = Util.triple(3);

Developer developer4;

}

void doSomething1() {
// logic here
}

void doSomething2(int... numbers) {
// logic here
}

int getScore() {
// logic here
return score;
}

int getScore2(int value) {
// logic here
return 2 * value;
}

}

class Util {
private Util() {}
public static int getScore(int value) {
return 2 * value;
}
public static int triple(int value) {
return 3 * value;
}
}
11 changes: 11 additions & 0 deletions src/com/betterzhang/learnkotlin/kotlin/Developer.kt
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package com.betterzhang.learnkotlin.kotlin

/**
* Created by IntelliJ IDEA.
* Author : Andrew Zhang
* Email : betterzhang.dev@gmail.com
* Time : 2017/06/27 上午 10:46
* Desc : description
*/

data class Developer(val name: String, val age: Int)
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