从java到Kotiln

System.out.print("Amit Shekhar");System.out.println("Amit Shekhar");

String name = "Amit Shekhar";final String name = "Amit Shekhar";

String otherName;otherName = null;

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

String firstName = "Amit";String lastName = "Shekhar";String message = "My name is: " + firstName + " " + lastName;

String text = "First Linen" +              "Second Linen" +              "Third Line";

String text = x > 5 ? "x > 5" : "x <= 5";

if (object instanceof Car) {}Car car = (Car) object;

if (object instanceof Car) {   Car car = (Car) object;}

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

int score = // some score;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";}

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) { }for (String item : collection) { }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>();map.put(1, "Amit");map.put(2, "Ali");map.put(3, "Mindorks");// Java 9final List<Integer> listOfNumber = List.of(1, 2, 3, 4);final Map<Integer, String> keyValue = Map.of(1, "Amit",                                             2, "Ali",                                             3, "Mindorks");

// Java 7 and belowfor (Car car : cars) {  System.out.println(car.speed);}// Java 8+cars.forEach(car -> System.out.println(car.speed));// Java 7 and belowfor (Car car : cars) {  if (car.speed > 100) {    System.out.println(car.speed);  }}// Java 8+cars.stream().filter(car -> car.speed > 100).forEach(car -> System.out.println(car.speed));

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

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

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

public class Utils {    private Utils() {       // This utility class is not publicly instantiable     }        public static int getScore(int value) {        return 2 * value;    }    }

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;    }        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 != null ? name.equals(developer.name) : developer.name == null;    }        public int hashCode() {        int result = name != null ? name.hashCode() : 0;        result = 31 * result + age;        return result;    }        public String toString() {        return "Developer{" +                "name='" + name + ''' +                ", age=" + age +                '}';    }}

public class Utils {    private Utils() {       // This utility class is not publicly instantiable     }        public static int triple(int value) {        return 3 * value;    }    }int result = Utils.triple(3);