Java | Фишки и трюки

GET /api/resource HTTP/1.1
Host: example.com
Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvZSBEb2UiLCJhZG1pbiI6dHJ1ZSwiaWF0IjoxNTE2MjM5MDIyfQ.SdUMMAsFFk83SHyqGjfQ1pt8v_8t4WZku5Ty3CLMaH4

POST /login HTTP/1.1
Host: example.com
Content-Type: application/json
Content-Length: 52

{
    "username": "admin",
    "password": "admin"
}

{"token":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvZSBEb2UiLCJhZG1pbiI6dHJ1ZSwiaWF0IjoxNTE2MjM5MDIyfQ.SdUMMAsFFk83SHyqGjfQ1pt8v_8t4WZku5Ty3CLMaH4","username":"admin"}

for (initialization; condition; update) {
    // тело цикла
}

int[] numbers = {1, 2, 3, 4, 5};
for (int i = 0; i < numbers.length; i++) {
    System.out.println(i + ": " + numbers[i]);
}

for (type element : collection) {
    // тело цикла
}

int[] numbers = {1, 2, 3, 4, 5};
for (int number : numbers) {
    System.out.println(number);
}

while (condition) {
    // тело цикла
}

String code = UUID.randomUUID().toString();
boolean isCodeExists = repo.isCodeExists(code);
while (isCodeExists) {
    code = UUID.randomUUID().toString();
    isCodeExists = repo.isCodeExists(code);
}
repo.saveCode(code);

do {
    // тело цикла
} while (condition);

String command;
do {
    command = readCommand();
    doCommand(command);
} while (!"EXIT".equals(command));

class Base {
    public String className = "Base";

    public String getClassName() {
        return className;
    }
}

class Derived extends Base {
    public String className = "Derived";
}

public class Quest {
    public static void main(String[] args) {
        System.out.println(new Derived().getClassName());
    }
}

var list1 = List.of("apple", "banana", "cherry");
var list2 = List.of("orange", "pineapple", "mango");

var result = Stream.concat(list1.stream(), list2.stream())
        .filter(s -> s.length() > 5)
        .toList();

System.out.println(result);
// [banana, cherry, orange, pineapple]

super.method();

class Dog {
    public static void bark() {
        System.out.print("Woof ");
    }
}

class Basenji extends Dog {
    public static void bark() { }
}

public class Bark {
    public static void main(String[] args) {
        Dog woofer = new Dog();
        Dog nipper = new Basenji();
        woofer.bark();
        nipper.bark();
    }
}