1. Java? ?? ?? ?? ?? ??

?? ?? ?? ??? ???? ??? ????? ???? ??? ??? ??? ? ????. ?? ????? ??? ??? ??? ?????.

1.1 ???? var? ?????

Java?? var? ?? ??? ???? ??? ?? ?????. ???? ????. ??? ??, ??? ???? ?? ?? ??? ??? ? ????. ?? ??? ??? ????? ???? ????? ?? ??? ????? ?? ?????.

?:

var number = 10; // inferred as int
var message = "Hello, Java!"; // inferred as String

1.2 ?? ??? ??? ??????

Java? ?? ???? ?? ??? ??? ???? ?? ??? ?????. var? ?? ?? ???? ??? int? ?????. ???? ???? ???? ?????.

?:

var list = new ArrayList<String>(); // inferred as ArrayList<String>
list.add("Example");

?? ?? ??? ArrayList
??? ?????. **??? new ArrayList
?? ?????. ()
**.

1.3 var? ??? ??? ? ????

var? ?? ??? ???? ??? ???? ??? ? ????.

???? ?? ??:

public void exampleMethod() {
    var count = 5; // inferred as int
    var name = "Java"; // inferred as String
}

For ?? ??:

var numbers = List.of(1, 2, 3, 4, 5);
for (var number : numbers) {
    System.out.println(number);
}

try-with-resources? ?? ??:

try (var input = new FileInputStream("example.txt")) {
    // Do something with input
}

2. Java?? var? ???? ?? ? ?? ??

var? ???? ??? ??? ??? ??? ?? ???? ??? ? ?? ?? ??? ??? ?? ?? ??? ????.

2.1 ?? ??? ??

var ??? ?? ?? ? ??? ??? ???? ????? ????. ? ?? ??? ???? ?? ????? ?? ????? ?? ? ??? ??? ??? ? ????.

?:

Map<String, List<String>> userRoles = new HashMap<>(); // Verbose
var userRoles = new HashMap<String, List<String>>(); // Simplified

2.2 ?? ??? ??

?? ????? ??? ??? ??????? var? ???? ??? ? ???? ?? ?? ?? ? ????.

?:

var users = List.of("Alice", "Bob", "Charlie"); // Easier to read

??? ??? ?? ?? ?? ?? ?? ?????. ?:

var result = someMethod(); // What is the type of result?

??? ??? ???? ????? ?? ??? ?? ??? ??? ???? ??? ???? ??? ? ????.

3. var ?? ? ?? ?? ? ?? ??

var? ??? ????? ? ?? ??? ???? ??? ?????.

3.1 ???? ?? ??? ??

var? ???? ???? ?? ??? ???? ?? ?? ???? ??? ?????? ?? ?? ??? ???? ? ????.

?:

var number = 10; // inferred as int
var message = "Hello, Java!"; // inferred as String

??? factory.create()? ?? ??? ??? obj? ??? ????? ???? ?????.

3.2 ?? ??? ??? ? ??

var? ???, ??? ?? ?? ??? ?? ??? ?? ??? ?????. ?? ??? ??? ? ????:

• ??
• ??? ????
• ?? ??

??? ???? var? ????? ?? ??? ??? ?????.

?:

var list = new ArrayList<String>(); // inferred as ArrayList<String>
list.add("Example");

3.3 ?? ???

var? ?? ????? ?? ???? ??? ? ???? ?? ???? ???? ??? ? ????.

?:

public void exampleMethod() {
    var count = 5; // inferred as int
    var name = "Java"; // inferred as String
}

y? float?? ????? ? ??? ?? ???? ?? ??? ??? ? ????.

4. Java?? var? ????? ???? ??

var? ????? ????? ?? ?? ??? ?????.

4.1 ??? ??? ? var? ?????

??? ?? ??? ??? ?? var? ???? ??? ?? ???? ????? ??? ??? ? ? ????.

?:

var numbers = List.of(1, 2, 3, 4, 5);
for (var number : numbers) {
    System.out.println(number);
}

4.2 ??? ???? ?? ?? var? ???? ???.

?????? ??? ???? ?? ?? ?? ???? ????? var? ???? ???.

?:

try (var input = new FileInputStream("example.txt")) {
    // Do something with input
}

?? ???? ?????.

Map<String, List<String>> userRoles = new HashMap<>(); // Verbose
var userRoles = new HashMap<String, List<String>>(); // Simplified

4.3 var? ????? ????

???? ?????. ?? ?????? var? ????? ??? ?? ??? ??? ?? ????? ???? ???? ???? ???.

5. ??

var? ??? ?? ?? ?? ??? Java? ?? ???? ?? ????? ??? ??? ?? ? ????. ??? ???? ???? ???. var? ???? ?? ??? ???? ?? ??? ???? ?? ??? ?? ?? ?? ?? ???? ??? Java ??? ???? ? ?????. ?? ? ???? ??? ???????? ?? ?? ???? ???? ??????.

Java? var ???? ?? ??? ??? ? ??? ???? ??? ??? ??? ?????. ??? ??? ???? ?? ?????!

?? ??? ??? ??: Java? ?? ?? ?? ?? ???: var? ????? ???? ?? ???

? ??? Java? ??? ?? ?? ?? ??: var? ????? ???? ?? ???? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!