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🕕 Задача по Java: Что будет выведено?


public class Main {
public static void main(String[] args) {
Integer a = 127;
Integer b = 127;
Integer c = 128;
Integer d = 128;

System.out.println(a == b); // ?
System.out.println(c == d); // ?
}
}


Варианты:
A) true, true
B) true, false
C) false, true
D) false, false

Правильный ответ: B

Объяснение:
Java кэширует объекты Integer в диапазоне -128 ... 127.
a == b — то же значение и тот же объект.
c == d — разные объекты вне кэша. Используй .equals() для сравнения!



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🕕 Задача по Java: Что будет выведено?


public class Main {
public static void main(String[] args) {
Integer a = 127;
Integer b = 127;
Integer c = 128;
Integer d = 128;

System.out.println(a == b); // ?
System.out.println(c == d); // ?
}
}


Варианты:
A) true, true
B) true, false
C) false, true
D) false, false

Правильный ответ: B

Объяснение:
Java кэширует объекты Integer в диапазоне -128 ... 127.
a == b — то же значение и тот же объект.
c == d — разные объекты вне кэша. Используй .equals() для сравнения!

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