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4 / 10Java-variables and data typesHardJava

Given:

Integer i1 = 127;
Integer i2 = 127;
Integer i3 = 128;
Integer i4 = 128;

Which comparison yields `true`?

  1. i1 == i2

  2. i3 == i4

  3. i1 == i3

  4. i2.equals(i4)

  5. i1.equals(i2)

Show answer & explanation

Correct answer

i1 == i2

Explanation

Java caches `Integer` objects for values between -128 and 127 inclusive. Thus `i1 == i2` refers to the same cached object, so `true`. For 128, new objects are created, so `i3 == i4` is `false`. `.equals()` compares values and is `true` for both.

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