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7 / 10Java-literals and and wrapper classesHardJava

Consider the following code:

Integer x = Integer.valueOf("10");
Integer y = Integer.valueOf("10");
System.out.println(x == y);

What is the output, assuming default JVM settings?

  1. true

  2. false

  3. NumberFormatException

  4. Compilation error

Show answer & explanation

Correct answer

true

Explanation

`Integer.valueOf()` caches values from -128 to 127. Since 10 is within that range, both calls return the same cached instance, so `x == y` is `true`.

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All 10 Java-literals and and wrapper classes questions

  1. 1.Which of the following is a valid octal literal in Java, and when assigned to an `int`, produces the decimal value 63?
  2. 2.Given `Integer a = 100; Integer b = 100; Integer c = 200; Integer d = 200;`, which expression evaluates to `true`?
  3. 3.What is the result of the following operation?
  4. 4.Which of the following statements about Java's `Float` wrapper class is correct?
  5. 5.What is the decimal value of the Java literal `0xFFFF_FFFF` when assigned to an `int`?
  6. 6.Which of the following is a valid Java literal for a `double` and demonstrates the use of scientific notation with an exponent?
  7. 7.Consider the following code:
  8. 8.Which of the following Java literals is NOT a valid way to represent the integer value 256?
  9. 9.Given `Short s = 5;` which of the following expressions is allowed without explicit casting?
  10. 10.What is the output of the following?