Java - Wrapper Classes
Which wrapper class method converts a
String to a double primitive in Java?Which wrapper class method converts a String to a double primitive in Java?
easy📝 Conceptual Q1 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the method for converting String to double primitive
The method Double.parseDouble(String s) converts a String to a double primitive.Step 2: Check other options for correctness
Double.valueOf(int i) returns a Double object, not a primitive. Integer.parseInt converts to int, not double. Float.parseFloat converts to float, not double.Final Answer:
Double.parseDouble(String s) -> Option BQuick Check:
String to double primitive = Double.parseDouble [OK]
Quick Trick: Use parseDouble for String to double primitive conversion [OK]
Common Mistakes:
- Confusing valueOf with parseDouble
- Using Integer.parseInt for double conversion
- Choosing Float.parseFloat instead of Double.parseDouble
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