Computer Applications
Which of the following is the correct method to convert a String to a double in Java?
Java Library Classes
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Answer
Double.parseDouble(String)
Reason — Double.parseDouble(String) method converts a String representation of a number into a primitive double.
Analysing other options:
String.toDouble()— Incorrect. This method does not exist in Java.Double.parseDouble()— Incorrect. This is syntactically incomplete, as it requires aStringargument.Double.valueOf(String)— Incorrect. This converts theStringto aDoubleobject, not a primitivedouble.
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Related Questions
The method to convert a String to double is:
- String.toDouble()
- Double.Parsedouble()
- Double.parseDouble(String)
- Double.parseDouble()
Primitive data types are built in data types which are a part of the wrapper classes. These wrapper classes are encapsulated in the java.lang package. Non primitive datatypes like Scanner class are a part of the utility package for which an object needs to be created.
(a) To which package the Character and Boolean classes belong?
(b) Write the statement to access the Scanner class in the program.