Computer Applications
Which of the following is the correct method to convert a String to a double in Java?
Java Library Classes
1 Like
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.
Answered By
1 Like
Related Questions
A student is trying to convert the string present in x to a numerical value, so that he can find the square root of the converted value. However the code has an error. Name the error (syntax / logical / runtime). Correct the code so that it compiles and runs correctly.
String x= "25"; int y=Double.parseDouble(x); double r=Math.sqrt(y); System.out.println(r);Differentiate between boxing and unboxing.
Assertion (A): Integer class can be used in the program without calling a package.
Reason (R): It belongs to the default package java.lang.
- Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A)
- Both Assertion (A) and Reason (R) are true and Reason (R) is not a correct explanation of Assertion(A)
- Assertion (A) is true and Reason (R) is false
- Assertion (A) is false and Reason (R) is true
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.