Solved: double to long

Java is a robust and flexible programming language, adaptable to various needs and utilized widely in the world of development. Among its numerous functionalities, one that stands out is the ability to convert data types. A classic example is the conversion of a ‘double’ data type into a long data type. This conversion can serve many purposes; chiefly, it allows for enhanced preservation of data integrity, reducing the chance of computational errors, which seem trivial but can gravely affect the results of an operation. Besides, these conversions can also pave the way for compatibility between different systems or modules.

The primary question that arises is – How does one make this conversion from ‘double’ to ‘long’?

Java Method – Double to Long Conversion

Java offers an inbuilt method to carry out this conversion; the method is straightforward and easy to use. This method is a part of the ‘java.lang.Double’ class and caters explicitly to the needs of this conversion.

double testDouble = 152.65;
long convertedLong = (long) testDouble;

In the above example, we have a double value stored in the variable ‘testDouble’. By simply putting ‘(long)’ before ‘testDouble’, Java understands it as a command to convert ‘testDouble’ to a long data type. The result of this operation is stored in ‘convertedLong’, which subsequently gets printed.

Step By Step Explanation of the Code

The code for this conversion is pretty simplistic and can be easily understood if broken down into parts.

1. Declaration of a double variable: We first declare a double variable ‘testDouble’ and assign it a value of 152.67.

double testDouble = 152.65;

2. Conversion to Long: This is achieved by specifying the data type we want to convert to, in parenthesis, before the variable that stores the value. In our case, this data type is long.

long convertedLong = (long) testDouble;

3. Output: Lastly, we use the System.out.println() command to print the converted value.


Other Libraries or Functions Involved

Java offers several other ways and methods that aid in data type conversions, some of them are:

  • Double.longValue(): This method returns the numeric value represented by this object after conversion to a long type.
  • Math.round(): This method can also be used for conversion, but it rounds the number to the nearest whole long.

Remember, while converting from a ‘double’ to a ‘long’, decimal values are truncated, and not rounded off. Proper handling and understanding of data type conversions is a crucial skill in Java programming, and, by extension, in development. It ensures your application runs smoothly, and the values generated are as expected, helping you achieve the desired results.

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