How to Convert a Double to an Int in Java

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Summary: Learn how to convert a double to an int in Java using various methods including type casting and rounding functions to handle different conversion needs.
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Overview of Double to Int Conversion in Java

In Java, converting a double (a double-precision 64-bit IEEE 754 floating point) to an int (a 32-bit integer) is a common task that can be required in various scenarios, such as graphical calculations, truncating values from calculations that produce floating-point results, or simply due to API requirements that necessitate integers. Converting a double to an int involves either truncating the decimal part or rounding the number to the nearest integer. It is essential to handle this conversion carefully to avoid loss of information or unintended behavior.

Method 1: Type Casting

The simplest way to convert a double to an int in Java is by using type casting. This method truncates the decimal part of the double and returns the integer part.

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Output:

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Type casting is straightforward and fast but simply removes the fractional part, which might not be suitable when precision in rounding is needed.

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Output:

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This method is more appropriate than simple type casting when accuracy in rounding to the nearest whole number is required.

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Output:

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These methods are useful when specific rounding behaviors are required, such as in graphical applications where dimensions need to be whole numbers but must either fully contain or exclude a spatial entity.

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