If you lot own got simply started learning Java in addition to came from C background in addition to therefore you lot mightiness own got noticed about divergence betwixt Java in addition to C programming language, e.g., String is an object inward Java in addition to non a NULL-terminated graphic symbol array. Similarly, in that place is is no sizeof() operator inward Java. All primitive values own got predefined size, e.g., int is four bytes, char is ii byte, curt is ii byte, long in addition to float is 8 byte in addition to therefore on. But if you lot are missing sizeOf operator in addition to therefore why non let's acquire far a coding task? If you lot are Ok, in addition to therefore your side past times side chore is to write a method inward Java, which tin post away comport similar sizeOf() operator/function of C in addition to returns the size inward bytes for each primitive numeric types, i.e. all primitive types except boolean.
Many of you lot think, why nosotros are non including boolean? Isn't that it simply demand one fleck to stand upward for truthful in addition to simulated value? Well, I am nog, including boolean inward this do because the size of boolean is non strictly defined inward Java specification in addition to varies betwixt unlike JVM (See 75 Coding Problems to Crack Any Programming Job interview, drib a banker's complaint if this is interesting in addition to challenging.
Many of you lot think, why nosotros are non including boolean? Isn't that it simply demand one fleck to stand upward for truthful in addition to simulated value? Well, I am nog, including boolean inward this do because the size of boolean is non strictly defined inward Java specification in addition to varies betwixt unlike JVM (See 75 Coding Problems to Crack Any Programming Job interview, drib a banker's complaint if this is interesting in addition to challenging.
Java sizeof() business office Example
Here is our consummate Java programme to implement the sizeof operator. It's non precisely the size, but its purpose is the same. sizeof returns how much retentivity a item information type takes, in addition to this method does precisely that./** * Java Program to impress size of primitive information types e.g. byte, int, short, double, float * char, curt etc, inward a method similar C programming language's sizeof * * @author Javin Paul */ public class SizeOf{ public static void main(String args[]) { System.out.println(" size of byte inward Java is (in bytes) : " + sizeof(byte.class)); System.out.println(" size of curt inward Java is (in bytes) :" + sizeof(short.class)); System.out.println(" size of char inward Java is (in bytes) :" + sizeof(char.class)); System.out.println(" size of int inward Java is (in bytes) :" + sizeof(int.class)); System.out.println(" size of long inward Java is (in bytes) :" + sizeof(long.class)); System.out.println(" size of float inward Java is (in bytes) :" + sizeof(float.class)); System.out.println(" size of double inward Java is (in bytes) :" + sizeof(double.class)); } /* * Java method to render size of primitive information type based on difficult coded values * valid but provided past times developer */ public static int sizeof(Class dataType) { if (dataType == null) { throw new NullPointerException(); } if (dataType == byte.class || dataType == Byte.class) { return 1; } if (dataType == short.class || dataType == Short.class) { return 2; } if (dataType == char.class || dataType == Character.class) { return 2; } if (dataType == int.class || dataType == Integer.class) { return 4; } if (dataType == long.class || dataType == Long.class) { return 8; } if (dataType == float.class || dataType == Float.class) { return 4; } if (dataType == double.class || dataType == Double.class) { return 8; } return 4; // default for 32-bit retentivity pointer } /* * H5N1 perfect agency of creating confusing method name, sizeof in addition to sizeOf * this method accept wages of SIZE constant from wrapper class */ public static int sizeOf(Class dataType) { if (dataType == null) { throw new NullPointerException(); } if (dataType == byte.class || dataType == Byte.class) { return Byte.SIZE; } if (dataType == short.class || dataType == Short.class) { return Short.SIZE; } if (dataType == char.class || dataType == Character.class) { return Character.SIZE; } if (dataType == int.class || dataType == Integer.class) { return Integer.SIZE; } if (dataType == long.class || dataType == Long.class) { return Long.SIZE; } if (dataType == float.class || dataType == Float.class) { return Float.SIZE; } if (dataType == double.class || dataType == Double.class) { return Double.SIZE; } return 4; // default for 32-bit retentivity pointer } } Output: size of byte inward Java is (in bytes) : 1 size of short inward Java is (in bytes) :2 size of char inward Java is (in bytes) :2 size of int inward Java is (in bytes) :4 size of long inward Java is (in bytes) :8 size of float inward Java is (in bytes) :4 size of double inward Java is (in bytes) :8
That's all inward this programming do of writing a sizeof similar a method inward Java. This is truly tricky because, you lot don't intend of taking wages of the pre-defined size of Java information types, neither you lot intend well-nigh taking wages of SIZE constants defined inward wrapper classes, e.g. Integer or Double. Well, if you lot tin post away come upward across whatever other agency of finding the size of primitive information type in addition to therefore allow us know.
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Thanks for reading this article therefore far. If you lot similar this coding or algorithm interview enquiry in addition to my explanation in addition to therefore delight portion alongside your friends in addition to colleagues. If you lot own got whatever incertitude or feedback in addition to therefore delight drib a note.
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