[Java] A function that displays the size of a variable, such as sizeof

In C language, there is a function called sizeof as a function to check the size of a variable.

Is there any function or class in Java that acts like size of C?

If not, is there any way to print out the size of the variable?

2022-09-22 20:42

1 Answers

I don't have one.

The size of the variable is all objects except for the primary type. So it's an object, so it's a pointer to the variable c that points to the object. This size is the same, meaningless.

Below is the size of the primary type.

System.out.println("byte: " + Byte.BYTES);
System.out.println("char: " + Character.BYTES);
System.out.println("int: " + Integer.BYTES);
System.out.println("long: " + Long.BYTES);
System.out.println("short: " + Short.BYTES);
System.out.println("double: " + Double.BYTES);
System.out.println("float: " + Float.BYTES);

byte: 1
char: 2
int: 4
long: 8
short: 2
double: 8
float: 4

In Java, the array has .length and each collection (List, Map, etc.) is given a size method.

2022-09-22 20:42

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