Java float Keyword
The Java float keyword is a primitive data types. The float data type is a single-precision 32-bit IEEE 754 floating point. Its default value is 0.0f and default size is 32 bits (4 byte). The range of a float value is 1.40239846 x 10-45 to 3.40282347 x 1038.
Example: Create a float value
In the example below, variable x and y are created to store float values. Please note that, value with an "f" is used to represent the float value.
public class MyClass {
public static void main(String[] args) {
//creating float values
float x = 10.5f;
float y = 10f;
//printing variables
System.out.println("x = " + x);
System.out.println("y = " + y);
}
}
The output of the above code will be:
x = 10.5 y = 10.0
Example: Widening Casting (smaller to larger type)
A float value can be created by assigning a byte, a short, an int or a long data to a float variable. The compiler implicitly typecast these data types to float as shown in the output.
public class MyClass {
public static void main(String[] args) {
byte num_byte = 10;
//Widening Casting
short num_short = num_byte;
int num_int = num_short;
long num_long = num_int;
float num_float = num_long;
//printing variables
System.out.println("num_byte = " + num_byte);
System.out.println("num_short = " + num_short);
System.out.println("num_int = " + num_int);
System.out.println("num_long = " + num_long);
System.out.println("num_float = " + num_float);
}
}
The output of the above code will be:
num_byte = 10 num_short = 10 num_int = 10 num_long = 10 num_float = 10.0
Example: Narrowing Casting (larger to smaller type)
For a larger data types like double, narrowing casting is required. The compiler explicitly typecast this data type to float as shown in the output.
public class MyClass {
public static void main(String[] args) {
double num_double = 10.5d;
//Narrowing Casting
float num_float = (float) num_double;
//printing variables
System.out.println("num_double = " + num_double);
System.out.println("num_float = " + num_float);
}
}
The output of the above code will be:
num_double = 10.5 num_float = 10.5
❮ Java Keywords
