double to boolean: The data type boolean is incompatible for converting into any other data type. That is, a boolean value cannot be converted (or assigned to) into any other data type like char, int, double, short etc. The maximum permitted is one boolean can be assigned to another boolean.
Following are not permitted.
double d1 = 10.5;
boolean b = d1; // error, double to boolean
boolean b = true;
double d1 = b; // error, boolean to double
char ch = 'A';
boolean b =ch; // error, char to boolean
boolean b = true;
int x = b; // error, boolean to int
Let us see what compiler says about double to boolean casting.
public class Conversions
{
public static void main(String args[])
{
double d1 = 10.5;
boolean b = d1; // error, double to boolean
System.out.println(b);
}
}
Compiler error screenshot of double to boolean Java
Following is permitted (boolean assignment).
boolean b = true;
boolean b1 = b; // permitted
System.out.println(b1); // prints true
The keyword boolean is used in comparison operations.
double x = 10.5;
double y = 20.5;
boolean b = (x == y);
System.out.println(b); // prints false
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