The data type boolean is incompatible for converting into any other data type. That is, a boolean value cannot be converted into any other data type like char, int, double etc. The maximum permitted is one boolean can be assigned to another boolean. That is, boolean to byte is not possible.
Following are not permitted.
boolean b = true;
byte x = b; // error, boolean to byte
boolean b = true;
int x = b; // error, boolean to int
boolean b = true;
char ch = b; // error, boolean to char
char ch = 'A';
boolean b =ch; // error, char to boolean
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.
int x = 10;
int y = 20;
boolean b = (x == y);
System.out.println(b); // prints false
Let us write a simple example to see the compiler error message when boolean to byte is casted.
public class Conversions
{
public static void main(String args[])
{
boolean b1 = true;
byte b2 = b1; // error
System.out.println(b2);
}
}
Error message when boolean to byte casted
