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 etc. The maximum permitted is one boolean can be assigned to another boolean. char to boolean is not possible.
Following are not permitted.
boolean b = true;
char ch = b; // error, boolean to char
char ch = 'A';
boolean b =ch; // error, char to boolean
boolean b = true;
int x = b; // error, boolean to int
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 try to convert char to boolean and observe the compiler message.
public class Conversions
{
public static void main(String args[])
{
char ch = 'A';
boolean b1 = ch; // compiler error
System.out.println(b1);
}
}
Output screenshot of char to boolean Java
