The numeric types are not compatible with char or boolean

public class Main{
   public static void main(String[] argv){
      char ch = 'a';
      int num = 99;
      ch = num ;
    }
}

Compiling the code above will generate the following error message.

char and boolean are not compatible with each other.

public class Main {
  public static void main(String[] argv) {
    char ch = 'a';
    int num = 99;
    ch = num;
  }
}

Compiling the code above will generate the following error message.

D:\>javac Main.java
Main.java:5: possible loss of precision
found   : int
required: char
    ch = num;
         ^
1 error

Java performs an automatic type conversion when storing a literal integer constant into variables of type byte, short, or long.

public class Main {
  public static void main(String[] argv) {
    byte b = 1;
  }
}

But you cannot store a value out of the byte scope

public class Main{
   public static void main(String[] argv){
      byte b = 11111;
    }
}

When compiling, it generates the following error message:

D:\>javac Main.java
Main.java:3: possible loss of precision
found   : int
required: byte
      byte b = 11111;
               ^
1 error