Type conversion, variable

Type conversion

```public class Demo03 {
    
    public static void main(String[] args) {
    
        int i = 128;
        //byte b = (byte) i; // out of memory 
        double b = i;

        // Coercive transformation  （ type ） Variable name   High to low 
        // Automatic conversion   Low to high 

        System.out.println(i);
        System.out.println(b);

        /*  Be careful  1. Cannot convert Boolean values  2. You cannot convert an object type to an unrelated type  3. Force conversion when converting high capacity to low capacity  4. There may be memory overflow during conversion , Or accuracy issues  */
        System.out.println("=====================");
        System.out.println((int)23.7); //23
        System.out.println((int)-45.89f); //-45

        System.out.println("=====================");
        char c = 'a';
        int d = c+1;
        System.out.println(d);
        System.out.println((char)d);
    }
}
 Output 
128
128.0
=====================
23
-45
=====================
98
b

Variable