You can explicitly change the type of a value by casting. : Type Casting « Type Casting « SCJP

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SCJP » Type Casting » Type Casting 
4.1.1.You can explicitly change the type of a value by casting.
public class MainClass{
    public static void main(String[] argv){
        byte b = 0;
        int i = (int) b;
    
    }
}
4.1.Type Casting
4.1.1.You can explicitly change the type of a value by casting.
4.1.2.Change the object instance type
4.1.3.A widening conversion is a conversion from a smaller numeric type to a larger numeric type.
4.1.4.A narrowing conversion is a conversion from a larger numeric type to a smaller numeric type.
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