I have one simple question, Where we need the count of the variables in an Object:
class cot{ int I; int j; int k; }
We need the count of the variables (3) for each iteration on cot[], we have size() which we can use for getting size of Array List of Object. But how to find the count of the Variables for each Iteration on the Object.
We know it is three , But need for dynamic Objects.
You can use Reflection API. Here is an example:
import java.lang.reflect.Field;
public class cot{
int I; int j; int k;
String str;
public int CountAllVariables(){
// get reference to own class
Class<?> clazz = this.getClass();
// return amount of all fields
return clazz.getDeclaredFields().length;
}
public int CountAllInteger(){
int result = 0;
// get reference to own class
Class<?> clazz = this.getClass();
// check all fields
for ( Field field : clazz.getDeclaredFields() ) {
// count if it is an int field
if(int.class.isAssignableFrom(field.getType()))
result++;
}
return result;
}
}
Now you can use it like this:
public static void main(String[] args){
cot c = new cot();
System.out.println( c.CountAllInteger()); // prints 3
System.out.println( c.CountAllVariables()); // prints 4
}
