Question

I have a pojo class

class Foo{
 String a
 String b
 .
 .
 // nearly 250 data members
 // all have getters and setter

}

Now when i create object of class
how can i check that any data member in object is blank

i am using following approach

public  boolean clearBlank()
{

    if(StringUtils.isBlank(this.getA()))
        return true;
    if(StringUtils.isBlank(this.getB()))
        return true;
    if(StringUtils.isBlank(this.getC()))
        return true;
    .
    .
    .
    // similarly for all 250 data member
    return false;

}

IS there any better approach intead of checking by calling all 250 getters of object?

Answer 1

Yes, you can use Java Reflection to go through all of the fields of the object and get their values to do the comparison.

Like this:

public static boolean hasBlankVariables(Object obj) throws IllegalArgumentException, IllegalAccessException {
    for (Field field : obj.getClass().getDeclaredFields()) {
        if (!field.isAccessible()) {
            field.setAccessible(true);
        }
        // Danger!
        String str = (String) field.get(obj);
        if (StringUtils.isBlank(str)) {
            return true;
        }
    }
    return false;
}