Get value of String variable via reflection

Question

I have a POJO with loads of Strings and I want an easy method to check if they are all empty / contain a certain character / whatever.

I get the String variables with this:

    Field[] fields = this.getClass().getDeclaredFields();

    for (Field f : fields) {

        if (f.getType() == java.lang.String.class) {
            Log.d("REF", "Field: " + f.getName());
        }

    }

but I don't know how to get the String value of the Field. How is it done?

anubhava · Accepted Answer · 2013-06-28 09:04:43Z

5

You need to call:

Object val = f.get(this);

OR to get String object:

String strval = (String) f.get(this);

to get field represented by f's value.

See: Field#Get(Object)

Also: Getting and Setting Field Values

answered Jun 28, 2013 at 9:04

anubhava

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Abubakkar · Accepted Answer · 2013-06-28 09:05:34Z

2

You can try this code to get the value :

for (Field f : fields) {
   if (f.getType() == java.lang.String.class) {
        Log.d("REF", "Field: " + f.getName());
        String s = (String)f.get(this);
   }
}

answered Jun 28, 2013 at 9:05

Abubakkar

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Comments

PermGenError · Accepted Answer · 2013-06-28 09:06:36Z

2

For any object you should use Field#get(Object) method. as String is an object in java thus :

        String str = (String)f.get(this);

answered Jun 28, 2013 at 9:06

PermGenError

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