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import java.lang.reflect.Field;

/**
 * Created by 89742 on 7/19/2015.
 */
public class ReflectTest {
    
    public static void main(String[] args) throws Exception {

        ReflectPoint rp = new ReflectPoint();

        changeStringValue(rp);

        System.out.println(rp);

    }

    public static void changeStringValue(Object obj) throws Exception {
        Field[] fields = obj.getClass().getFields();

        for (Field field : fields) {

            System.out.print(field.getName());

            if (field.getType() == String.class) {

                String oldValue = (String) field.get(obj);

                String newValue = oldValue.replace("tangxin", "Michael");

                field.set(obj, newValue);
            }
        }

    }

}

/**
 * Created by 89742 on 7/18/2015.
 */

public class ReflectPoint {

    public String str1 = "tangxin.club";


    public String str2 = "tangxin.club";


    public String str3 = "tangxin.club";

    @Override
    public String toString() {
        return "ReflectPoint{" +
                "str1='" + str1 + '\'' +
                ", str2='" + str2 + '\'' +
                ", str3='" + str3 + '\'' +
                '}';
    }
}