PropertyDescriptor獲取非標准java bean屬性的getter和setter時候的一個問題

import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.junit.Test;

public class Main {
    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        Main main = new Main();
        Hello hello = new Hello();
        List<String> list = new ArrayList<String>();
        list.add("phone");
        list.add("Android");
        list.add("WIFI");
        list.add("isGood");
        /*
         * 出現錯誤：
         * Exception in thread "main" java.beans.IntrospectionException: Method not found: isASdf
         * at java.beans.PropertyDescriptor.<init>(Unknown Source)
         * at java.beans.PropertyDescriptor.<init>(Unknown Source)
         * at hello.Main.getMethod(Main.java:34)
         * at hello.Main.main(Main.java:28)
         */
        list.add("aSdf");
        list.add("Nokia");
        list.add("canCrackWalnuts");
        list.add("isUsable");
        for(String str : list) {
            main.getMethod(str, hello);
        }
    }
    
    
    public void getMethod(String name, Object obj) throws Exception {
        String field = name;
        PropertyDescriptor desc = new PropertyDescriptor(field, obj.getClass());
        Method method = desc.getReadMethod();
        System.out.println(method.invoke(obj));
        Method setMethod = desc.getWriteMethod();
        System.out.printf("%s\r\n", method);
        System.out.printf("%s\r\n", method.invoke(obj));
        System.out.printf("%s\r\n", setMethod);
    }
    
    

}

class Hello {
    String phone;
    String Android;
    String WIFI;
    String isGood;
    String Nokia;
    String aSdf;
    boolean isUsable;
    boolean canCrackWalnuts;
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getAndroid() {
        return Android;
    }
    public void setAndroid(String android) {
        Android = android;
    }
    public String getWIFI() {
        return WIFI;
    }
    public void setWIFI(String wIFI) {
        WIFI = wIFI;
    }
    public String getIsGood() {
        return isGood;
    }
    public void setIsGood(String isGood) {
        this.isGood = isGood;
    }
    public String getNokia() {
        return Nokia;
    }
    public void setNokia(String nokia) {
        Nokia = nokia;
    }
    /**
     * 並不是getASdf
     * @return
     */
    public String getaSdf() {
        return aSdf;
    }
    public void setaSdf(String aSdf) {
        this.aSdf = aSdf;
    }
    
    /**
     * 並不是isIsUsable
     * @return
     */
    public boolean isUsable() {
        return isUsable;
    }
    public void setUsable(boolean isUsable) {
        this.isUsable = isUsable;
    }
    public boolean isCanCrackWalnuts() {
        return canCrackWalnuts;
    }
    public void setCanCrackWalnuts(boolean canCrackWalnuts) {
        this.canCrackWalnuts = canCrackWalnuts;
    }
    @Override
    public String toString() {
        return "Hello [phone=" + phone + ", Android=" + Android + ", WIFI=" + WIFI + ", isGood=" + isGood + ", Nokia="
                + Nokia + ", aSdf=" + aSdf + ", isUsable=" + isUsable + ", canCrackWalnuts=" + canCrackWalnuts + "]";
    }
    
}