下述程序执行后输出结果为（ ）。
public class TestMain {
public int test(){
int a = 0;
try{
a++;
throw new Exception("故意的");
}catch(Exception exa){
a++;
return a;
}finally{
a++;
System.out.println("a1 = "+a);
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
int a = new TestMain().test();
System.out.println("a2 = "+a);
}
}
