java - 设置菜单类时出错

Question

在 Android 中设置新菜单时，下面的 block 会抛出错误

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    // TODO Auto-generated method stub
    super.onListItemClick(l, v, position, id);
    String ncall = Classes[position];
    try {
        Class ourClass=Class.forName("com.example.newtrynow.", + ncall );
 \\above line shows error, why is "+" not supported its just appending the rest of string
        Intent ourIntent=new Intent(Menu.this, ourClass);
        startActivity(ourIntent);
    } catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

Answer 1

删除以下行中的逗号

Class ourClass=Class.forName("com.example.newtrynow.", + ncall );

应该是这样的

  Class ourClass=Class.forName("com.example.newtrynow." + ncall );