能够写出这样的代码， 其实体现了水平

switch (state) {

case 0:

break;

case 3:

return; // already connected

case 4:

state = 0;

throw new TransportException( "Connection in error", te );

default:

TransportException te = new TransportException( "Invalid state: " + state );

state = 0;

throw te;

}