如何在Java平台上使用脚本语言做Java开发(1)

def v1 = '66'      // sets the variable with a value of type String
println v1.dump()
// prints out:
// <java.lang.String@6c0 value=[6, 6] offset=0 count=2 hash=1728>

v1 = 9            // resets the variable with a value of type Integer
println v1.dump()
// prints out:
// <java.lang.Integer@9 value=9>

def v1 = '66'         // set v1 with a String typed value
def v2 = 5            // set v2 with a Integer typed value
def v3 = v1 + v2
println v3
// prints out: 
// 665

v1 = '66'              # set v1 with a String typed value
v2 = 5                 # set v2 with a Integer typed value
v3 = v1 + v2
# prints out:
# TypeError: cannot concatenate 'str' and 'int' objects

// the call back handler definition
interface IDataHandler {
public boolean onData(INonBlockingConnection nbc) throws IOException;

        }
// the server receives data and performs the handler's call back method
class MultithreadedServer {
private volatile boolean isRunning = true;
private IDataHandler dataHandler = null;

                // accepts only an object which implements the IDataHandler interface
MultithreadedServer(IDataHandler dataHandler) {
this.dataHandler = dataHandler;
}
public void run() {
while (isRunning) {
// waiting for data
// ...

// ... and dispatch it
dataHandler.onData(nbc);
}
}
}
// the call back implementation
class SmtpProtocolHandler implements IDataHandler {
public boolean onData(INonBlockingConnection nbc) throws IOException {
SmtpSession session = (SmtpSession) nbc.getAttachment();
//...
}
}

        MultithreadedServer server = new MultithreadedServer(new SmtpProtocolHandler());
server.run();