如何Java8 Lambda表達式轉換成相應的Java7代碼

Question

我一直想知道如何轉換lambda表達式（這是Java8最大的語言功能）以下爲相應的Java 7

final JmsBolt jmsBolt = new JmsBolt(); 
jmsBolt.setJmsMessageProducer((session, input) -> { 
     final String json = "{\"stateCode\":\"" + input.getString(0) + "\", \"sentiment\":" + input.getInteger(1) + "}"; 
     return session.createTextMessage(json); 

這是JmsBolt類：

public class JmsBolt extends BaseRichBolt { 

... 
public void setJmsMessageProducer(JmsMessageProducer producer){ 
    this.producer = producer; 
} 
... 
} 

這裏是JmsMessageProducer功能接口：

public interface JmsMessageProducer extends Serializable{ 

public Message toMessage(Session session, Tuple input) throws JMSException; 
} 

Answer 1

我認爲一個匿名類會幫助你：

jmsBolt.setJmsMessageProducer(new JmsMessageProducer() { 

    @Override 
    public Message toMessage(Session session, Tuple input) { 
     ... 
    } 

});