运行客户端是出现下面的错误是怎么回事？？

1. Exception in thread "main" java.net.ConnectException: Connection refused: connect
   
2.         at java.net.DualStackPlainSocketImpl.connect0(Native Method)
   
3.         at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
   
4.         at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
   
5.         at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
   
6.         at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
   
7.         at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
   
8.         at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   
9.         at java.net.Socket.connect(Socket.java:579)
   
10.         at java.net.Socket.connect(Socket.java:528)
    
11.         at java.net.Socket.<init>(Socket.java:425)
    
12.         at java.net.Socket.<init>(Socket.java:208)
    
13.         at classmate.Client.main(Client.java:15)

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运行客户端是出现下面的错误是怎么回事？？

1. Exception in thread "main" java.net.ConnectException: Connection refused: connect
   
2.         at java.net.DualStackPlainSocketImpl.connect0(Native Method)
   
3.         at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
   
4.         at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
   
5.         at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
   
6.         at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
   
7.         at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
   
8.         at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   
9.         at java.net.Socket.connect(Socket.java:579)
   
10.         at java.net.Socket.connect(Socket.java:528)
    
11.         at java.net.Socket.<init>(Socket.java:425)
    
12.         at java.net.Socket.<init>(Socket.java:208)
    
13.         at classmate.Client.main(Client.java:15)

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