A Java applet or application can open a socket to a Java server application through the Socket class.
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Socket t = new Socket("internet host name", port)
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or Socket t = new Socket(this.getCodeBase().getHost(), port)
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The latter form is useful for applets as the applet can only use a socket to a server application running on the web host machine that the applet code was downloaded from.
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Sockets have methods getInputStream and getOutputStream which can be used for communication. Note that both communication directions are possible at the same time on a socket.
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