Description: the design issues- use Java language of instant communications system designed to better meet people's online chatting and the complete realization of the point-to-point between two computers exchange of information needs are raised. the current network is the result of rapid development. This paper is divided into seven parts. The first part of a simple analysis of the instant messaging system development feasibility, and the focus on the technical feasibility (choice of Java) have done a detailed analysis; The second part of using data flow diagram and data dictionary for the system's function and performance of a detailed needs analysis, established a system of logic structure; with the third part of the structure plan and the level of input and output processing of plans to es
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