这道题：其实component在input里面都已经给好了，所有能一口气visit到的，全部加进queue里面，他们就是一个component里面的了 ...
> 原文:[https://www . geesforgeks . org/Java-program-to-check-undirected-graph-is-connected-use-DFS/](https://www.geeksforgeeks.org/java-program-to-check-whether ...
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