a fast google search popped up this example https://www.mkyong.com/java8/java-8-stream-read-a-file-line-by-line/.
for each line you get a String. split the string on whitespace:
String[] lineArr = line.split(" ");
Then use the 3 values in the array to create your stuff. easy peasy 🙂
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solved Taking input of a graph from text file in java till the end of file [closed]