Question: please write a java code: In this problem the input file will have classes listed with their prerequisites. Your output.txt should list a valid order

please write a java code:

In this problem the input file will have classes listed with their prerequisites. Your output.txt should list a valid order for taking all of these classes while meeting all the prerequisites. You may assume there are no circular prerequisites (i.e. class A requires class B. Class B requires class C. Class C requires class A). You may assume all classes that are prerequisites of another are listed. The courses can be any string (not necessarily numbers) Sample input file (course identifier before :. Prerequisites after : with spaces between): 1001: 1133: 2011: 1933:1133 4041:1933 2011 Sample output.txt (valid class ordering with spaces between (no space after final class)): 1133 2011 1933 4041 1001

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