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Debug 1:The method printIn(String) is undefined for the type PrintStream.Solution 1:println不是printIn。Debug 2:Exception in thread "main" java.lang.Error: Unresolved compilation problem.Solution 2:packa...

homework1-1package hw1; /* OpenCommercial.java */ import java.net.*; import java.io.*; import java.util.*;/*package for Arraylist /** A class that provides a main function to read five lines of a ...