Textbook 235 Pages 2-3 Questions

 PackageOrg.hanqi.array;ImportJava.util.*; Public classXiti2 { Public Static voidMain (string[] args) {List<String> list=NewArraylist<string>(); List.add (A); List.add (A); List.add (C); List.add (C); List.add (A);  for(String s:list) {System.out.println (s); } System.out.println ("Set length =" +list.size ()); System.out.println ("List collection successfully added"); HashSet<string>s1=NewHashset<string>(); S1.add (A); S1.add (A); S1.add (C); S1.add (C); S1.add (A);  for(String t:s1) {System.out.println (t); } System.out.println ("Set length =" +s1.size ()); System.out.println ("Set collection cannot be added successfully"); }}

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 PackageOrg.hanqi.array;ImportJava.util.HashMap;ImportJava.util.Map; Public classEMP {PrivateString Key; PrivateString value;  PublicEmp (String key,string value) { This. key=key;  This. value=value; }     PublicString GetKey () {returnkey; }     Public voidSetkey (String key) { This. Key =key; }     PublicString GetValue () {returnvalue; }     Public voidSetValue (String value) { This. Value =value; }     Public Static voidMain (string[] args) {Map<string, string>m=NewHashmap<string, string>(); EMP EMP=NewEMP ("001", "Texas Braised Chicken"); EMP EMP2=NewEMP ("002", "Peking Roast Duck")); EMP Emp3=NewEMP ("003", "absolute duck Head"); EMP Emp4=NewEMP ("004", "Boshan pastry pot"); EMP EMP5=NewEMP ("005", "Wuhan Hot-Noodle"); EMP EMP6=NewEMP ("006", "Zhoucun pancake"); EMP EMP7=NewEMP ("007", "Zibo BBQ");        M.put (Emp.getkey (), Emp.getvalue ());        M.put (Emp2.getkey (), Emp2.getvalue ());        M.put (Emp3.getkey (), Emp3.getvalue ());        M.put (Emp4.getkey (), Emp4.getvalue ());        M.put (Emp5.getkey (), Emp5.getvalue ());        M.put (Emp6.getkey (), Emp6.getvalue ());                M.put (Emp7.getkey (), Emp7.getvalue ());        M.remove (EMP5);  for(String t:m.keyset ()) {if(t== "005") {m.remove (EMP5); }            Else{System.out.println (t); }        }    }}

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Textbook 235 Pages 2-3 Questions