《Java语言程序设计(基础篇)》(第10版 梁勇 著)第二十一章练习题.pdfVIP

Java语言程序设计（基础篇）》（第10版梁勇著）

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第二十一章练习题答案

21.1

importjava.util.*;

publicclassExercise21_01{

publicstaticvoidmain(String[]args){

LinkedHashSetStringset1=newLinkedHashSetString(Arrays.asList(

newString[]{George,Jim,John,Blake,Kevin,Michael}));

LinkedHashSetStringset1Clone1=(LinkedHashSetString)set1.clone();

LinkedHashSetStringset1Clone2=(LinkedHashSetString)set1.clone();

LinkedHashSetStringset2=newLinkedHashSetString(Arrays.asList(

newString[]{George,Katie,Kevin,Michelle,Ryan}));

set1.addAll(set2);

set1Clone1.removeAll(set2);

set1Clone2.retainAll(set2);

System.out.println(Theunionofthetwosetsis+set1);

System.out.println(Thedifferenceofthetwosetsis+set1Clone1);

System.out.println(Theintersectionofthetwosetsis+set1Clone2);

}

}

21.1附加

importjava.util.*;

publicclassExercise21_01Extra{

publicstaticvoidmain(String[]args){

System.out.print(Enterastring:);

Scannerinput=newScanner(System.in);

Strings=input.nextLine();

Character[]list1={A,E,I,O,U};

SetCharactervowels=newHashSet(Arrays.asList(list1));

SetCharactervowelsInString=newHashSet();

SetCharacterconsonantsInString=newHashSet();

intnumbeOfVowels=0;

intnumbeOfConsonants=0;

for(inti=0;is.length();i++){

charch=Character.toUpperCase(s.charAt(i));

if(Character.isLetter(ch)){

if(vowels.contains(ch)){

if(!vowelsInString.contains(ch)){

vowelsInString.add(ch);

numbeOfVowels++;

}

}

elseif(!consonantsInString.contains(ch)){

consonantsInString.add(ch);

numbeOfConsonants++;

}

}

}

System.out.println(Thenumbe