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Commit4bc7b98

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Java第十七天
1 parent36c0c37 commit4bc7b98

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1��Collection������ϵ�ṹ
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Collection
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|--List(Ԫ�����򣬿��ظ�)
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|--ArrayList
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|--Vector
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|--LinkedList
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�̲߳���ȫ,Ч�ʸ�
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|--Set(Ԫ������Ψһ)
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|--HashSet
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�ײ����ݽṹ�ǹ�ϣ����
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������������hashCode()��equals()��
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|--LinkedHashSet
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|--TreeSet
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�ǣ�TreeSet
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��HashSet
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��֪��������HashSet
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��List
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Ҫ��ȫ��?
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Ҫ��Vector(��ʵҲ���ã��и��õķ�ʽ�����潲)
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��Ҫ��ArrayList����LinkedList
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��ѯ�ࣺArrayList
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��ɾ�ࣺLinkedList
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ArrayXxx:�ײ����ݽṹ�����飬��ѯ�죬��ɾ��
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LinkedXxx:�ײ����ݽṹ����������ѯ������ɾ��
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HashXxx:�ײ����ݽṹ�ǹ�ϣ����������������hashCode()��equals()���������ѡ���Ƿ��Զ���д
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TreeXxx:�ײ����ݽṹ�Ƕ������������ַ�������Ȼ���򣬱Ƚ�������
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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentrykind="src"path="src"/>
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<classpathentrykind="con"path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
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<classpathentrykind="output"path="bin"/>
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</classpath>
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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>day17_List_test</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>
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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
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org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
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org.eclipse.jdt.core.compiler.compliance=1.7
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org.eclipse.jdt.core.compiler.debug.lineNumber=generate
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org.eclipse.jdt.core.compiler.debug.localVariable=generate
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org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
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org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
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org.eclipse.jdt.core.compiler.source=1.7
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packagecn.itcast_01;
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importjava.util.ArrayList;
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/*
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* 需求：获取10个1-20之间的随机数，要求不能重复
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*
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* 分析：
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* A:定义一个集合，用于存储产生的随机数
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* B:定义一个统计变量，初始值是0
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* C:判断统计变量是否小于10
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* 是：
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* 产生一个随机，然后判断是在集合中
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* 是：不添加
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* 否：添加到集合
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* 否：结束
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* D:遍历集合
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*/
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publicclassRandomNumberDemo {
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publicstaticvoidmain(String[]args) {
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// 定义一个集合，用于存储产生的随机数
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ArrayList<Integer>array =newArrayList<Integer>();
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// 定义一个统计变量，初始值是0
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intcount =0;
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// 判断统计遍历是否小于10
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while (count <10) {
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// 产生一个随机，然后判断是在集合中
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intrandomNumber = (int) (Math.random() *20) +1;
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if (!array.contains(randomNumber)) {
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array.add(randomNumber);
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count++;
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}
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}
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// 遍历集合
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for (Integeri :array) {
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System.out.println(i);
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}
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}
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}

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