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Commitd710a8f

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Java第二十四天
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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>

‎day24/code/day24_Pattern/.project‎

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>day24_Pattern</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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/*
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* 设计模式：经验的总结。是一套模型。
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*
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* 分类：
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*创建型模式
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*行为型模式
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*结构型模式
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*
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* 单例模式：保证类在内存中只有一个对象。
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* 举例：
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* windows打印机，网站计数器
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*
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* 如何能够保证类在内存中只有一个对象呢?
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* A:让外界不能创建对象
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* 构造私有
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* B:本身提供一个对象
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* 在成员位置创建对象
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* C:对外提供公共的访问方式
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* 写一个公共方法即可
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*/
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publicclassSingletDemo {
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publicstaticvoidmain(String[]args) {
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// Student s1 = new Student();
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// Student s2 = new Student();
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// System.out.println(s1 == s2);
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// Student.s = null;
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Students1 =Student.getStudent();
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Students2 =Student.getStudent();
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System.out.println(s1 ==s2);
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}
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}
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packagecn.itcast_01;
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publicclassStudent {
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// 构造私有
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privateStudent() {
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}
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// 本身创建
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// 静态只能访问静态,加static
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// 为了不让外加访问，加private
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privatestaticStudents =newStudent();
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// 提供公共访问
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// 为了让外界可以直接访问，加static
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publicstaticStudentgetStudent() {
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returns;
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}
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}

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