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Commit37ea587

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Java第十二天
1 parentecaf465 commit37ea587

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2.24 MB
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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>

‎day12/code/day12_Scanner/.project‎

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>day12_Scanner</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.io.InputStream;
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importjava.util.Scanner;
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/*
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* Scanner:JDK5以后，用于帮助我们实现键盘录入数据的。
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*
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* 构造方法：
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* public Scanner(InputStream source)
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*/
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publicclassScannerDemo {
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publicstaticvoidmain(String[]args) {
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// 创建键盘录入对象
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// Scanner sc = new Scanner(System.in);
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// public Scanner(InputStream source)
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// System类下有这样的一个成员变量
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// public static final InputStream in;
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// InputStream is = System.in;
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// 假如Demo类下有一个变量
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// public static final int x;
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// public static final Student s;
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// int y = Demo.x;
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// Student student = Demo.s;
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// InputStream is = System.in; //子类对象
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// Scanner sc = new Scanner(is);
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Scannersc =newScanner(System.in);
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}
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}
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packagecn.itcast_02;
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importjava.util.Scanner;
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/*
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* 成员方法：
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* hasNextXxx():判断下一个输入项是不是指定的数据类型
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* nextXxx():获取该类型的数据
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*
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* 注意：
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* 键盘录入数据，需要的是int类型，我却给了一个字符串。
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* 在控制台就提示：InputMismatchException输入不匹配异常。
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*
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*/
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publicclassScannerDemo {
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publicstaticvoidmain(String[]args) {
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Scannersc =newScanner(System.in);
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System.out.println("请输入一个整数：");
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if (sc.hasNextInt()) {
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intnumber =sc.nextInt();
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System.out.println(number);
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}
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System.out.println("over");
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}
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}

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