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Java第二十二天
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‎day22/code/day22_IO/.classpath

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎day22/code/day22_IO/.project

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>day22_IO</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>

‎day22/code/day22_IO/.settings/org.eclipse.core.resources.prefs

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eclipse.preferences.version=1
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encoding//src/cn/itcast_12/JDK7Demo.java=UTF-8

‎day22/code/day22_IO/.settings/org.eclipse.jdt.core.prefs

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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

‎day22/code/day22_IO/a.txt

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package cn.itcast_01;
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import java.io.IOException;
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import java.io.Reader;
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public class MyBufferedReader {
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private Reader r;
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public MyBufferedReader(Reader r) { // Reader r = new FileReader("my.txt");
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this.r = r;
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}
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public String readLine() throws IOException {
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/*
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* ����������֪����r����r�����ȡ���������ַ�ʽ��һ�ζ�ȡһ���ַ���һ�ζ�ȡһ���ַ�����
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* ����׼�����ĸ���?���������ķ�ʽ�����Ȳ���ȷ�������ԣ�����ȷ��һ�ζ�ȡһ���ַ���
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* ����ÿ�ζ�ȡһ���ַ�������ȡ�ڶ����ַ���ʱ��ǰһ���ͻᶪʧ�����ԣ�����Ҫ��취�Ѷ�ȡ�����ַ�����������
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* ��ʲô��?ͨ���򵥵ķ�������������ȷ����StringBuilder
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*/
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StringBuilder sb = new StringBuilder();
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// while (true) {
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// // һ�ζ�ȡһ���ַ�
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// int ch = r.read();
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// if (ch == '\r') {
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// continue;
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// }
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// if (ch == '\n') {
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// // return sb.toString();
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// break;
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// } else {
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// sb.append((char) ch);
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// }
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// }
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// return sb.toString();
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// ��ν����ѭ��������?
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int ch = 0;
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while ((ch = r.read()) != -1) {
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if (ch == '\r') {
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continue;
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}
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if (ch == '\n') {
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return sb.toString();
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} else {
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sb.append((char) ch);
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}
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}
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// ��ֹ���ݶ�ʧ
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if (sb.length() > 0) {
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return sb.toString();
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}
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return null;
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}
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public void close() throws IOException {
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r.close();
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}
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}

‎day22/code/day22_IO/array.txt

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hello
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world
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java

‎day22/code/day22_IO/b.txt

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package cn.itcast_01;
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import java.io.IOException;
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import java.io.Reader;
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public class MyBufferedReader {
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private Reader r;
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public MyBufferedReader(Reader r) { // Reader r = new FileReader("my.txt");
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this.r = r;
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}
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public String readLine() throws IOException {
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/*
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* ����������֪����r����r�����ȡ���������ַ�ʽ��һ�ζ�ȡһ���ַ���һ�ζ�ȡһ���ַ�����
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* ����׼�����ĸ���?���������ķ�ʽ�����Ȳ���ȷ�������ԣ�����ȷ��һ�ζ�ȡһ���ַ���
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* ����ÿ�ζ�ȡһ���ַ�������ȡ�ڶ����ַ���ʱ��ǰһ���ͻᶪʧ�����ԣ�����Ҫ��취�Ѷ�ȡ�����ַ�����������
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* ��ʲô��?ͨ���򵥵ķ�������������ȷ����StringBuilder
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*/
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StringBuilder sb = new StringBuilder();
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// while (true) {
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// // һ�ζ�ȡһ���ַ�
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// int ch = r.read();
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// if (ch == '\r') {
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// continue;
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// }
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// if (ch == '\n') {
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// // return sb.toString();
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// break;
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// } else {
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// sb.append((char) ch);
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// }
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// }
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// return sb.toString();
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// ��ν����ѭ��������?
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int ch = 0;
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while ((ch = r.read()) != -1) {
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if (ch == '\r') {
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continue;
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}
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if (ch == '\n') {
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return sb.toString();
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} else {
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sb.append((char) ch);
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}
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}
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// ��ֹ���ݶ�ʧ
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if (sb.length() > 0) {
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return sb.toString();
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}
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return null;
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}
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public void close() throws IOException {
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r.close();
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}
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}

‎day22/code/day22_IO/bin/cn/itcast_01/MyBufferedReader.class

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‎day22/code/day22_IO/bin/cn/itcast_01/MyBufferedReaderDemo.class

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‎day22/code/day22_IO/bin/cn/itcast_02/LineNumberReaderDemo.class

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