08slideJava基础教程好.pptVIP

Objectives;Introduction(P262 8.1);Strings Are Immutable(8.2.2);Construct a String;Interned Strings;Interned Strings(8.2.2);Examples(8.2.2);Finding String Length(8.2.4);Retrieving Individual Character(8.2.4);Exercise 1;Exercise 2(P270 listing8.1);Exercise 3;Obtaining Substrings(8.2.6);Finding a Character or a Substring(8.2.8);Example;Finding a Character or a Substring(8.2.8);Example;Exercise 4;Exercise 5;Exercise 6;Exercise 7;String Comparisons(8.2.3);思考题;public boolean equals(Object anObject) { if (this == anObject) { return true; } if (anObject instanceof String) { String anotherString = (String)anObject; int n = count; if (n == anotherString.count) { char v1[] = value; char v2[] = anotherString.value; int i = offset; int j = anotherString.offset; while (n-- != 0) { if (v1[i++] != v2[j++]) return false; } return true; } } return false; };String Comparisons(8.2.3);Matching String(8.6.1);“.”代表任何字符 “\d”代表任何数字，“\D”代表任何非数字字符 “\s”代表空格，“\S”代表任何非空格字符 “x*”代表0个或多个x，（xy）*代表0个或多个xy “x?”代表0个或1个x，（xy）?代表0个或1个xy “x+”代表1个或多个x，（xy）+代表1个或多个xy [xyz]表示取x，y，z其中一个 [0-9]表示取0-9其中一个 x|y|z表示取x，y，z其中一个 “x{5}”表示5个x “x{5，}”表示至少5个x “x{5，8}”表示至少5个x，最多8个x （xyz）{2}表示xyz出现两次 ;Exercise 8;Exercise 9;String Conversions(8.2.7);Split string;Convert Character and Numbers to Strings(8.2.10);Exercise 10;The StringBuffer Class(P273 8.4);StringBuffer Constructors;Appending New Contentsinto a String Buffer;insert New Contentsinto a String Buffer;delete Contentsfrom a String Buffer;modify String Buffer;Exercise 15;Exercise 16;The Character Class;Example;Example;Example;Example;Exercise 11;Exercise 12;Exercise 13;Exercise 14;The File Class;52;import java.io.*; public class TestFileClass { public static void main(String[] args) { File file = new File(“d:/image/us.gif); System.out.println(Does it exist? + file.exists()); System.out.println(Can it be read? + file.canRead()); System.out.println(Can it be written? + file.canWrite());