Java程序設(shè)計(jì)

1、實(shí)訓(xùn)4字符串類【目的】掌握String類的常用方法【內(nèi)容】String類的常用方法。實(shí)訓(xùn)要求：編寫一個(gè)Java應(yīng)用程序，判斷兩個(gè)字符串是否相同，判斷字符串的前綴、后綴是否和某個(gè)字符串相同，按字典順序比較兩個(gè)字符串的大小關(guān)系，檢索字符串，創(chuàng)建字符串，將數(shù)字型字符串轉(zhuǎn)換為數(shù)字，將字符串存放到數(shù)組中，用字符數(shù)組創(chuàng)建字符串。程序運(yùn)行效果示例：程序運(yùn)行效果如下圖所示：程序模板：StringExample.javaclass StringExample public static void main(String args) String s1=new String(you are a student),

2、s2=new String(how are you);if(s1.equals(s2)/使用equals方法判斷s1與s2是否相同System.out.println(s1 與 s2 相同);elseSystem.out.println(s1 與 s2 不相同);String s3=new String(22030219851022024);if( s3 != null & !.equals(s3)判斷 s3 的前綴是否是“ 220302”。System.out.println(” 吉林省的身份證);String s4=new String(你), s5=new String(我);jf( t

3、his.charAt(s4)-anotherString.charAt(s5)/按著字典序 S4 大于 S5 的表達(dá)式。System.out.println(” 按字典序 s4 大于 s5);elseSystem.out.println(” 按字典序 s4 小于 s5);int position=0;String path=c:javajspA.java;position= indexOf(”,6); /獲取path中最后出現(xiàn)目錄分隔符號(hào)的位置 System.out.println(c:javajspA.java 中最后出現(xiàn)的位置：+position);String fileName=path

4、. getChars(12,18,A,0)獲取 path 中“ A.java”子字符串 System.out.println(c:javajspA.java 中含有的文件名:+fileName);String s6=new String(100),s7=new String(123.678);int n1= Integer.parseln(s6);/將 s6轉(zhuǎn)化成 int 型數(shù)據(jù)。double n2=Double.parseDouble(s7);將 s7 轉(zhuǎn)化成 double 型數(shù)據(jù)。double m=n1+n2;System.out.println(m);String s8=valuOf(m

5、)/String 調(diào)用valuOf(int n)方法將 m轉(zhuǎn)化為字符串對(duì)象 position=s8.indexOf(.);String temp=s8.substring(position+1);System.out.println(數(shù)字+m+有+temp.length()+位小數(shù));String s9=new String(ABCDEF);char a=s8n1,n2/將s8存放到數(shù)組a中。for(int i=a .l ength-1;i=0;i-)System.out.print( +ai);實(shí)訓(xùn)后的練習(xí)：1.程序中的s6改寫成String s6=new String(1a12b ”)；運(yùn)

6、行時(shí)提示怎樣的錯(cuò)誤？2. 請(qǐng)用數(shù)組a的前3個(gè)單元?jiǎng)?chuàng)建一個(gè)字符串并輸出該串。3. 請(qǐng)給出獲取path中jsp ”子字符串的代碼。4. 在程序的適當(dāng)位置增加如下代碼，注意輸出的結(jié)果。String str1= new String(ABCAB”，str2=null, str3=null, str4=nu II;str2=str1.replaceAII(str3=str2.replaceAII(str4=str3.replaceAII(A”, ”First ”)； B”，Second);C”, ”Third ”)；System.out.pri ntln( str1);System.out.pri nt

7、l n( str2);System.out.pri ntln( str3);System.out.pri ntl n( str4);5. 可以使用Long類中的下列static方法得到整數(shù)各種進(jìn)制的字符串表示：Public static String toB in aryStri ng(lo ng i)Public static Stri ng toOctalStri ng(lo ng i)Public static String toHexStri ng(l ong i)Public static String toString(long i,int p) 其中的toString(longi

8、, int p)返回整數(shù)i的p進(jìn)制表示。請(qǐng)?jiān)谶m當(dāng)位置添加代碼輸出12345的二進(jìn)制、八進(jìn)制和十六進(jìn)制表示。6. 在適當(dāng)位置添加代碼，分別輸出數(shù)字m的整數(shù)部分和小數(shù)部分?！窘Y(jié)果】將本次上機(jī)實(shí)訓(xùn)結(jié)果按照實(shí)訓(xùn)要求內(nèi)容依次進(jìn)行，填寫實(shí)訓(xùn)目標(biāo)、過程、結(jié)果。【注意事項(xiàng)】 實(shí)訓(xùn)報(bào)告要求每人提交一份，使用專門的報(bào)告紙，內(nèi)容寫全，包括實(shí)訓(xùn)名稱、班級(jí)、 姓名、同組人，試驗(yàn)日期、交報(bào)告日期等。 報(bào)告不需要填寫源代碼，只要將完成情況和所有練習(xí)題結(jié)果寫上就可以。實(shí)訓(xùn)5 Java異常處理【目的】1) 掌握J(rèn)ava異常的概念及工作機(jī)制2) 掌握異常的分類3) 掌握拋出異常語句的使用(throw)4) 掌握拋出捕獲處理異常語

9、句的使用(trycatchfin ally)5) 掌握上拋異常語句的使用 (throws)6) 掌握創(chuàng)建自定義異常【內(nèi)容】1、編寫一個(gè)應(yīng)用程序，要求從鍵盤輸入一個(gè)double型的圓的半徑，計(jì)算并輸出其面積。測(cè)試當(dāng)輸入的數(shù)據(jù)不是double型數(shù)據(jù)(如字符串“ abc”)會(huì)產(chǎn)生什么結(jié) 果，怎樣處理。(要有測(cè)試結(jié)果圖，看能不能捕獲到異常)package com.JavaTraining.ex?timpart java,ic.iOException;inipor t j ava * i o * I nputSt r e amReade r;import java.io.BufferedReader;p

10、ublic class Circle public static void main(String args) throws IOException system.out.print (請(qǐng)輸A.半徑:);BufferedReader br = new ButferedReader(new Input St reajnReader (System, in);trySystEnu out + pHintin (凰的面*2為 t H+co2zip口(Double-prsercuJbie(br. readLined );catch (Number Format Except ion 皐)System*

11、 out * print In諸重新輸A.) ipublic static double computerArea(double r) return Math.PT4r*r;2、計(jì)算兩個(gè)正數(shù)之和，當(dāng)任意一個(gè)數(shù)超出范圍時(shí)，拋出自己定義的異常(NumberRa ngeException)。(要有測(cè)試結(jié)果圖，看能不能捕獲到異常)package com, JavaTLaimng*ex?;2-ioport java*io,BuffereciReader;-j import java*io;lnt a=Integer.parelnt(br.readLine Q);int b-lnteger.parsern

12、t(br.readLine();SystemQtrtprintln (果t求列為：+conipLiteaf b);catch (NumberRangeExcept ion s)e + printStackTrace ();71箱252627282930313233public static int comput隼(nt a, int b throws NumberRangeException Iif ( (a0 | b0) ? throw new NuirLberRangeEKeeption f； return (a+b);1 package comJvaTraining.ex?;public

13、 class NuinberRangeException extends Exception public NuinberRangeException (String msg) super(msg);石)7 )8Whe n you are old and grey and full of sleep,And no ddi ng by the fire, take dow n this book,And slowly read, and dream of the soft lookYour eyes had once, and of their shadows deep;How many lov

14、ed your mome nts of glad grace,And loved your beauty with love false or true,But one man loved the pilgrim soul in you,And loved the sorrows of your cha nging face;And bending dow n beside the glow ing bars,Murmur, a little sadly, how love fledAnd paced upon the mountains overheadAnd hid his face am

15、id a crowd of stars.The furthest dista nee in the worldIs not betwee n life and deathBut whe n I sta nd in front of youYet you dont know thatI love you.The furthest dista nee in the worldIs not whe n I sta nd in front of youYet you cant see my loveBut whe n un doubtedly knowing the love from bothYet cannot be together.The furthest dista nee in the worldIs not being apart while being in loveBut whe n I pla i