云大JAVA实验4Lab4陆歌浩

1、云南大学软件学院 实验报告课程： java程序设计实验 学期： 2012-2013学年 第一学期 任课教师： 陆歌浩 专业： 软件工程 学号： 序号： 姓名： 成绩： 实验4 fundamental programming structures in java: strings一、实验目的练习java基本编程结构，包括字符串，输入输出等。二、实验内容1. program 1write a program called string1.java and do the following: create a string object that accepts input from the use

2、r. referencing the jdk docs, execute 2 different methods on the string. print the results of the methods.result:length of string is 11first 5 bytes of string are how aimport javax.swing.joptionpane;public class string1public static void main(string arg)string inputvalue = joptionpane.showinputdialog

3、("请输入一个字符串："); /接受用户输入的（字符串）stringbuffer temp=new stringbuffer();temp.append(inputvalue);joptionpane.showmessagedialog(null, "length of string is: " + temp.length()+".", "执行结果", joptionpane.plain_message); joptionpane.showmessagedialog(null, "first 5 byte

4、s of string are: " + temp.substring(0,5)+".", "执行结果", joptionpane.plain_message); 运行截图： 图1.1（输入文本框） 图1.1（显示字符串长度）图1.3（显示字符串的前5个字符）2. program 2write a program called stringbuffer1.java that does the following: create a stringbuffer object. referencing the jdk docs, execute 2

5、different methods on the stringbuffer. print the results of the methods.for example, using reverse() and replace() methods:output:input string reversed is: tset a si sihtreplacing characters 3 thru 5 with * looks like: ts* si sihtimport javax.swing.joptionpane;public class stringbuffer1public static

6、 void main(string arg)string inputvalue = joptionpane.showinputdialog("请输入一个字符串："); /接受用户输入的（字符串）stringbuffer temp=new stringbuffer();temp.append(inputvalue);string str="*"joptionpane.showmessagedialog(null, "input string reversed is: " + temp.reverse(), "执行结果"

7、;, joptionpane.plain_message); joptionpane.showmessagedialog(null, "replacing characters 3 thru 5 with * looks like: " + temp.replace(2, 5, str)+".", "执行结果", joptionpane.plain_message); 运行截图： 图2.1（输入） 图2.2（字符串倒置）图2.3（替换后结果）3. program 3write a program called stringtokeni

8、zer1.java that accepts a string, looks for commas within the string, and breaks the string up into the parts separated by the comma. for example, the string "kunming, yunnan, china" would return three strings: string1 = "kunming" string2 = "yunnan" string3 = "china

9、" display the input string and the resulting strings.kunmingyunnanchinaimport javax.swing.joptionpane;public class stringtokenizer1public static void main(string arg)string inputvalue = joptionpane.showinputdialog("input a list separated by commas."); /接受用户输入的（字符串）string a=inputvalue.

10、split(",");/调用split方法for(string temp:a) system.out.print(temp); system.out.println(); 运行截图：图3.1（输入）图3.2（切割后结果）4. program 4design and write a java class named salesarray.java that will: 1. declare a two-dimensional integer array named sales.  populate the first four columns using the f

11、ollowing data.quarter 1quarter 2quarter3quarter 4totaldept. 1750660910800dept. 2800700950900dept. 3700600750600dept. 48508001000950dept. 5900800960980total2. write a loop to compute and populate the total column.  within the loop, dispaly each department total as it is computed.3. write a loop

12、to compute and populate the total row.  within the loop, display each quarter's total as it is computed.public class salesarray public static void main(string args) int a= 750,660, 910, 800, 800,700, 950, 900, 700,600, 750, 600, 850,800, 1000,950, 900,800, 960, 980 ;/建立一个已知值的数组； string s=&q

13、uot; ","quarter1 ","quarter2 ","quarter3 ","quarter4","total " for (int j = 0; j <s.length; j+) system.out.printf("%9s",sj); system.out.println( );/用于显示首行int total=0;int total2=0;int total3=0;for(int i=0;i<a.length;i+)system.out.

14、print("dept."+(i+1)+":");for(int j=0;j<ai.length;j+)system.out.printf("%9d", aij);total+=aij;total3+=aij;/用于存放数组元素的总和system.out.println(" "+total);total=0;/打印出每一行的总和后将总和置为零，用于统计下一行的总和。 /total用于统计数组元素的总和，故不需要置零。/打印出数组并计算显示行的total值；system.out.print("total :");for(int i=0;i<a0.length;i+)for(int j=0;j<a.length;j+)total2+=aji;system.out.printf("%9d", total2);total2=0; /打印出每一列