java基础与面向对象实用小程序

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1、例3-1对象中成员变量的灵活定义及使用本例模拟通讯录功能，定义了Person类保存人员信息，能够对用户输入的姓名、性别、电话号码进行保存，还可进行分类。Person类的多个对象就是通讯录中的一套套完整信息。importjava.util.Scanner;classPerson{Stringname;charsex;StringphoneNumber;Stringcategory[]={"同学","同事","朋友","家人"};inti;voidsetInfo(){intn;Scannerreader=newS

2、canner(System.in);System.out.print("姓名：");name=reader.next();System.out.print("性别：");sex=reader.next().charAt(0);System.out.print("电话号码：");phoneNumber=reader.next();do{System.out.print("选择分类：1.同学2同事3朋友4家人请选择：");i=reader.nextInt()-1;}while(i<0

3、

4、i>3);}voidsho

5、wInfo(){System.out.println(name+"t"+sex+"t"+phoneNumber+"t"+category[i]);}}publicclassPersonTest{publicstaticvoidmain(String[]args){Personp[]=newPerson[3];for(inti=0;i<3;i++){p[i]=newPerson();System.out.println("------请输入第"+(i+1)+"个人的信息------");p[i].setI

6、nfo();otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,heha

7、sbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand}System.out.println("------------------------------------");System

8、.out.println("姓名t性别t电话号码t分类");for(inti=0;i<3;i++)p[i].showInfo();}}例3-2熟悉Java的基本数据类型publicclassBasicDataTypes{publicstaticvoidmain(Stringargs[]){byteb=0x55;//将十六进制数据赋值给bshorts=0x55ff;//将十六进制数据赋值给sinti=1000000;longl=0x10EF;//将十六进制数据赋值给lcharc='*';floatf=0.

9、23f;doubled=0.7E-3;//将科学计数法表示的浮点型数据赋值给dbooleanbool=true;System.out.println("byteb="+b);System.out.println("shorts="+s);System.out.println("inti="+i);System.out.println("longl="+l);System.out.println("charc="+c);System.out.println("floatf="+f);System.out.pri

10、ntln("doubled="+d);System.out.println("booleanbool="+bool);}}例3-3熟悉Java中的各类型的转换publicclassConversion{publicstaticvoidmain(Stringargs[]){byteb;inti=257;doubled=323.567;charch;shorts;b=(byte)i;//将整型变量i的数