Java语言程序设计基础篇

本文格式为Word版，下载可任意编辑——Java语言程序设计基础篇Java语言程序设计根基篇

导语：Java是一门面向对象编程语言，不仅吸收了C++语言的各种优点，还摒弃了C++里难以理解的多继承、指针等概念，因此Java语言具有功能强大和简朴易用两个特征。下面我们来看看Java语言程序设计根基篇，梦想对大家有所扶助。

1.1显示三条消息

packagedemo11;

publicclassdemo01

publicstaticvoidmainString[]args

System.out.printlnWelcometoJava;

System.out.printlnWelcometoComputerScience;

System.out.printlnProgrammingisfun;

.1.2显示五条信息

packagedemo11;

publicclassdemo02

publicstaticvoidmainString[]args

System.out.printlnWelcometoJava;

System.out.printlnWelcometoJava;

System.out.printlnWelcometoJava;

System.out.printlnWelcometoJava;

System.out.printlnWelcometoJava;

1.3显示图案

packagedemo11;

publicclassdemo03

publicstaticvoidmainString[]args

System.out.printlnJAVVA;

System.out.printlnJAAVVAA;

System.out.printlnJJAAAAAVVAAAAA;

System.out.printlnJJAAVAA;

1.4打印表格

packagedemo11;

publicclassdemo04

publicstaticvoidmainString[]args

System.out.printlnaa^2a^3;

System.out.println111;

System.out.println248;

System.out.println3927;

System.out.println41664;

1.5计算表达式

packagedemo11;

publicclassdemo05

publicstaticvoidmainString[]args

doublea=9.5*4.5-2.5*3/45.5-3.5;

System.out.printlna;

1.6数列求和

packagedemo11;

publicclassdemo06

publicstaticvoidmainString[]args

intsum=0;

forinti=1;i=9;i++

sum+=i;

System.out.printlnsum;

1.7近似求P

packagedemo11;

publicclassdemo07

publicstaticvoidmainString[]args

doublea=4*1-1.0/3+1.0/5-1.0/7+1.0/9-1.0/11;

doubleb=4*1-1.0/3+1.0/5-1.0/7+1.0/9-1.0/11+1.0/13;

System.out.printlna;

System.out.printlnb;

1.8圆的面积和周长

packagedemo11;

publicclassdemo08

publicstaticvoidmainString[]args

doubleradius=5.5;

doubleperimeter=2*radius*Math.PI;

doublearea=radius*radius*Math.PI;

System.out.println该圆的周长为:+perimeter+,面积为:+area;

1.9矩形的'面积和周长

packagedemo11;

publicclassdemo09

publicstaticvoidmainString[]args

doublewidth=4.5;

doubleheight=7.9;

doublearea=width*height;

System.out.printlnarea;

1.10以英里计的平均速度

packagedemo11;

publicclassdemo10

publicstaticvoidmainString[]args

inttime=45*60+30;

doubledistance=14;

System.out.println每英里速度为:+distance/time*60/1.6+;

1.11人口估算

packagedemo11;

publicclassdemo11

publicstaticvoidmainString[]args

intmCurrentPeoPle=312032486;

finalintALL_OF_TIME=5*365*24*60*60;

//出世人口

intmBirthPeople=ALL_OF_TIME/7;

//死亡人口

intmDeathPeople=ALL_OF_TIME/13;

//移民人口

intmMigrate=ALL_OF_TIME/45;

intmAllPeople=mCurrentPeoPle+mBirthPeople+mMigrate-mDeathPeople;

System.out.printlnmAllPeople+,五年共生长了+mAllPeople-mCurrentPeoPle+,人口;

1.12以公里计的平均速度

packagedemo11;

publicclassdemo12

publicstaticvoidmainString[]args

inttime=100*60+35;

doubledistance=24;

System.out.println每公里速度为:+distance/time*60*1.6;

1.13代数：求解2X2线性方程

packagedemo11;

publicclassdemo13

publicstaticvoidmainString[]args

doublea=3.4;

doubleb=50.2;

doublec=2.1;

doubled=0.55;

doublee=44.5;