Java 基础题目集锦.doc

Java 基础题目集锦【本人自己对照树上的问题进行的解答，】【1】import java.util.Scanner;public class Add public static void main(String args) final int NUM=10;System.out.println( n*);System.out.println( t欢迎使用加法测试小游戏);System.out.println();System.out.println( =);System.out.println(nLets Begin:);System.out.println();System.out.println(请选择加法范围：0-10以内t1-100以内t2-1000以内);Scanner scan=new Scanner(System.in);int flag;flag=scan.nextInt();int GO=10;while(flag3)System.out.print(请重新选择加法范围：);flag=scan.nextInt();switch(flag)case 0:GO=10;break;case 1:GO=100;break;default:GO=1000;int count1=0,count2=0;int c;while(count1+count2NUM)int n=(int)(Math.random()*GO+1);int m=(int)(Math.random()*GO+1);System.out.printf(%d + %d+ = ,n,m);c=scan.nextInt();if(c=(m+n)System.out.println(Well Done!);count1+;elseSystem.out.println(You Need More Practice);count2+;System.out.println(nYour Grades Are:+(count1*10-count2*10);switch(count1)case 10:System.out.println(You Are So Clever);break;case 9:System.out.println(You Are Exclent);break;case 8:System.out.println(You Are Hardworking);break;case 7:System.out.println(You Are Good);break;case 6:System.out.println(You Need Word Hard);break;default:System.out.println(You should Study Hard);System.out.println(Tranks For Using.);8888888888888888888888888888888888888888888888888888888888888888888888888888888【2】import java.util.Scanner;/import java.swing.JFrame;import java.util.Random;public class averagepublic static void main(String args) int a,b,c;/*Scanner scan=new Scanner(System.in);System.out.print(Enter a:);a=scan.nextInt();System.out.print(Enter b:);b=scan.nextInt();System.out.print(Enter c:);c=scan.nextInt();double ave=(a+b+c)/3.0;System.out.println(ave=+ave);System.out.println(Hello World!nn);String phrase=Change is inevitable;String m1,m2,m3,m4,m5;boolean t1,t2;char c1;int s;System.out.println(Original string:+phrase);System.out.println(Length of string:+phrase.length();m1=phrase.concat(, excepte for veding mechine.);m2=m1.toUpperCase();m3=m2.replace(E,e);m5=m3.toLowerCase();m4=m3.substring(3,30);t1=m3.equals(m3);t2=m3.equalsIgnoreCase(m2);c1=m2.charAt(1);s=pareTo(m1);System.out.println(M #1:+m1);System.out.println(M #2:+m2);System.out.println(M #3:+m3);System.out.println(M #4:+m4);System.out.println(t1=+t1);System.out.println(t2=+t2);System.out.println(c1=+c1);System.out.println(s=+s);System.out.println(M Length:+m4.length();Random generator=new Random();int num1;float num2;num1=generator.nextInt();System.out.println(A Random integer:+num1);num1=generator.nextInt(10);System.out.println(From 0-9:+num1);num1=generator.nextInt(15)+10;System.out.println(From 15-24:+num1);num2=generator.nextFloat();System.out.println(Between 0-1:+num2);num2=generator.nextFloat();num1=(int)num2*6;System.out.println(From 0-5:+num1);*/a=2;System.out.println(Math.abs(a)=+Math.abs(a);double b1=3.111,c0=10;System.out.printf(a=%4d,a);System.out.printf(b1=%4ld,b1);System.out.printf(c0=%4ld,c0);System.out.println(Math.acos(b1)=+Math.acos(b1);System.out.println(Math.asin(b1)=+Math.asin(b1);System.out.println(Math.atan(b1)=+Math.atan(b1);System.out.println(Math.sin(b1)=+Math.sin(b1);System.out.println(Math.cos(b1)=+Math.cos(b1);System.out.println(Math.tan(b1)=+Math.tan(b1);System.out.println(Math.ceil(b1)=+Math.ceil(b1);System.out.println(Math.exp(b1)=+Math.exp(b1);System.out.println(Math.floor(b1)=+Math.floor(b1);System.out.println(Math.sqrt(b1)=+Math.sqrt(b1);System.out.println(Math.pow(b1,c0)=+Math.pow(b1,c0);System.out.println(Math.random()=+Math.random();System.out.println(Math.max(b1,c0)=+Math.max(b1,c0);System.out.println(Math.min(b1,c0)=+Math.min(b1,c0);System.out.println(Endimg here.);&【3】public class ChangeMoneypublic static void main(String args) System.out.println(nHello World!);change(20.52);change(20);public static void change(double n)int num1=(int)n/2;int num2=(int)n-num1*2;int num3=(int )(n-(int)n)*10/5);int num4=(int)(n-(int)n)*10-5*num3);int num5=(int)(n*100)%10/5;int num6=(int)(n*100)%10-num5*5)/2;int num7=(int)(n*100)%10-num5*5-num6*2;System.out.print(n+RMB=+num1+ 个2元+ );System.out.print(num2+ 个1元+ );System.out.print(num3+个5角+ );System.out.print(num4+个1角+ );System.out.print(num5+个5分+ );System.out.print(num6+个2分+ );System.out.println(num7+个1分n);&【4】/定义一个圆类/import java.util.Scanner;public class Circlefinal double PI=3.14;private double radius;private double area;private double circumference;public Circle(double radius)this.radius=radius;area=radius*radius*PI;circumference=2*PI*radius;public Circle(Circle c)this.radius=c.radius;this.area=c.area;this.circumference=c.circumference;public String toString()return Radius:+radius+nCircumference Of Circle:+circumference+nArea Of Circle:+area;public static void main(String args) Scanner scan=new Scanner(System.in);System.out.print(Input the Radius: );double radius=scan.nextDouble();Circle c1=new Circle(radius);Circle c2=new Circle(c1);System.out.println(c1.toString();System.out.println(c2.toString();&【5】 class Circlestatic double PI=3.1415926;int r;public Circle(int r)this.r=r;public class CircleTestpublic static void main(String args) System.out.println(nHello World!);Circle c=new Circle(100);System.out.println(c.PI);System.out.println(Circle.PI);System.out.println(c.r);/System.out.println(Circle.r);Circle.PI=3.14;/类变量在类中只有一个值/可以使用两种不同的方式来访问类的成员：类名和对象名/但对于非静态的数据成员，则静态方法中的使用类名来访问是无法对其进行访问的System.out.println(c.PI);System.out.println(Circle.PI);System.out.println();&【6】public class Coinprivate final int HEAD=0;private int face;public Coin()flip();public void flip()face=(int)(Math.random()*2);public boolean isHead()return(face=HEAD);public String toString()return (face=HEAD)?Heads:Tails;&【7】public class CompareStringspublic static void main(String args) System.out.println(nn);String str=new String16;str0=fred;str1=Ethel;str2=?-?-?-?;str3=();str4=Lucky;str5=ricky;str6=book;str7=*;str8=12345;str9= ;str10=HEPHALUMP;str11=bookeeper;str12=6789;str13=:+7;str14=;str15=hephalump;for(String s:str)System.out.println(s);System.out.println(Here Is Endding.);int c;for(int i=0;istr.length-1;i+)for(int j=0;j0)String t=strj;strj=strj+1;strj+1=t;for(String s:str)System.out.print(s+t);&【8】public class Continuepublic static void main(String args) outer:for(int i=0;i10;i+)inner:for(int j=0;j10;j+)if(ij)System.out.println();continue outer;System.out.print( +i+*+j +=+j*i);&【9】public class CountFlipspublic static void main(String args)final int Flips=1000;int heads=0,tails=0;Coin mycoin=new Coin();for(int count=1;count=Flips;count+)mycoin.flip();if(mycoin.isHead()heads+;elsetails+;System.out.println(Number of Flips:+Flips);System.out.println(Number of Heads:+heads);System.out.println(Number of Tails:+tails);&【10】import java.util.Scanner;public class Echopublic static void main(String args) System.out.println(Enter a new waord!);String message;Scanner scanner=new Scanner(System.in);message=scanner.nextLine();System.out.println(You enter :+message);int a=scanner.nextInt();float b=scanner.nextFloat();double c=scanner.nextDouble();boolean d=scanner.nextBoolean();boolean e=scanner.hasNext();System.out.println(Now you enter 1:+a);System.out.println(Now you enter 2:+b);System.out.println(Now you enter 3:+c);System.out.println(Now you enter 4:+d);System.out.println(Now you enter 5:+e);&【11】import java.util.Scanner;public class Factorialpublic static void main(String args) System.out.println();Scanner scan=new Scanner(System.in);System.out.print(Input n: );int n=scan.nextInt();int m1=Factorial2(n);System.out.printf(%d!=%4dn,n,m1);int m2=Factorial2(n);System.out.printf(%d!=%4dn,n,m2);public static int Factorial1(int n)int f=0;if(n=0|n=1)f=1;elsef=n*Factorial1(n-1);return f;public static int Factorial2(int n)int f=1;for(int i=2;i=n;i+)f= f*i;return f;&【12】import java.util.Scanner;import java.io.*;public class FileReadpublic static void main(String args) throws IOExceptionSystem.out.println(nHello World!n);String url;Scanner filescan,urlscan;filescan=new Scanner (new File(url.txt);while(filescan.hasNext()url=filescan.nextLine();System.out.println(URL: +url);urlscan=new Scanner(url);urlscan.useDelimiter(/);/urlscan.useDelimiter(.);while(urlscan.hasNext()System.out.println( +urlscan.next();System.out.println();&【13】public class FlipRacepublic static void main(String args) final int GO=3;int count1=0,count2=0;Coin coin1=new Coin();Coin coin2=new Coin();while(count1GO&count2GO)coin1.flip();coin2.flip();System.out.println(Coin1:+coin1+tCOin2:+coin2);count1=(coin1.isHead()?count1+1:0;count2=(coin2.isHead()?count2+1:0;System.out.println();if(count1GO)System.out.println(Coin2 Wins!);else if(count2GO)System.out.println(Coin1 Wins!);else System.out.println(Its a Tile!);&【14】public class function public static void main(String args) int iResult,num1=25,num2=40,num3=17,num4=5;double fResult,val1=17.0,val2=12.78;iResult=num1/num4;fResult=num1/num4;System.out.println(iResult=num1/num4=+iResult);System.out.println(fResult=num1/num4=+fResult);iResult=num3/num4;fResult=num3/num4;System.out.println(iResult=num3/num4=+iResult);System.out.println(fResult=num3/num4=+fResult);fResult=val1/num4;System.out.println(fResult=val1/num4=+fResult);fResult=val1/val2;System.out.println(fResult=val1/val2=+fResult);iResult=num1/num2;fResult=(double)num1/num2;System.out.println(iResult=num1/num2=+iResult);System.out.println(fResult=(double)num1/num2=+fResult);iResult=(int)(val1/num4);fResult=(int)(val1/num4);System.out.println(iResult=(int)(val1/num4)=+iResult);System.out.println(fResult=(int)(val1/num4)=+fResult);fResult=(int)(double)num1/num2);iResult=num3%num4;System.out.println(fResult=(int)(double)num1/num2)=+fResult);System.out.println(iResult=num3%num4=+iResult);iResult=num2%num3;System.out.println(iResult=num2%num3=+iResult);iResult=num3%num2;System.out.println(iResult=num3%num2=+iResult);iResult=num2%num4;System.out.println(iResult=num2%num4=+iResult);iResult=num2%num2;System.out.println(iResult=num2%num2=+iResult);System.out.println(nThere is the Ending);&【15】import java.text.NumberFormat;import java.util.Scanner;public class Guess1 public static void main(String args) final int GO=227;System.out.println(欢迎进入猜谜小游戏！!);NumberFormat fo=NumberFormat.getPercentInstance();int count1=0,count2=0;doint m=(int)(Math.random()*100+1); int n=(int)(Math.random()*100+1);if(n=m)System.out.println(YEAH,COME ON!);count1+;elseSystem.out.println(MOREEXERCISR!);count2+;while(count1+count2)n)System.out.println(Input Smaller!);count2+;else if(mn)System.out.println(Input Bigger!);count2+;elseSystem.out.println(YEAH,COME ON!);count1+;System.out.print(请输入您的数字【0-100】:);while(scan.hasNextInt();System.out.println(You Hava Guess : +(count1+count2)+ Times);System.out.println(You Win :+count1+ Times);System.out.println(Rate of Win :+fo.format(count1*1.0)/(count1+count2);if(count1*1.0)/(count1+count2) +s2);num+;&【18】/接口实现的例子/interface Shape2Dfinal double PI=3.14;public abstract double area(); class Circle implements Shape2Ddouble radius;public Circle(double radius)this.radius=radius;public double area()return PI*radius*radius;class Rectangle1 implements Shape2Dprivate int wid,len;public Rectangle1(int wid,int len)this.wid=wid;this.len=len;public double area()ret