JAVA 程序作业

JA V A程序作业汇编import javax.swing.JOptionPane;public class P3_2{public static void main(String args[]){Stringradius=JOptionPane.showInputDialog("请输入一个半径：");r=Double.parseDouble(radius);doubled,l,s;doubleP=Math.PI;doublefinald=2*r;l=2*P*r;s=P*Math.pow(r,2);JOptionPane.showMessageDialog(null,"圆的直径是："+d+"\n周长是："+l+"\n面积是："+s);("圆的直径是："+d+"\n周长是："+l+"\n面积是："+s);//System.out.println}}import javax.swing.JOptionPane;public class P4_1{public static void main(String args[]){num1,num2;Stringnum1=JOptionPane.showInputDialog("请输入第一个整数：");num2=JOptionPane.showInputDialog("请输入第二个整数：");n1,n2;intn1=Integer.parseInt(num1);n2=Integer.parseInt(num2);max;intmax=n1>n2?n1:n2;result;Stringresult=n1+"和"+n2+"的最大值是:"+max;(result);//System.out.printlnJOptionPane.showMessageDialog(null,result);}}import javax.swing.JOptionPane;public class P4_2{public static void main(String args[]){num1,num2,num3;Stringnum1=JOptionPane.showInputDialog("请输入第一个整数：");num2=JOptionPane.showInputDialog("请输入第二个整数：");num3=JOptionPane.showInputDialog("请输入第二个整数：");n1,n2,n3;intn1=Integer.parseInt(num1);n2=Integer.parseInt(num2);n3=Integer.parseInt(num3);min;intmin=n1<n2?n1:n2;min=min<n3?min:n3;String s=n1+"、"+n2+"和"+n3+"的最小值是:"+min+"\n";s=s+(n1%2==0?n1+"是偶数":n1+"是奇数")+"\n";s=s+(n2%2==0?n2+"是偶数":n2+"是奇数")+"\n";s=s+(n3%2==0?n3+"是偶数":n3+"是奇数")+"\n";s=s+(n3%(n1*n2)==0?n3+"是"+n1+"和"+n2+"的积的倍数":n3+"不是"+n1+"和"+n2+"的积的倍数");JOptionPane.showMessageDialog(null,s);}}import java.io.*;import java.text.DecimalFormat;public class P4_3{public static void main(String args[])throws IOException{br=new BufferedReader(new InputStreamReader(System.in)); BufferedReaderSystem.out.print("请输入圆的半径：");s=br.readLine();Stringr=Double.parseDouble(s);doubled=2*r;doublel=d*Math.PI;doublearea=Math.PI*Math.pow(r,2);doublemyFormat=new DecimalFormat("0.00");DecimalFormatl2=myFormat.format(l);StringStringarea2=myFormat.format(area);("圆的直径是："+d+"\n圆的周长是："+l2System.out.println+"\n圆的面积是："+area2);}}import java.io.*;public class P5_1 {public static void main(String[] args) throws IOException {br=new BufferedReader(new InputStreamReader(System.in)); BufferedReaderSystem.out.print("请输入一个年份：");s1=br.readLine();StringSystem.out.print("请输入一个月份：");Strings2=br.readLine();year=Integer.parseInt(s1);intmonth=Integer.parseInt(s2);intdays=0;intswitch(month){1:casecase3:5:case7:case8:case10:case12:casedays=31;break;4:case6:case9:case11:casedays=30;break;2:caseif(year%4==0&&year%100!=0||year%400==0)days=29;elsedays=28;break;default:System.out.println(month+"不是正确的月份！");//break;}System.out.println(year+"年"+month+"月有"+days+"天");}}import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;public class P5_2 {public static void main(String[] args) throws IOException {BufferedReaderbuffer=InputStreamReader(System.in));BufferedReader(newnewSystem.out.print("请输入一个5位的整数：");s=buffer.readLine();Stringn=Integer.parseInt(s);intif(n<10000||n>99999)System.out.println("对不起！你输入的不是5位数！");else{n1,n2,n3,n4,n5;intn1=n/10000;//万//n2=n/1000-10*n1;//n2=(n-n1*10000)/1000;n2=n%10000/1000;//千n3=n%1000/100;//百n4=n%100/10;//十n5=n%10;//个if(n5==n1&&n2==n4)System.out.println(n+"是回文数！");elseSystem.out.println(n+"不是回文数！");}}}import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;public class P6_1 {public static void main(String[] args) throws IOException {BufferedReader(new InputStreamReader(System.in));buffer=newBufferedReaderSystem.out.print("请输入数字a（1~9）:");s1=buffer.readLine();Stringa=Integer.parseInt(s1);intSystem.out.print("请输入数字n:");s2=buffer.readLine();Stringn=Integer.parseInt(s2);intp=0,sum=0,i=1;intwhile(i<=n){p=p*10+a;sum+=p;i++;}j=1;j<=n;j++)for(int{k=1;k<=j;k++)for(int{System.out.print(a);}if(j<n)System.out.print("+");elseSystem.out.print("=");}System.out.println(sum);}}public class P6_2 {public static void main(String[] args) {i=1;i<=5;i++)for(int{for(intj=1;j<=5-i;j++)");System.out.print("k=1;k<=i;k++)for(intSystem.out.print(k);m=i-1;m>=1;m--)for(intSystem.out.print(m);System.out.println();}}}public class P6_3 {public static void main(String[] args) {i=0;i<=9;i++)//尝试男人个数for(int{j=0;j<=12;j++)//尝试女人个数for(int{k=0;k<=36;k+=2)//尝试小孩个数 for(int{if(i+j+k==36&&4*i+3*j+k/2==36){System.out.println("男的："+i+"人");System.out.println("女的："+j+"人");System.out.println("小孩："+k+"人");}}}}}}public class P6_4 {public static void main(String[] args) {i=1;i<=9;i++)for(intSystem.out.print(i+" ");System.out.println();System.out.println("-----------------------");i=1;i<=9;i++)for(int{j=1;j<=9;j++)for(int{//if(j<=i)//只输出下三角{if(i*j<10)System.out.print(i*j+" ");elseSystem.out.print(i*j+" ");}}System.out.println();}}}import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;public class P6_5 {public static void main(String[] args) throws IOException {BufferedReader(new InputStreamReader(System.in)); BufferedReaderbuffer=newi=1;int31);max=-(int)Math.pow(2,//intmin=(int)Math.pow(2,31)-1;//intmax=Integer.MIN_V ALUE;intmin=Integer.MAX_V ALUE;intwhile(i<=5){System.out.print("请输入第"+i+"个整数:");s=buffer.readLine();Stringn=Integer.parseInt(s);intif(n>max)max=n;if(n<min)min=n;i++;}System.out.println("max="+max+"\nmin="+min);}}public class P7_1 {public static void main(String[] args) throws IOException {BufferedReader(new InputStreamReader(System.in)); BufferedReaderbuffer=newint n;do{System.out.print("请输入一个自然数(输入0停止)：");s=buffer.readLine();Stringn=Integer.parseInt(s);if(n==0)break;do{if(n%2==1){n=n*3+1;System.out.print(n+" ");}else{n=n/2;System.out.print(n+" ");}}while(n!=1);System.out.println();}while(n!=0);}}public class P7_2 {public static int factor(int m,int n){int r=m%n;while(r!=0){m=n;n=r;r=m%n;}n;return}public static void main(String[] args) {24);n=factor(16,intSystem.out.println(n);}}import java.io.*;public class P7_3 {public static void shuChu(int n){i=1;i<=n;i++)for(int{j=1;j<=n-i;j++)for(int{");System.out.print("}j=1;j<=2*i-1;j++)for(int{System.out.print((char)(64+i));}System.out.println();}}public static void main(String[] args) throws IOException {BufferedReader(new InputStreamReader(System.in)); BufferedReaderbuffer=newint n;do{System.out.print("请输入图形的行数(0停止)：");s=buffer.readLine();Stringn=Integer.parseInt(s);shuChu(n);}while(n!=0);}}import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;public class P8_1 {public static String reverse1(String s){s1="";Stringfor(inti=s.length()-1;i>=0;i--){s1=s1+s.charAt(i);}s1;return}public static void reverse2(String s){for(inti=s.length()-1;i>=0;i--){System.out.print(s.charAt(i));}System.out.println();}public static void main(String[] args) throws IOException {br=new BufferedReader(new InputStreamReader(System.in)); BufferedReaderString s;do{System.out.print("请输入一个字符串：");s=br.readLine();//System.out.println(reverse1(s));/*if(s.equals("0"))break;reverse2(s);*/if(!s.equals("0"))reverse2(s);}while(s.equals("0")==false);}}import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;public class P8_2 {public int round(double n){if(n>=0){inta=(int)n;b=n-a;doubleif(b>=0.5)return a+1;elsereturn a;}else{a=(int)n;intb=-(n-a);doubleif(b>=0.5)return a-1;elsereturn a;}}public static void main(String[] args) throws IOException {br=new BufferedReader(new InputStreamReader(System.in)); BufferedReaderString s;do{System.out.print("请输入一个小数(输入quit退出)：");s=br.readLine();if(s.equals("quit"))break;d=Double.parseDouble(s);doubleP8_2();p=newP8_2System.out.println(p.round(d));}while(s.equals("quit")==false);}}public class P9_1 {public static int gcd(int x,int y){if(y==0)x;returnelsegcd(y,x%y);return}public static void main(String[] args) {System.out.println(gcd(16,24));}}public class P9_2 {public static int getPower(int x,int y){if(y==0)1;returnelsex*getPower(x,y-1);return}public static void main(String args[]) {10));System.out.println(getPower(2,}}import java.text.DecimalFormat;public class P9_3 {public static void main(String[] args) {score[];//int//score=newint[]{72,89,65,58,87,91,53,82,71,93,76,68};score[]={72,89,65,58,87,91,53,82,71,93,76,68};intint sum=0;for (int i = 0; i < score.length; i++) {sum+=score[i];}ave=(double)sum/score.length;doubleDecimalFormat("0.0");f=newDecimalFormatSystem.out.println("平均成绩是："+f.format(ave));}}public class CountSort {public static void countSort(int n[])//对数组n进行计数排序的方法{intint[n.length];//定义排序后的数组mm[]=newcount[]=newint[n.length];//记录数组n中某个数据在数组m中的位置，初始值为 inti=0;i<n.length;i++)for(int{j=i+1;j<n.length;j++)for(int{if(n[i]>n[j])count[i]++;elsecount[j]++;}//m[count[i]]=n[i];}i=0;i<m.length;i++)for(int{m[count[i]]=n[i];}i=0;i<m.length;i++)//输出排序后的数组for(int{");System.out.print(m[i]+"}System.out.println();}public static void main(String[] args) {inta[]={7,4,0,6,2,5,1,5};CountSort.countSort(a);}}public class P10_1 {public static int[] tongJi(int n[]){int[5];count[]=newinti=0;i<n.length;i++)for(int{if(n[i]<60)count[0]++;else{count[n[i]/10-5]++;}}count;return}public static void main(String[] args) {score[]={72,89,65,58,87,91,53,82,71,93,76,68}; intcount[]=P10_1.tongJi(score);intSystem.out.println("等级\t人数");i=count.length-1;i>=0;i--)for(int{System.out.println((char)(69-i)+"\t"+count[i]);}}}import java.io.*;public class P10_2 {public static void output(int n[]){odd[],even[];intoddNum=0,evenNum=0;intfor (int i = 0; i < n.length; i++){if(n[i]%2==0)evenNum++;elseoddNum++;}odd=newint[oddNum];int[evenNum];even=newk=0,j=0;intfor (int i = 0; i < n.length; i++){if(n[i]%2==0){even[k]=n[i];k++;}else{odd[j]=n[i];j++;}}if(oddNum<evenNum){for (int i = 0; i <oddNum; i++){");System.out.print(odd[i]+"");System.out.print(even[i]+"}i=oddNum;i<evenNum;i++)for(int{");System.out.print(even[i]+"}}else{for (int i = 0; i <evenNum; i++){");System.out.print(odd[i]+"");System.out.print(even[i]+"}i=evenNum;i<oddNum;i++)for(int{");System.out.print(odd[i]+"}}System.out.println();}public static void main(String[] args) throws IOException {BufferedReaderbr=new BufferedReader(new InputStreamReader(System.in));int[10];n[]=newintfor (int i = 0; i < n.length; i++) {System.out.print("请输入第"+(i+1)+"个整数：");Strings=br.readLine();num=Integer.parseInt(s);intn[i]=num;}P10_2.output(n);}}。