POJ题目Java代码（一）

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POJ 1001 Exponentiation

import java.math.BigDecimal;import java.util.Scanner;public class Poj1001 {public static void main(String[] args) {Scanner sc = new Scanner(System.in);while(sc.hasNext()){BigDecimal bigDecimal = new BigDecimal(sc.next());int powValue = sc.nextInt();BigDecimal result = bigDecimal.pow(powValue);//stripTrailingZeros()：如果小数点后面都是0的话，则把小数点和后面的0都去掉；//toPlainString()是什么样子的小数就显示什么样子，toString()将小数用科学计数法表示。String str = result.stripTrailingZeros().toPlainString();//如果是小数，并且个位是0，则将0去掉if(str.startsWith("0")){str = str.substring(1);}System.out.println(str);}}}

POJ 1002 487-3279

import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.Scanner;public class Poj1002 {static char[] map = "22233344455566677778889999".toCharArray();static char[] str = new char[80];static char[][] telNumbers = new char[100000][8];public static void main(String[] args) {Scanner sc = new Scanner(System.in);int n = sc.nextInt();for (int i = 0; i < n; i++) {String s = sc.next();str = s.toCharArray();initTel(i);}ArrayList<String> list = new ArrayList<String>();//将二维char数组转换为ArrayList<String>for(int i=0; i<n; i++){list.add(String.valueOf(telNumbers[i]));}//对数据进行排序Collections.sort(list, new MyComparator());//搜索重复的电话号码，并进行输出boolean noDuplicate = true;int i = 0, j;while(i<n){j = i;i++;while(i<n && list.get(i).equals(list.get(j))){i++;}if(i-j > 1){System.out.println(list.get(j) + " " + (i-j));noDuplicate = false;}}if(noDuplicate){System.out.println("No duplicates.");}}/** * 将第n行的电话号码转换成标准形式（全数字形式带连接符） */static void initTel(int n) {int j = -1, k = -1;while (k < 8) {j++;//如果是连接符‘-’，跳过try {if (str[j] == '-') {continue;}} catch (ArrayIndexOutOfBoundsException e) {break;}k++;//在第三到第四个位置之间插入一个连接符‘-’if (k == 3) {telNumbers[n][k] = '-';k++;}//如果是字母，则将其转换为数字if (str[j] >= 'A' && str[j] <= 'Z') {telNumbers[n][k] = map[str[j]-'A'];continue;}//如果是数字，直接存起来telNumbers[n][k] = str[j];}}/** * 设置比较规则 */private static class MyComparator implements Comparator<String>{@Overridepublic int compare(String o1, String o2) {return o1.compareTo(o2);}}}

POJ 1003 HangOver

import java.util.Scanner;public class Poj1003 {public static void main(String[] args) {Scanner sc = new Scanner(System.in);float f;while(sc.hasNext()){f = sc.nextFloat();if(f==0){break;}System.out.println(getNumber(f) + " card(s)");}}//利用循环找出需要多少块卡片才能伸出value的长度private static int getNumber(float value){float temp = 0F;int n = 2;while(temp < value){temp += 1.0/n;n++;}return n-2;}}

POJ 1004 Financial Management

import java.text.DecimalFormat;import java.util.Scanner;public class Poj1004 {public static void main(String[] args) {Scanner sc = new Scanner(System.in);double sum = 0.0;for(int i=0; i<12; i++){double d = sc.nextDouble();sum += d;}double result = sum/12.0;//对结果小数进行格式化DecimalFormat df = new DecimalFormat(".00");String str = df.format(result);System.out.println("$" + str);}}

POJ 1005 I Think I Need a Houseboat

import java.util.Scanner;public class Poj1005 {public static void main(String[] args) {Scanner sc = new Scanner(System.in);int n = sc.nextInt();for (int i = 0; i < n; i++) {double x = sc.nextDouble();double y = sc.nextDouble();System.out.println("Property " + (i + 1)+ ": This property will begin eroding in year "+ getYear(x, y) + ".");}System.out.println("END OF OUTPUT.");}static int getYear(double x, double y) {int year = 0;double area = 0.0;while (area < (Math.PI * (x * x + y * y)) / 2) {year++;area = year * 50.0;}return year;}}

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