java面试笔试题大汇总之编程篇

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1 ．现在输入 n 个数字，以逗号，分开；然后可选择升或者降序排序；按提交键就在另一页面显示按什么排序，结果为，提供 reset

import java.util.*;

public class bycomma{

  public static String[] splitStringByComma(String source){

   if(source==null||source.trim().equals(""))

    return null;

   StringTokenizer commaToker = new StringTokenizer(source,",");

   String[] result = new String[commaToker.countTokens()];

   int i=0;

   while(commaToker.hasMoreTokens()){

    result[i] = commaToker.nextToken();

    i++;

   }

   return result;

  }

  public static void main(String args[]){

  String[] s = splitStringByComma("5,8,7,4,3,9,1");

  int[] ii = new int[s.length];

  for(int i = 0;i<s.length;i++){

  ii[i] =Integer.parseInt(s[i]);

  }

    Arrays.sort(ii);

    //asc

    for(int i=0;i<s.length;i++){

    System.out.println(ii[i]);

    }

    //desc

    for(int i=(s.length-1);i>=0;i--){

    System.out.println(ii[i]);

    }

  }

}

2 ．金额转换，阿拉伯数字的金额转换成中国传统的形式如：（￥ 1011 ）－ > （一千零一拾一元整）输出。

package test.format;

import java.text.NumberFormat;

import java.util.HashMap;

public class SimpleMoneyFormat {

  public static final String EMPTY = "";

  public static final String ZERO = " 零 ";

  public static final String ONE = " 壹 ";

  public static final String TWO = " 贰 ";

  public static final String THREE = " 叁 ";

  public static final String FOUR = " 肆 ";

  public static final String FIVE = " 伍 ";

  public static final String SIX = " 陆 ";

  public static final String SEVEN = " 柒 ";

  public static final String EIGHT = " 捌 ";

  public static final String NINE = " 玖 ";

  public static final String TEN = " 拾 ";

  public static final String HUNDRED = " 佰 ";

  public static final String THOUSAND = " 仟 ";

  public static final String TEN_THOUSAND = " 万 ";

  public static final String HUNDRED_MILLION = " 亿 ";

  public static final String YUAN = " 元 ";

  public static final String JIAO = " 角 ";

  public static final String FEN = " 分 ";

  public static final String DOT = ".";

 

  private static SimpleMoneyFormat formatter = null;

  private HashMap chineseNumberMap = new HashMap();

  private HashMap chineseMoneyPattern = new HashMap();

  private NumberFormat numberFormat = NumberFormat.getInstance();

 

  private SimpleMoneyFormat() {

    numberFormat.setMaximumFractionDigits(4);

    numberFormat.setMinimumFractionDigits(2);

    numberFormat.setGroupingUsed(false);

 

    chineseNumberMap.put("0", ZERO);

    chineseNumberMap.put("1", ONE);

    chineseNumberMap.put("2", TWO);

    chineseNumberMap.put("3", THREE);

    chineseNumberMap.put("4", FOUR);

    chineseNumberMap.put("5", FIVE);

    chineseNumberMap.put("6", SIX);

    chineseNumberMap.put("7", SEVEN);

    chineseNumberMap.put("8", EIGHT);

    chineseNumberMap.put("9", NINE);

    chineseNumberMap.put(DOT, DOT);

 

    chineseMoneyPattern.put("1", TEN);

    chineseMoneyPattern.put("2", HUNDRED);

    chineseMoneyPattern.put("3", THOUSAND);

    chineseMoneyPattern.put("4", TEN_THOUSAND);

    chineseMoneyPattern.put("5", TEN);

    chineseMoneyPattern.put("6", HUNDRED);

    chineseMoneyPattern.put("7", THOUSAND);

    chineseMoneyPattern.put("8", HUNDRED_MILLION);

  }

 

  public static SimpleMoneyFormat getInstance() {

    if (formatter == null)

      formatter = new SimpleMoneyFormat();

    return formatter;

  }

 

  public String format(String moneyStr) {

    checkPrecision(moneyStr);

    String result;

    result = convertToChineseNumber(moneyStr);

    result = addUnitsToChineseMoneyString(result);

    return result;

  }

 

  public String format(double moneyDouble) {

    return format(numberFormat.format(moneyDouble));

  }

 

  public String format(int moneyInt) {

    return format(numberFormat.format(moneyInt));

  }

 

  public String format(long moneyLong) {

    return format(numberFormat.format(moneyLong));

  }

 

  public String format(Number moneyNum) {

    return format(numberFormat.format(moneyNum));

  }

 

  private String convertToChineseNumber(String moneyStr) {

    String result;

    StringBuffer cMoneyStringBuffer = new StringBuffer();

    for (int i = 0; i < moneyStr.length(); i++) {

      cMoneyStringBuffer.append(chineseNumberMap.get(moneyStr.substring(i, i + 1)));

    }

    // 拾佰仟万亿等都是汉字里面才有的单位，加上它们

    int indexOfDot = cMoneyStringBuffer.indexOf(DOT);

    int moneyPatternCursor = 1;

    for (int i = indexOfDot - 1; i > 0; i--) {

      cMoneyStringBuffer.insert(i, chineseMoneyPattern.get(EMPTY + moneyPatternCursor));

      moneyPatternCursor = moneyPatternCursor == 8 ? 1 : moneyPatternCursor + 1;

    }

 

    String fractionPart = cMoneyStringBuffer.substring(cMoneyStringBuffer.indexOf("."));

    cMoneyStringBuffer.delete(cMoneyStringBuffer.indexOf("."), cMoneyStringBuffer.length());

    while (cMoneyStringBuffer.indexOf(" 零拾 ") != -1) {

      cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf(" 零拾 "), cMoneyStringBuffer.indexOf(" 零拾 ") + 2, ZERO);

    }

    while (cMoneyStringBuffer.indexOf(" 零佰 ") != -1) {

      cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf(" 零佰 "), cMoneyStringBuffer.indexOf(" 零佰 ") + 2, ZERO);

    }

    while (cMoneyStringBuffer.indexOf(" 零仟 ") != -1) {

      cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf(" 零仟 "), cMoneyStringBuffer.indexOf(" 零仟 ") + 2, ZERO);

    }

    while (cMoneyStringBuffer.indexOf(" 零万 ") != -1) {

      cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf(" 零万 "), cMoneyStringBuffer.indexOf(" 零万 ") + 2, TEN_THOUSAND);

    }

    while (cMoneyStringBuffer.indexOf(" 零亿 ") != -1) {

      cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf(" 零亿 "), cMoneyStringBuffer.indexOf(" 零亿 ") + 2, HUNDRED_MILLION);

    }

    while (cMoneyStringBuffer.indexOf(" 零零 ") != -1) {

      cMoneyStringBuffer.replace(cMoneyStringBuffer.indexOf(" 零零 "), cMoneyStringBuffer.indexOf(" 零零 ") + 2, ZERO);

    }

    if (cMoneyStringBuffer.lastIndexOf(ZERO) == cMoneyStringBuffer.length() - 1)

      cMoneyStringBuffer.delete(cMoneyStringBuffer.length() - 1, cMoneyStringBuffer.length());

    cMoneyStringBuffer.append(fractionPart);

 

    result = cMoneyStringBuffer.toString();

    return result;

  }

 

 

  private String addUnitsToChineseMoneyString(String moneyStr) {

    String result;

    StringBuffer cMoneyStringBuffer = new StringBuffer(moneyStr);

    int indexOfDot = cMoneyStringBuffer.indexOf(DOT);

    cMoneyStringBuffer.replace(indexOfDot, indexOfDot + 1, YUAN);