【小程序】JAVA实现从10~50中随机生成50个数，统计出现的数字及次数，输出出现最多的次数及对应的数字，按数字升序排列。

数组实现

/** * @(#)TongJi.java * * TongJi application * * @author kuroro * @version 1.00 2011/9/6 */ import java.util.Arrays;public class TongJi {         public static void main(String[] args) {         int[] a = new int[41];         for(int i=0;i<50;i++)          {         int count = (int)(Math.random()*41)+10;         System.out.print(count+" ");             a[count-10]++;         }         for(int j = 0 ; j< a.length; j++)         {            if(a[j]==0)        continue;           else            {               System.out.println();            System.out.println((j+10)+"出现了"+a[j]+"次");           }         }          int max=a[0];          for(int j=0;j<a.length;j++)          {          if(a[j]>max)          max = a[j];          }           System.out.println();           System.out.println("最大出现次数为"+max+"次");           for(int j=0;j<a.length;j++)           {           if(a[j]==max)           System.out.println("出现次数最多的数字为"+(j+10));           }                  }  }

 

MAP实现

import java.util.ArrayList;import java.util.Collection;import java.util.Collections;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.TreeMap;public class NumCount{  public static void main(String[] args){      TreeMap<Integer, Integer> map = new TreeMap<Integer, Integer>();        for(int i=0;i<50;i++)      {      int number = (int) (Math.random()*41)+10;       System.out.print(number+" ");        if(map.containsKey(number))      {      map.put(number,map.get(number)+1);      }else      {      map.put(number,1);      }      }        System.out.println();        Collection cols = map.values();        int max = Collections.max(cols);        List list = new ArrayList();        Iterator it = map.entrySet().iterator();        while(it.hasNext())        {        Map.Entry entry = (Map.Entry)it.next();        Integer key = (Integer)entry.getKey();        Integer val = (Integer)entry.getValue();        if(val==max)        {        list.add(key);        }        System.out.println(key+"出现的次数为："+val);        }         System.out.println("出现的最大次数为："+max);         Iterator it1 = list.iterator();         while(it1.hasNext())         {         System.out.println("这些数字是："+it1.next());         }  }}