随机生成50个数字(整数),每个数的范围是【10,,50】,统计每个数字出现的次数以及出现次数最多的数字与它的个数,最后将每个数字及其出现次数打印出来,如果某个数字出现的次数为0,则不要打印它,打印时按照数字的升序排列
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* @param args
*/
public static void main(String[] args) {
int [] arr = new int[50];
Map<Integer, Integer> map = new HashMap<Integer, Integer>();
Random random = new Random(System.currentTimeMillis());
for(int i=0;i<50;i++){
arr[i] = 10+random.nextInt(40);
if(map.get(arr[i])==null){
map.put(arr[i], 1);
}else{
map.put(arr[i],(map.get(arr[i])+1));
}
}
Set keySet = map.keySet();
Iterator it = keySet.iterator();
while(it.hasNext()){
Integer temp = (Integer)it.next();
if(map.get(temp)>1){
System.out.println(temp+" : "+map.get(temp));
}
} }
}
{
public static void main(String[] args)
{
int[] count = new int[41];
Random random = new Random(); for (int i = 0; i < 50; i++)
{
int number = random.nextInt(41) + 10;
System.out.print(number + " ");
count[number - 10]++;
}
for (int i = 0; i < count.length; i++)
{
if (0 == count[i])
{
continue;
}
System.out.println((i + 10) + " " + "出现次数为" + " " + count[i]);
}
int max = count[0];
for (int i = 0; i < count.length; i++)
{
if (max < count[i])
{
max = count[i];
}
}
System.out.println("出现的最多次数为" + max + "次");
for (int i = 0; i < count.length; i++)
{
if (max == count[i])
{
System.out.println("出现最多次数的数有:" + (i + 10));
}
}
}
}
int[] arr = new int[50];
Map<Integer, Integer> map = new TreeMap<Integer, Integer>();
Random random = new Random(System.currentTimeMillis());
for (int i = 0; i < 50; i++) {
arr[i] = 10 + random.nextInt(40); if (map.get(arr[i]) == null) {
map.put(arr[i], 1);
} else {
map.put(arr[i], (map.get(arr[i]) + 1));
}
} Iterator<Integer> iter = map.keySet().iterator(); int maxkey = iter.next();
int maxvalue = map.get(maxkey); System.out.println(maxkey + " " + map.get(maxkey));
for (; iter.hasNext();) {
int nextkey = iter.next();
if (map.get(nextkey) > maxvalue) {
maxvalue = map.get(nextkey);
maxkey = nextkey;
} System.out.println(nextkey + " " + map.get(nextkey));
} System.out.println("max:" + maxkey + " " + maxvalue);
}