统计给出的字符串中出现次数最多的字符

package com.flywater.sf;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;

public class FirstRabbit
{
/**
* 统计给出的字符串中出现次数最多的字符
*/
public static void countCharacterInString(){
int a = (int)(Math.random()*1000);
System.out.println(a);
String target = "hello world what about you today";
char ch[] = target.toCharArray();
Map<Character, Integer> map = new HashMap<Character, Integer>();
for(Character c:ch){
if(Character.isWhitespace(c)) continue;
if(map.containsKey(c) == false){
map.put(c, 1);
}else{
map.put(c, map.get(c)+1);
}
}
Set<Character> set = map.keySet();
Iterator iter = set.iterator();
Integer count=0;
Character key = new Character(' ');

while(iter.hasNext()){
Character ccc = (Character)iter.next();
System.out.println(ccc +": "+ map.get(ccc));
if(map.get(ccc) > count){
count = map.get(ccc);
key = ccc;
}
}

System.out.println(key.toString()+" "+ count);
}
/**
* 统计随机数出现最多的数字
*/
public static void getRedom(){
Map<Integer, Integer> map = new HashMap<Integer, Integer>();
for(int i=0;i<2000;i++) {
Integer rm = new Integer((int)(Math.random()*20));
if(map.containsKey(rm)==false) {
map.put(rm, 1);
} else {
map.put(rm, +map.get(rm)+1);
}
}
System.out.println(map);
}

}