(利用键值对)java中打印集合中字符出现次数

import java.util.*;
public class BoxingTest {
private static final int ONE=1;
public BoxingTest() {
}
public static void main (String[] args) {
Map hash=new HashMap();
for(int i=0;i<args.length;i++){
int freq=(Integer)hash.get(args[i])== null ? 0 : (Integer)hash.get(args[i]);
hash.put(args[i],freq==0 ? ONE : freq+1);
}
for(int i=0;i<hash.size();i++){
System.out.println (args[i]+"出现:"+hash.get(args[i])+"次");
}
//	System.out.println (hash);

}

}

import java.util.*;
public class BoxingTest{
private static final int ONE=1;
public BoxingTest(){
}
public static void main (String[] args) {
Map<String,Integer> map=new HashMap<String,Integer>();
for(int i=0;i<args.length;i++){
if(!map.containsKey(args[i])){
map.put(args[i],ONE);
}
else{
int freq=map.get(args[i]);
map.put(args[i],freq+1);
}
}
System.out.println (map.size()+"distinct words detected");
System.out.println (map);
}
}