杀鸡不用牛刀吧,用数组,开销小一些~~import java.util.Scanner;public class Test { public static void main(String[] args) { Scanner s = new Scanner(System.in); String str = s.nextLine(); int[] cnt = new int[128]; char[] chars = str.toCharArray(); for (int i = 0; i < chars.length; i++) { cnt[chars[i]]++; } } }
/** * 输入一串字符串 以逗号隔开,然后把每个的字符串统计一下出现了几次,最后以出现次数由大到小排列该元素 * @author think * */ import java.io.*; import java.util.*; public class Split { public static void main(String[] args) throws Exception { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String str = br.readLine(); String[] s = str.split(",");
HashMap<String,Integer> hm = new HashMap<String,Integer>();
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;public class TestTreeMap { /**
* @param args
*/
public static void main(String[] args) {
String str ="a,c,b,b,c,d,c,s,c,b,c,d,s,c,b,d,s,a,a,a,a,a,a,s,d,f,f,b,d";
String[] strArr = str.split(",");
TreeMap countMap = new TreeMap();
for(int i=0;i<strArr.length;i++){
if(!countMap.containsKey(strArr[i])){
countMap.put(strArr[i], 1);
}else{
int value = (Integer)countMap.get(strArr[i]);
countMap.put(strArr[i], value+1);
}
}
System.out.print("排序前::"+countMap);
List<Map.Entry<String, Integer>> info = new ArrayList<Map.Entry<String, Integer>>(countMap.entrySet());
Collections.sort(info, new Comparator<Map.Entry<String, Integer>>() {
public int compare(Map.Entry<String, Integer> obj1, Map.Entry<String, Integer> obj2) {
return obj2.getValue() - obj1.getValue();
}
});
for (int j = 0; j<info.size();j++) {
System.out.println(info.get(j).getKey() + "------->" + info.get(j).getValue());
}
}
}
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
String str = s.nextLine();
int[] cnt = new int[128];
char[] chars = str.toCharArray();
for (int i = 0; i < chars.length; i++) {
cnt[chars[i]]++;
}
}
}
/**
* 输入一串字符串 以逗号隔开,然后把每个的字符串统计一下出现了几次,最后以出现次数由大到小排列该元素
* @author think
*
*/
import java.io.*;
import java.util.*;
public class Split {
public static void main(String[] args) throws Exception {
BufferedReader br = new BufferedReader(new
InputStreamReader(System.in));
String str = br.readLine();
String[] s = str.split(",");
HashMap<String,Integer> hm = new HashMap<String,Integer>();
for(int i=0; i<s.length; i++) {
boolean ifAdd = true;
Set<String> ks = hm.keySet();
for(String str1 : ks) {
if(str1.equals(s[i])) {
int k = hm.get(str1);
hm.put(s[i], k+1);
ifAdd = false;
break;
}
}
if(ifAdd) {
hm.put(s[i], 1);
}
}
Set<String> ss = hm.keySet();
int[] a = new int[ss.size()];
int k = 0;
for(String str1 : ss) {
int i = hm.get(str1);
a[k++] = i;
}
for(int i=0; i<a.length-1; i++) {
for(int j=i+1; j<a.length; j++) {
if(a[i] < a[j]) {
int t = a[i];
a[i] = a[j];
a[j] = t;
}
}
}
System.out.println(Arrays.toString(a));
String[] b = new String[ss.size()];
for(String str1 : ss) {
int i = hm.get(str1);
for(int m=0; m<a.length; m++) {
System.out.println(a[m]);
if(a[m] == i) {
if(b[m] != null) {
continue;
}
b[m] = str1;
break;
}
}
}
for(int i=0; i<b.length; i++) {
System.out.println(b[i] + ":" + a[i]);
}
}
}
import java.util.Map;
import java.util.Scanner;public class Array
{
@SuppressWarnings("unchecked")
public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
System.out.println("请输入一串字符串,用,号隔开...");
String InputStr = input.next();
String chars[] = InputStr.split(",");
Map<String, Integer> map = new HashMap<String, Integer>();
for (String s : chars)
{
if (!map.containsKey(s))
{
map.put(s, 1);
}
else
{
map.put(s, map.get(s) + 1);
}
}
for (String key : map.keySet())
{
System.out.println(key + "\t" + map.get(key));
}
int temp = 0;
int count=0;
for (String s : map.keySet())
{
temp = map.get(s);
for (String key : map.keySet())
{
count=map.get(key);
if (count > temp)
{
temp=count;
s = key;
}
}
System.out.println(s);
map.put(s, -1);
}
}
}