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public class Test {
public static void main(String[] args) {
String[] a = { "ads", "awww", "fdgfdf", "fvdsfc", "hyjutfrdf" };
Map<Character, Integer> map = new HashMap<Character, Integer>();
for (int n = 0; n < a.length; n++) {
for (int i = 0; i < a[n].length(); i++) {
Integer fre = map.get(a[n].charAt(i));//不存在返回null否则返回当前出现的次数
map.put(a[n].charAt(i), fre == null ? 1 : fre + 1);
}
}
System.out.println(map);
}
}
public class Test {
public static void main(String[] args) {
String[] a={"ads","awww","fdgfdf","fvdsfc","hyjutfrdf"};
Map<String,Integer>map=new HashMap<String,Integer>();
for(int n=0;n<a.length;n++){
for(int i=0;i<a[n].length();i++){
Integer fre=map.get(String.valueOf(a[n].charAt(i)));
map.put(String.valueOf(a[n].charAt(i)), fre==null ? 1:fre+1);
}
}
System.out.println(map);
}
}
运行结果{f=7, g=1, d=5, c=1, a=2, j=1, h=1, w=3, v=1, u=1, t=1, s=2, r=1, y=1}import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
public class StringCount
{
public static void main(String[] args)
{
String[] arr ={"ads","awww","fdgfdf","fdgfdf","fdgfdf"};
System.out.println(getCount(arr));;
}
private static String getCount(String[] strs)
{
StringBuilder builder = new StringBuilder();
for(int x=0; x<strs.length; x++)
{
builder.append(strs[x]);
}
String s = builder.toString();
char[] arr = s.toCharArray();
Map<Character,Integer> map = new TreeMap<Character,Integer>();
int count = 1;
for(int x=0; x<arr.length; x++)
{
if(!(arr[x]>='a' && arr[x]<='z' || arr[x]>='A' && arr[x]<='Z'))
continue;
if(!(map.containsKey(arr[x])))
map.put(arr[x], count);
else
count = map.get(arr[x]) + 1;
map.put(arr[x], count);
count = 1;
}
StringBuilder sb = new StringBuilder();
Iterator<Map.Entry<Character, Integer>> it = map.entrySet().iterator();
while(it.hasNext())
{
Map.Entry<Character, Integer> me = it.next();
char key = me.getKey();
int value = me.getValue();
sb.append(key+":("+value+")");
}
return sb.toString();
}
}
public class Hello {
public static void main(String[] args) {
String [] a = {"ads", "awww", "fdgfdf", "fvdsfc", "hyjutfrdf"};
int[] frequence = new int[256];
for (String str : a) {
for (int i = 0; i < str.length(); ++i) {
frequence[str.charAt(i)]++;
}
}
for (int i = 0; i < frequence.length; ++i) {
if (frequence[i] != 0) {
System.out.printf("%s: %d\n", (char)i, frequence[i]);
}
}
}
}
a: 2
c: 1
d: 5
f: 7
g: 1
h: 1
j: 1
r: 1
s: 2
t: 1
u: 1
v: 1
w: 3
y: 1
public class times {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String[] s = {"ads","awww","fdgfdf","fvdsfc","hyjutfrdf"};
int[] len = new int[26];
for(int i = 0;i < s.length;i++){
for(int j = 0;j <s[i].length();j++){
len[s[i].charAt(j) - 'a']++;
}
}
for(int i = 0;i < 26;i++){
char temp;
temp = (char)('a' + i);
System.out.print(temp);
System.out.println(":"+len[i]);
}
}
}