public class Test { public int count(String str, char c) { int n = 0;// 计数 for (int i = 0; i < str.length(); i++) { char ch = str.charAt(i); if (ch == c) { n++; } } return n; } public static void main(String[] args) { Test t = new Test(); String str = "java@list#有中文啊,jiu zhemechanglejava@list#有中文啊,jiu zhemechangle"; int n = t.count(str, '中'); System.out.println(n); } }
public static void main(String[] args) { // TODO Auto-generated method stub String str = "java@list#有中文啊,jiu zhemechangle"; char []arr = str.toCharArray(); HashMap<String, Integer> map = new HashMap<String, Integer>();
for(int i =0 ;i<arr.length;i++){ char c = arr[i]; String [] s = str.split(c+""); if(s == null || s.length ==0){ map.put(c+"", 0); }else{ map.put(c+"", s.length-1); } }
HashMap<Character, Integer> map = new HashMap<Character, Integer>();
for (int i = 0; i < str.length(); i++){
char ch = str.charAt(i);
if(map.get(ch) == null){
map.put(ch, 1);
}else{
int cnt = map.get(ch);
map.put(ch, ++cnt);
}
}
for(Entry<Character, Integer> entry : map.entrySet()){
System.out.println(entry.getKey() + ":" + entry.getValue());
}
}
public int count(String str, char c) {
int n = 0;// 计数
for (int i = 0; i < str.length(); i++) {
char ch = str.charAt(i);
if (ch == c) {
n++;
}
}
return n;
} public static void main(String[] args) {
Test t = new Test();
String str = "java@list#有中文啊,jiu zhemechanglejava@list#有中文啊,jiu zhemechangle";
int n = t.count(str, '中');
System.out.println(n);
}
}
// TODO Auto-generated method stub
String str = "java@list#有中文啊,jiu zhemechangle";
char []arr = str.toCharArray();
HashMap<String, Integer> map = new HashMap<String, Integer>();
for(int i =0 ;i<arr.length;i++){
char c = arr[i];
String [] s = str.split(c+"");
if(s == null || s.length ==0){
map.put(c+"", 0);
}else{
map.put(c+"", s.length-1);
}
}
Iterator it = map.entrySet().iterator();
while(it.hasNext()){
Map.Entry entry = (Map.Entry)it.next();
System.out.println(entry.getKey()+"--"+entry.getValue());
}
}
算法...网上烂大街了 ( ▔___▔)y-~