###- The number of times or the number of elements appearing in a string in a statistical text ?
- Talk is cheap,show me your code ~
public class Lookup{
public static void main(String[] args){
String s = "the instruction set of the Java virtual machine distinguishes its operand types using instructions intended to operate on values of specific types";
String[] word = s.split(" ");
Map<String,Integer> m = new HashMap<String,Integer>();
//用word初使化m,m中包含了所有不重复的单词
for(int j=0;j<word.length;j++){
m.put(word[j],0);
}
Set<String> set = m.keySet();
//用word中的每个单词与m中的单词比较,发现相同的就统计一次
for(int i=0;i<word.length;i++){
Iterator<String> it = set.iterator();
while(it.hasNext()){
String k = it.next();
if(word[i].equals(k)){
int c = m.get(k);
c++;
m.put(word[i],c);
}
}
}
System.out.println(m);
}
}