用ArrayList如何拆分字符串并统计出其中每个单词的数目

[kuikui06]

如有一个字符串：String target = "java is very good , java ";

如何把target中的每个单词统计出来，只能用ArrayList，HashMap的不要。

谢谢

[joejoe1991]

可以用String.split("\\s");
分割字符串
或者用正则表达式。我试着写了一个
Pattern pattern = Pattern.compile("(?<=\\s*)\\w+(?=(\\s+|\\p{Punct}))");

把匹配到的字符串或者分割出来的字符串加到ArrayList里就行了

[kuikui06]

拆分我会，现在的问题是添加到ArrayList之后统计单词时如何去掉统计过的单测？

public class ArrayListTest {
public static void main(String[] agrs) {
String target = "java is good , java ? ha ha , yes java ";
String[] strTemp = target.split(" ");
List<String> ls1 = new ArrayList<String>();
List<String> ls2 = new ArrayList<String>();
Iterator it1 = null;
Iterator it2 = null;
int i ;
for(i=0; i<strTemp.length; i++){
ls1.add(strTemp[i]);
ls2.add(strTemp[i]);
}
it1 = ls1.iterator();
it2 = ls2.iterator();
while(it1.hasNext()) {
i = 0;
String temp = (String)it1.next();

/* if(ls1.contains(temp2)) {
continue ;
} else {
temp2 = temp;
}*/
while(it2.hasNext()) {
if(temp.equals(it2.next())) {
i++;
}
}
it2 = ls2.iterator();
System.out.print(temp+"="+i+"\t");
}
}
}
上面的程序打印出来的结果是：
java=3 is=1 good=1 ,=2 java=3 ?=1 ha=2 ha=2 ,=2 yes=1 java=3
请问那位高人怎么去掉重复打印次数

[kuikui06]

想了一下，就是有点土，可以随便看看

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;


public class ArrayListTest {
public static void main(String[] agrs) {
String target = "java is good , yes , java is very good";
String[] strTemp = target.split(" ");
List<String> ls1 = new ArrayList<String>();
List<String> ls2 = new ArrayList<String>();
List<String> ls3= new ArrayList<String>();
Iterator it1 = null;
Iterator it2 = null;
int i ;
for(i=0; i<strTemp.length; i++){
ls1.add(strTemp[i]);
ls2.add(strTemp[i]);
}
it1 = ls1.iterator();
it2 = ls2.iterator();
while(it1.hasNext()) {
i = 0;
String temp = (String)it1.next();
while(it2.hasNext()) {
if(temp.equals(it2.next())) {
i++;
}
}
it2 = ls2.iterator();
if(!(ls3.contains(temp))) {
ls3.add(temp);

ls3.add(Integer.toString(i));
}
}
System.out.println(ls3);
}
}

[joejoe1991]

import java.util.ArrayList;
import java.util.regex.*;

public class test {
public static void main(String[] agrs) {
String str= "java is good yes java is very good a i love java very much";
String[] fenge=str.split("[^\\w]");
System.out.println(fenge.length);
ArrayList list=new ArrayList();

for (int i=0;i<fenge.length;i++)
{
if (list.contains(fenge[i])==false) {
Pattern pattern=Pattern.compile("\\b"+fenge[i]+"\\b");
Matcher matcher=pattern.matcher(str);

int nums=0;
while(matcher.find())
{
nums++;
}

System.out.println(fenge[i]+":"+nums);
list.add(fenge[i]);
}

}

}
}

[shan1119]

private void test(){

String target = "java is very good , java ";
String arr[] = target.split("[^a-zA-Z]+");
ArrayList al = new ArrayList();
ArrayList alResult = new ArrayList();

for(int i=0;i<arr.length;i++)al.add(arr[i]);
for(int i=0;i<al.size();i++){
if(!alResult.contains(al.get(i))){
alResult.add(al.get(i));
alResult.add("1");
}else{
int index = alResult.indexOf(al.get(i));
int len = new Integer(""+alResult.get(index+1)).intValue();
alResult.remove(index+1);
alResult.add(index+1,""+(++len));
}
}

for(int i=0;i<alResult.size();i+=2)
System.out.print(alResult.get(i)+"="+alResult.get(i+1)+"\t");

}

[稽姬]

正则替换 split分割