import java.io.*; //在测试时，这里有错误：无法解析java.util.Map$Entry.从必需的.class文件间接引用了它，怎么修改呢？
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.swing.JFrame;
import javax.swing.JTextArea;
public class T4 {
@SuppressWarnings("unchecked")
public static void main(String[] args) throws IOException {
String fileName = "Hello.txt";
RandomAccessFile file = new RandomAccessFile(new File(fileName), "r");
String content = null;
Map<String, Integer> map = new HashMap<String, Integer>();
while((content = file.readLine()) != null){
String[] ary = content.replaceAll("'|\\?|,|\\.|", "").split("\\s+");
for(String str : ary){
if(map.containsKey(str.trim())){
map.put(str, new Integer(map.get(str).intValue() + 1));
}else{
map.put(str.trim(), new Integer(1));
}
}
}
List list = new ArrayList();
/*下面for循环显示错误：此行的多个标记- Iterator 是原始类型。应该将对通用类型 Iterator<E> 的引用参数化
-类型 Map<String,Integer> 中的方法 entrySet（）引用缺少的类型 Map$Entry*/
for (Iterator iter = map.entrySet().iterator(); iter.hasNext();) {
Map.Entry<String, Integer> element = (Map.Entry<String, Integer>) iter.next();
list.add(new WordFreq(element.getKey(), element.getValue()));
}
/*下面一行显示的错误是：无法解析类型 java.util.Comparator。从必需的 .class 文件间接引用了它
- Comparator 无法解析为类型
- 类型 Collections 中的方法 sort（List<T>, Comparator<? super T>）引用缺少的类型
Comparator */
Collections.sort(list, new Comparator<WordFreq>(){
public int compare(WordFreq o1, WordFreq o2) {
return o1.getCount() < o2.getCount()? 1: -1;
}
});
int uniqueCount = 0;
final StringBuilder sb = new StringBuilder();
final String NEW_LINE = "\r\n";
for(Object obj: list){
WordFreq item = (WordFreq) obj;
uniqueCount += (item.getCount() == 1? 1: 0);
sb.append(item.toString()); //这里显示的错误是：无法解析类型 java.lang.CharSequence 从必需的 .class 文件间接引用了它
sb.append(NEW_LINE);
}
JFrame f = new JFrame();
JTextArea result = new JTextArea();
result.append("Total " + list.size() + " words found in " + fileName);
result.append(NEW_LINE);
result.append("Total " + uniqueCount + " words appear only once");
result.append(NEW_LINE);
result.append(NEW_LINE);
result.append(sb.toString());
f.add(result);
f.setVisible(true);
f.pack();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
class WordFreq{
private String word;
private int count;
public WordFreq(String word, int count){
this.word = word;
this.count = count;
}
public int getCount() {
return count;
}
public String toString(){
return word + "\t" + count;
}
}
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