ImplicitlyCallMain类

/*** */
package com.jason.kwic.implicitlyCall;import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Scanner;/*** @author jasonzhang**/
public class ImplicitlyCallMain {public static void main(String[] args) throws IOException {Shift shift = new Shift();Alphabetizer sort = new Alphabetizer();//增加观察者shift.addObserver(sort);File infile = new File("d:\\temp\\mykwic_in.txt");Scanner sc = new Scanner(infile);String tempLine = null;System.out.println("input is");while (sc.hasNextLine()) {tempLine = sc.nextLine();System.out.println(tempLine);shift.addLine(tempLine);}List<String> sortedLines = sort.getSortedLines();System.out.println("output is");for (String line : sortedLines) {System.out.println(line);}}
}

Shift类

/*** */
package com.jason.kwic.implicitlyCall;import java.util.ArrayList;
import java.util.List;
import java.util.Observable;
import java.util.StringTokenizer;/*** @author jasonzhang**/
public class Shift extends Observable  {public void addLine(String line) {ArrayList<String> wordList = new ArrayList<String>();StringTokenizer st = new StringTokenizer(line, " ");while (st.hasMoreTokens()) {wordList.add(st.nextToken());}int wordNums = wordList.size();StringBuilder tempLine = new StringBuilder();//System.out.println("shifed is");List<String> shiftedLines = new ArrayList<String>();for (int i=0; i<wordNums; i++) {for (int j=(wordNums - 1 -i); j < wordNums; j++) {tempLine.append(wordList.get(j)).append(' ');}for (int k=0; k<(wordNums - 1 -i); k++) {if (k != (wordNums - i - 2)) {tempLine.append(wordList.get(k)).append(' ');} else {tempLine.append(wordList.get(k));}}//System.out.println(tempLine.toString());//this.shifedLines.add(tempLine.toString());shiftedLines.add(tempLine.toString());tempLine.delete(0, tempLine.length());}super.setChanged();super.notifyObservers(shiftedLines);}}

Alphabetizer类

/*** */
package com.jason.kwic.implicitlyCall;import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Observable;
import java.util.Observer;/*** @author jasonzhang**/
public class Alphabetizer implements Observer {private List<String> sortedLines = new ArrayList<String>();/* (non-Javadoc)* @see java.util.Observer#update(java.util.Observable, java.lang.Object)*/@Overridepublic void update(Observable o, Object arg) {List<String> lines = (List<String>) arg;this.sortedLines.addAll(lines);Collections.sort(this.sortedLines, new AlphaabetizerComparator());}public List<String> getSortedLines() {return this.sortedLines;}private class AlphaabetizerComparator implements Comparator<String> {@Overridepublic int compare(String o1, String o2) {if (o1 == null || o2 == null) {throw new NullPointerException();}int compareValue = 0;char o1FirstCharacter = o1.charAt(0);char o2FirstCharacter = o2.charAt(0);if(this.isLetter(o1FirstCharacter) && this.isLetter(o2FirstCharacter)) {//如果是小写的字母的值，则转成对应的大写的字母的值o1FirstCharacter = this.toUpperCase(o1FirstCharacter);o2FirstCharacter = this.toUpperCase(o2FirstCharacter);compareValue = o1FirstCharacter - o2FirstCharacter;} else {throw new RuntimeException("必须是字母");}return compareValue;}private boolean isLetter(char c) {return (c >= 65 && c <= 90) || (c >= 97 && c <= 122);}private char toUpperCase(char c) {if (Character.isLowerCase(c)) {return Character.toUpperCase(c);}return c;}}
}

实际上就是观察者模式，使用了jdk中的Observable和Observer