KWIC：基于主程序/子程序风格的实现

总结，在类的main中直接使用类的方法，需要实例化一个对象去调用。否则就要将方法声明为静态类

import java.io.BufferedReader; 
import java.io.FileReader; 
import java.io.IOException; 
import java.util.ArrayList; 
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.StringTokenizer; 
public class Kwic2 {


/**
* @param args
*/
private  ArrayList kwicList=new ArrayList(); 
private  ArrayList lineTxt=new ArrayList();
private  BufferedReader inputFile;
public static void main(String[] args) {
// TODO Auto-generated method stub
        Kwic2 kwic2=new Kwic2();
        kwic2.input("D:\\test.txt");
kwic2.shift();
kwic2.alphabetizer();
kwic2.output();

}


public  void input(String fileName) {
try {
inputFile = new BufferedReader(new FileReader(fileName));
} catch (Exception e) {
System.err.print("wrong");
System.exit(1);
}
String line;
try {
while ((line = inputFile.readLine()) != null) {
lineTxt.add(line);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void output(){
Iterator it=kwicList.iterator();
System.out.println("the output is ");
while(it.hasNext()){
System.out.println(it.next());
}
}
public  void shift(){
//获取每个单词，存入tokens
       Iterator it=lineTxt.iterator();
       while(it.hasNext()){
        StringTokenizer token=new StringTokenizer(it.next());
ArrayListtokens=new ArrayList();
int i=0;
//循环添加单词

int count=token.countTokens();
while(i //System.out .println(token.nextToken().toString());
tokens.add(token.nextToken());
i++;
}

//display(tokens);
//切割各个单词，不断改变起始值和利用loop实现位移。
for(i=0;i StringBuffer lineBuffer=new StringBuffer();
int index=i;
for(int f=0;f
//从头继续位移
if(index>=count)
index=0;
//存入StringBuffer
lineBuffer.append(tokens.get(index));
lineBuffer.append(" ");
index++;
}
String tmp=lineBuffer.toString();
//System.out .println("the buffer is "+tmp);
kwicList.add(tmp);

}

       }

}


public  void alphabetizer(){
Collections.sort(this.kwicList,new AlphabetizerComparator());
}
private class AlphabetizerComparator implements Comparator{
@Override
public int compare(String o1,String o2){
if(o1==null&&o2==null){
throw new NullPointerException();
}
int compareValue=0;
char o1c=o1.charAt(0);
char o2c=o2.charAt(0);
compareValue=o1c-o2c;
return compareValue;

}

}
}