java.util.Arrays.sort两种方式的排序（及文件读写练习）

public class SortTest{    public static void main(String args[]) throws IOException, ClassNotFoundException {        FileReader InWord = new FileReader(new File("words.txt"));        BufferedReader in = new BufferedReader(InWord);        String ws[] = new String[100];        String input;        int index = 0;        while((input=in.readLine())!=null)            ws[index++]=input;        Arrays.sort(ws, 0, index);              BufferedWriter out = new BufferedWriter(new FileWriter(new File("SortWords.txt")));               for(String s : ws){            if(s==null)              break;        System.out.println(s);            out.write(s, 0, s.length());        out.newLine();        }        in.close();        out.close();                 myTest myArray[] = new myTest[20];        in = new BufferedReader(new FileReader(new File("words.txt")));        index=0;        while((input=in.readLine())!=null){            ws[index++]=input;        }                for(int i=0; i index; ++i){           String str[]=ws[i].split(" ");           myArray[i] = new myTest(Integer.parseInt(str[0]), str[1]);           /*          开始的时候是这样写的， 奥心死了， 作死的节奏啊.....半天没找出来哪里出现了空指针              myArray[i].x=Integer.parseInt(str[0]);              myArray[i].name=str[1];       */        }        //1. 利用 自定义的 Comparator类中的compare 方法进行排序        Arrays.sort(myArray, 0, index, new myComparator());        //2. 利用 接口Comparable中的compareTo进行排序        //Arrays.sort(myArray, 0, index);        DataOutputStream dOut = new DataOutputStream(new FileOutputStream(new File("SortWords.txt")));        for(myTest tmp : myArray){            if(tmp==null) break;            System.out.println(tmp.x + " " + tmp.name);            dOut.writeInt(tmp.x);            dOut.writeChar( );            dOut.writeChars(tmp.name);            dOut.writeChar(\n);        }                 //如果想要利用ObjectIputStream反串行化构造对象，就必须保证源文件已经是 利用ObjectOutputStream 写入的，否则出现错误        ObjectOutputStream ObjOut = new ObjectOutputStream(new FileOutputStream(new File("SortWords.txt")));        for(int i=0; i index; ++i)           ObjOut.writeObject(myArray[i]);        //通过这种方法，可以避免ObjcetInputStream.readObject（）中产生EOFException异常        //ObjOut.writeObject(null);        index=0;        myTest inputTmp;        ObjectInputStream ObjIn = new ObjectInputStream(new FileInputStream(new File("SortWords.txt")));        try{          while((inputTmp=(myTest)ObjIn.readObject())!=null){             myArray[index++]=inputTmp;          }        }catch(IOException e){e.printStackTrace(); }finally{ ///放生的EOFException异常时IOException的子类          System.out.println("EOFException处理完毕！");        }        System.out.println("Finish！"); class myTest implements Comparable myTest , Serializable{     int x;     String name;     public myTest(){}     public myTest(int x, String name){         this.x=x;         this.name=name;     }           public int compareTo(myTest tmp){         if(x==tmp.x)            return name.compareTo(tmp.name);         else return x-tmp.x;     }     private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException{           //in.defaultReadObject();           x=(int)in.readInt();           name=(String)in.readObject();     }     private void writeObject(ObjectOutputStream out) throws IOException{           //out.defaultWriteObject();           out.writeInt(x);           out.writeObject(name);     } class myComparator implements Comparator myTest {     public int compare(myTest o1, myTest o2){        if(o1.x==o2.x)      return o1.name.compareTo(o2.name);        else return o1.x - o2.x;     }           public boolean equals(Object o1){         return true;     } }