import java.io.*;import java.util.*;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;    }}