scoresort.java

成绩分析器 可以用来实现一些相关功能

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.util.*;
public class ScoreSort extends JPanel{
	Hashtable baseInformation=null;
	Student student[];
	Three three[];
	int size;
	FileInputStream inOne=null;
  	ObjectInputStream inTwo=null;
  	FileOutputStream fos=null;
  	DataOutputStream dos=null;
  	File file=null,sortFile=null;
  	public ScoreSort(File file){
  		this.file=file;
  		try{
  			inOne=new FileInputStream(file);
            inTwo=new ObjectInputStream(inOne);
            baseInformation=(Hashtable)inTwo.readObject();
            inOne.close();
            inTwo.close();
        }
        catch(Exception ee){
        }
        size=baseInformation.size();
        student=new Student[size];
        three=new Three[size];
        Enumeration e=baseInformation.elements();
        int t=0;
        for(;e.hasMoreElements();)
        	student[t++]=(Student)e.nextElement();
        for(int i=0;i<size;i++)
        	three[i]=new Three(Integer.parseInt(student[i].getMath()),Integer.parseInt(student[i].getEnglish()),Integer.parseInt(student[i].getComputer()),student[i].getNumber(),student[i].getName());
       	sortFile=new File("各门课程排序.txt");
       	try{
       		fos=new FileOutputStream(sortFile);
       		dos=new DataOutputStream(fos);
       		int i,j,big;
       		Three temp;
       		for(i=0;i<size-1;i++){
       			big=i;
       			for(j=i+1;j<size;j++)
       				if(three[j].getMath()>three[big].getMath()) big=j;
       			if(big!=i){
       				temp=three[i];
       				three[i]=three[big];
       				three[big]=temp;
       			}
       		}
       		dos.writeUTF("***数学成绩排名***\r\n");	
     		for(i=0;i<size;i++)
       			dos.writeUTF(three[i].getNumber()+"***"+three[i].getName()+"***"+three[i].getMath()+"\r\n");
       		for(i=0;i<size-1;i++){
       			big=i;
       			for(j=i+1;j<size;j++)
       				if(three[j].getEnglish()>three[big].getEnglish()) big=j;
       			if(big!=i){
       				temp=three[i];
       				three[i]=three[big];
       				three[big]=temp;
       			}
       		}
       		dos.writeUTF("***英语成绩排名***\r\n");	
     		for(i=0;i<size;i++)
       			dos.writeUTF(three[i].getNumber()+"***"+three[i].getName()+"***"+three[i].getEnglish()+"\r\n");
       		for(i=0;i<size-1;i++){
       			big=i;
       			for(j=i+1;j<size;j++)
       				if(three[j].getComputer()>three[big].getComputer()) big=j;
       			if(big!=i){
       				temp=three[i];
       				three[i]=three[big];
       				three[big]=temp;
       			}
       		}
       		dos.writeUTF("***电脑成绩排名***\r\n");	
     		for(i=0;i<size;i++)
       			dos.writeUTF(three[i].getNumber()+"***"+three[i].getName()+"***"+three[i].getComputer()+"\r\n");
       		dos.close();
       		String warning="已在相应目录下生成各门成绩排序的文本文档,您可以查看相应文件!";
            JOptionPane.showMessageDialog(this,warning,"提示",JOptionPane.OK_CANCEL_OPTION);
       	}
       	catch(Exception ee){
       	}
    }
}