grid.java

网络版的学生成绩管理系统

import java.awt.*;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
public class Grid extends Panel
{
   private static final int NUMBER_OF_ROWS = 10;
   private Row[] r; 
   private int rowCount;
   private ArrayList students;
   private StudentListApp.rowClickAction rcListener;
   public Grid()
   {
      students=new ArrayList();
	  setLayout( new GridLayout(11,1) );//set layout 11行
      add( new GridLabel() );
      
      r = new Row[NUMBER_OF_ROWS];      
      for ( int count = 0 ; count < NUMBER_OF_ROWS ; count++ )
      {
         r[count] = new Row();//add rows
         add(r[count]);
         
      }
   }
   public void addrcListener(StudentListApp.rowClickAction l){
	   this.rcListener=l;
	   for(int i=0;i<NUMBER_OF_ROWS;i++)
		   r[i].addrcListener(this.rcListener);
   }
   public int search(String idNum){
	   for(int i=0;i<students.size();i++){	
		   Student stu=(Student)students.get(i);
		   if(stu.getId().equals(idNum)){
			  return i;
		   }
			   
	   }
	   return -1;
   }
   public void addRow(Student stu){
	   	if(search(stu.getId())!=-1)
			  throw new IllegalArgumentException("该ID已存在！");
	   
	   if(rowCount<NUMBER_OF_ROWS){
		   students.add(stu);
		   refreshRows();
	   }
	   else
		   throw new IllegalArgumentException("学生数已满!");
   }
   public void delRow(String idNum){
	   int idx=search(idNum);
	   if(idx!=-1){
			 students.remove(idx);
			 refreshRows();
			 return;
	   }				   
	   throw new IllegalArgumentException("未找到该项,删除失败!");
   }
   public void editRow(Student stu){
	   int idx=search(stu.getId());
	   if(idx!=-1){
		   students.remove(idx);//删除原对象
		   students.add(stu);//加入新对象 相同ID.
		   refreshRows();
	   }else
		   throw new IllegalArgumentException("未找到该项,修改失败!");
   }
   public void sortRow(){
	   Comparator comp = new Mycomparator();
       Collections.sort(students,comp);  
       refreshRows();
   }
   public Student getRow(String id){
	   int idx=search(id);
	   if(idx!=-1)
		   return (Student)students.get(idx);
	   else
		   return null;
   }
   /**
    * 刷新各行数据
    */
   public void refreshRows(){
	   for(int i=0;i<r.length;i++)
		   r[i].clearAll();
	   for(int i=0;i<students.size();i++){
		   r[i].setTextFields((Student)students.get(i));
	   }
   }
   
}

class Mycomparator implements Comparator{

    public int compare(Object o1,Object o2) {
        Student s1=(Student)o1;
        Student s2=(Student)o2;  
       if(s1.getScore()<s2.getScore())
           return 1;
       else
           return 0;
       }

}