班级排序怎么弄？

Question

有一个班级集合 属性为班级人数classnum和班级名字classname
对其排序，按人数排，人数相同在按班级名字排，请问怎么排序啊？要用什么方法哦 ？

Answer 1

用冒泡算法
我在网上搜了一个例子,改写了一下,供你参考
public class BubbleSort 
{ 
  /**        *对数组obj中的元素以冒泡排序算法进行排序        */ 
       public void sort(int[] obj) 
       {     if (obj == null)               {    throw new NullPointerException("The argument can not be null!"); 
              } 
              int tmp; 
              for (int i = 0 ;i < obj.length ;i++ ) 
              {    //切记，每次都要从第一个开始比。最后的不用再比。 
                     for (int j = 0 ;j < obj.length - i - 1 ;j++ ) 
                     {   //对邻接的元素进行比较，如果后面的小，就交换 
                            if (obj[j]-(obj[j + 1]) > 0) 
                            {  tmp = obj[j]; 
                                   obj[j] = obj[j + 1]; 
                                   obj[j + 1] = tmp; 
                            }   } 
              }  } 
       public static void main(String[] args){
        BubbleSort bs=new BubbleSort();
        int[] i={21,12,3,34,0,3,8,9};
        bs.sort(i);
        for(int j=0;j<i.length;j++){
        System.out.println(i[j]);
        }
       }
}

Answer 2

去我blog看最新一篇的文章吧 

Answer 3

public class Count{
     public void sort(String[] obj) 
      {    if (obj == null)               {    throw new NullPointerException("The argument can not be null!"); 
              }
                int[] math=new int[obj.length];
                String[] str=new String [obj.length];
                for(int i=0;i<obj.length;i++){
                int leftbrace=obj[i].indexOf('[');
                str[i]=obj[i].substring(0,leftbrace);    
                String port=obj[i].substring(leftbrace+1,obj[i].length()-1); 
                math[i]=Integer.parseInt(port);              }
                
              int tmp; 
               String s;
              for (int i = 0 ;i < math.length ;i++ ) 
              {      
                    for (int j = i+1 ;j < math.length ;j++ ) 
                    {   
                            if (math[i]-math[j] > 0) 
                            {     tmp = math[i]; 
                                  math[i] = math[j]; 
                                  math[j] = tmp;
                                   s = str[i]; 
                                  str[i] = str[j]; 
                                  str[j] = s;
                                                                     
                            }  } 
              } 
              for(int i=0;i<math.length;i++){
               if(math[i]==math[i+1]){
                 if(str[i].compareTo(str[i+1])>0){
                                  tmp = math[i]; 
                                  math[i] = math[i+1]; 
                                  math[i+1] = tmp;
                                  s = str[i]; 
                                  str[i] = str[i+1]; 
                                  str[i+1] =s;
                               }
                 
                
             
                
                  }  
               System.out.println(str[i]+math[i]); 
        } 
              System.out.println(str[math.length-1]+math[math.length-1]);
      }   
      public static void main(String[] args){ 
      try{
      Count bs=new Count(); 
      
      String[] bj={"计算机一班[43]","计算机二班[46]","计算机三班[43]","计算机四班[50]"}; 
      bs.sort(bj); 
      
      }
      catch(ArrayIndexOutOfBoundsException e){
       e.printStackTrace();
        
      }
        
      } 
} 

Answer 4

XIEXIExiexi谢谢啊  ，学到了很多 看了justinavril 的BLOG，，不错