map

 http://zhangshixi.iteye.com/blog/672697

                                          2011-6-14

 

http://zhangshixi.iteye.com/category/101360

                                          2011-6-14

 

 

 

http://blog.csdn.net/java2000_net/archive/2009/10/19/4696661.aspx

http://blog.csdn.net/java2000_net/archive/2009/03/19/4003498.aspx

http://blog.csdn.net/java2000_net/archive/2009/03/08/3968189.aspx

http://blog.csdn.net/java2000_net/archive/2008/12/26/3610370.aspx

http://blog.csdn.net/java2000_net/archive/2008/10/18/3097304.aspx

http://blog.csdn.net/java2000_net/archive/2008/10/17/3092206.aspx

http://blog.csdn.net/java2000_net/archive/2008/10/09/3039346.aspx

http://blog.csdn.net/java2000_net/archive/2008/10/06/3023517.aspx

http://blog.csdn.net/java2000_net/archive/2008/10/06/3019580.aspx

http://blog.csdn.net/java2000_net/archive/2008/09/25/2975636.aspx

 

                                                       

                                                                                                  2011-6-19

 

 

 

 

 

 

 

 

 

 

 

treemap可以存储 key值是实体，value值是LinkedList 吗？

                                                                2011-6-23

 

 

 

 

 public static String getReverseString (String s) {
 
  StringBuffer sb = new StringBuffer();
 
  for (int i = s.length(); i > 0; i--) {
   sb.append(s.substring(i - 1, i));
  }
 
  return sb.toString();
}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 //四个数为24.

package org.string.com;
import java.util.*;
// 把里面的l换成u;
public class TestString {
 public static void main(String[] args){
  int[]arr={0,20,4,0};
  
  List<Integer> list=new ArrayList<Integer>();
  list.add(arr[0]);
  for(int i=1;i<arr.length;i++){
   list=getaList(list,arr[i]);
  }
  
  boolean flag=false;
  
  for(int i=0;i<list.size();i++){
   if(list.get(i)==24){
    flag=true;
   }
  }
  System.out.println(flag);
}
 
 static List getaList(List<Integer> arr,int c){
  List<Integer> list=new ArrayList<Integer>();
  for(int i=0;i<arr.size();i++){
   list.add(arr.get(i).intValue()+c);
   list.add(arr.get(i).intValue()-c);
   list.add(arr.get(i).intValue()*c);
   if(c!=0)list.add(arr.get(i).intValue()/c);
   list.add(c-arr.get(i).intValue());
   list.add(arr.get(i).intValue()*c);
   if(arr.get(i).intValue()!=0)list.add(c/arr.get(i).intValue());
  }
  return list;
 }
}