map
?http://zhangshixi.iteye.com/blog/672697
????????????????????????????????????????? 2011-6-14
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http://zhangshixi.iteye.com/category/101360
????????????????????????????????????????? 2011-6-14
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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
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???????????????????????????????????????????????????????
???????????????????????????????????????????????????????????????????????????????????????????????? ?2011-6-19
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treemap可以存储 key值是实体，value值是LinkedList 吗？??????????????????????????????????????????????????????????????? 2011-6-23?
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?public static String getReverseString (String s) {
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? StringBuffer sb = new StringBuffer();
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? for (int i = s.length(); i > 0; i--) {
?? sb.append(s.substring(i - 1, i));
? }
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? return sb.toString();
}
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?//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;
?}
}