Hashtable ht = new Hashtable();
for(int i = 0;i<lengthList.size();i++){ //用 Arraylist 生成 HashTable
ArrayList twoList = new ArrayList();
twoList = (ArrayList) lengthList.get(i);
int keyname = i++;
ht.put(keyname, twoList.get(1).toString().trim());
System.out.println(twoList.get(1).toString().trim());
System.out.println(keyname);
}//for()
总是得不出想要的结果!好像不能把数据存入hashtable表中去?输出的答案总是不对?
for(int i = 0;i<lengthList.size();i++){ //用 Arraylist 生成 HashTable
ArrayList twoList = new ArrayList();
twoList = (ArrayList) lengthList.get(i);
int keyname = i++;
ht.put(keyname, twoList.get(1).toString().trim());
System.out.println(twoList.get(1).toString().trim());
System.out.println(keyname);
}//for()
总是得不出想要的结果!好像不能把数据存入hashtable表中去?输出的答案总是不对?
for(int i = 0;i <lengthList.size();i++){ //用 Arraylist 生成 HashTable ArrayList twoList = new ArrayList();
twoList = (ArrayList) lengthList.get(i);
int keyname = i++; ht.put(keyname, twoList.get(1).toString().trim());
System.out.println(twoList.get(1).toString().trim());
System.out.println(keyname);
}//
因为 i ++ 执行了两次。
该成如下试试: Hashtable ht = new Hashtable();
int j=0;
for(int i = 0;i <lengthList.size();i++){ //用 Arraylist 生成 HashTable
ArrayList twoList = new ArrayList();
twoList = (ArrayList) lengthList.get(i);
int keyname = j++;
ht.put(keyname, twoList.get(1).toString().trim());
System.out.println(twoList.get(1).toString().trim());
System.out.println(keyname);
}//
import java.util.ArrayList;
import java.util.Hashtable;
public class aa{
public static void main(String[] args){
Hashtable ht = new Hashtable(10);
ArrayList twoList = new ArrayList();
for(int i = 0;i <10;i++){ //用 Arraylist 生成 HashTable
twoList.add(""+i);
String keyname = ""+i;
ht.put(keyname, twoList.add(""+i));
System.out.println(twoList.get(i).toString().trim());
// System.out.println(keyname);
}//for()
}
}
右面是一个object,要赋值给左面的arraylist对象,可以吗
Hashtable ht = new Hashtable();
for(int i = 0;i <lengthList.size();i++){ //用 Arraylist 生成 HashTable
ArrayList twoList = new ArrayList();
twoList = (ArrayList) lengthList;
int keyname = i++;
ht.put(keyname, twoList.get(i).toString().trim());
System.out.println(twoList.get(i).toString().trim());
System.out.println(keyname);
}//for()
仿佛LZ是要把 一个链表中的元素存入Hashtable,
如果是那么 首先请遍历链表.然后再将 KEY 和 VALUE 添加入Hashtable.
应为你给的不是完全的程序所以很难明白你的意图,要明白看别人写的程序要比自己写程序还难,何况你给的不是完整的程序.