免責聲明:我使用this Post,作爲
List<Object>
到List<String>
和this Post字符串的Java的List<String>
參考JavaScript數組。轉換列表<Object>爲字符串返回空結果
我已經List<Seat>
,我想在分離String
逗號這一切的價值觀,我想用這種方式
import java.util.*;
import java.lang.*;
class Rextester
{
public Rextester(){
Seat seat1 = new Seat();
seat1.setSeatNumber(1);
Seat seat2 = new Seat();
seat2.setSeatNumber(2);
Seat seat3 = new Seat();
seat3.setSeatNumber(3);
List<Seat> seatList = new ArrayList<Seat>();
seatList.add(seat1);
seatList.add(seat2);
seatList.add(seat3);
Utility util = new Utility();
String stringSeats = util.toJavascriptArray(seatList);
System.out.println("JavaScriptArray is " + stringSeats);
}
public static void main(String args[])
{
new Rextester();
}
private class Seat {
private Integer seatNumber;
public Integer getSeatNumber() {
return this.seatNumber;
}
public void setSeatNumber(Integer seatNumber) {
this.seatNumber = seatNumber;
}
public String toString() {
return ""+ seatNumber;
}
}
private class Utility {
public String toJavascriptArray(List<Seat> listSeats){
List<String> strings = new ArrayList<String>();
for (Seat object : listSeats) {
strings.add(object != null ? object.toString() : null);
}
String[] arr = new String[strings.size()];
arr = strings.toArray(arr);
StringBuffer sb = new StringBuffer();
sb.append("[");
for(int i=0; i<arr.length; i++){
if(i+1 < arr.length){
sb.append(",");
}
}
sb.append("]");
return sb.toString();
}
}
}
,但是這給了我
JavaScriptArray is [,,]
控制檯上
,我犯了些什麼錯誤?在線工作代碼爲http://rextester.com/NDUGT61105
一切都是正確的..除了實際上在'toJavascriptArray(名單 listSeats)'方法......你不是活得在那裏添加字符串...只是一個逗號 –
3kings
因此,在那裏添加...'sb.append(arr [i]);' – 3kings