如何将字符串转换为double ..请帮助 [英] How to convert string to double ..please help
问题描述
如何将字符串转换为双倍？
我有一个双变量dTot;
它的值是5.037717235E7
当我做FreemarkerTools.formatDecimal（dTot）时，我把它作为字符串50377172.35。
现在我想将它作为double值传递给方法格式（），这是如下所示。
当我做Double.parseDouble我得到dTot为5.037717235E7
CurrencyConverter.format（Double.parseDouble（Freema rkerTools.formatDecimal（dTot）））;
>
公共类CurrencyConverter {
public static String format（double n）{
if（n< 0）
return"（" + formatAcc（Math.abs（n））+"）" ;;
返回formatAcc（n）;
}
public static String formatAcc（double n）{
// long decPart = 0;
String s1 ="" + n;
String [] nums = s1.split（" \\。"）;
long decPart = Integer.parseInt（nums [1]）; < br $>
//长decPart =（长）（（n-Math.floor（n））* 100）;
if（n == 0）
return" 0.00";
int arr [] = new int [] {1000， 100,100,100,100,100};
String arrFromat [] = new String [] {" 000"，" 00"，" 00"，" 00"，" ; 00"，
" 00" };
String s ="" ;;
for（int i = 0; i< arr.length; i ++）{
long x =（long）（n％arr [i]）;
if（s.length（）> 0）
s ="，" + s;
n = n / arr [i];
if（n< 1）{
s = x + s;
休息;
}其他{
s =格式（x，arrFromat [i]）+ s;
}
}
返回s +"。" + format（decPart，" 00"）;
}
私有静态字符串格式（长n，字符串格式）{
字符串temp = n +"" ;;
temp = format.substring（temp.length（））+ temp;
返回temp;
}
public static void main（String [] args）{
System.out.println（CurrencyConverter.format（554406 000.40））;
}
}
How to convert string to double?
Ive got a double variable dTot;
its value is 5.037717235E7
when i did FreemarkerTools.formatDecimal(dTot) i got it as string "50377172.35".
now i want to pass it as a double value to the method format() which is shown below.
when i do Double.parseDouble i get dTot as 5.037717235E7
CurrencyConverter.format(Double.parseDouble(Freema rkerTools.formatDecimal(dTot)));
what else can i do to pass it as 50377172.35 to the method format()
public class CurrencyConverter {
public static String format(double n) {
if(n<0)
return "("+formatAcc(Math.abs(n))+")";
return formatAcc(n);
}
public static String formatAcc(double n){
//long decPart=0;
String s1 = ""+n;
String[] nums = s1.split("\\.");
long decPart = Integer.parseInt(nums[1]);
// long decPart = (long) ((n-Math.floor(n))*100);
if(n==0)
return "0.00";
int arr[] = new int[] { 1000, 100, 100, 100, 100, 100 };
String arrFromat[] = new String[] { "000", "00", "00", "00", "00",
"00" };
String s = "";
for (int i = 0; i < arr.length; i++) {
long x = (long) (n % arr[i]);
if (s.length() > 0)
s = "," + s;
n = n / arr[i];
if (n < 1) {
s = x + s;
break;
} else {
s = format(x, arrFromat[i]) + s;
}
}
return s+"."+format(decPart,"00");
}
private static String format(long n, String format) {
String temp = n + "";
temp = format.substring(temp.length()) + temp;
return temp;
}
public static void main(String[] args) {
System.out.println(CurrencyConverter.format(554406 000.40));
}
}
推荐答案
如何将字符串转换为双倍？
我有一个双变量dTot;
它的值是5.037717235E7
当我做了FreemarkerTools.formatDecimal（dTot）我得到它作为字符串" 503 77172.35"
现在我想将它作为double值传递给方法格式（），如下所示。
当我做Double时。 parseDouble我得到dTot为5.037717235E7
CurrencyConverter.format（Double.parseDouble（Freema rkerTools.formatDecimal（dTot）））;
我还能做些什么将它作为50377172.35传递给方法格式（）
>
公共类CurrencyConverter {
public static String format（double n）{
if（n< 0）
return"（" + formatAcc（Math.abs（n））+"）" ;;
返回formatAcc（n）;
}
public static String formatAcc（double n）{
// long decPart = 0;
String s1 ="" + n;
String [] nums = s1.split（" \\。"）;
long decPart = Integer.parseInt（nums [1]）; < br $>
//长decPart =（长）（（n-Math.floor（n））* 100）;
if（n == 0）
return" 0.00";
int arr [] = new int [] {1000， 100,100,100,100,100};
String arrFromat [] = new String [] {" 000"，" 00"，" 00"，" 00"，" ; 00"，
" 00" };
String s ="" ;;
for（int i = 0; i< arr.length; i ++）{
long x =（long）（n％arr [i]）;
if（s.length（）> 0）
s ="，" + s;
n = n / arr [i];
if（n< 1）{
s = x + s;
休息;
}其他{
s =格式（x，arrFromat [i]）+ s;
}
}
返回s +"。" + format（decPart，" 00"）;
}
私有静态字符串格式（长n，字符串格式）{
字符串temp = n +"" ;;
temp = format.substring（temp.length（））+ temp;
返回temp;
}
public static void main（String [] args）{
System.out.println（CurrencyConverter.format（554406 000.40））;
}
}
How to convert string to double?
Ive got a double variable dTot;
its value is 5.037717235E7
when i did FreemarkerTools.formatDecimal(dTot) i got it as string "50377172.35".
now i want to pass it as a double value to the method format() which is shown below.
when i do Double.parseDouble i get dTot as 5.037717235E7
CurrencyConverter.format(Double.parseDouble(Freema rkerTools.formatDecimal(dTot)));
what else can i do to pass it as 50377172.35 to the method format()
public class CurrencyConverter {
public static String format(double n) {
if(n<0)
return "("+formatAcc(Math.abs(n))+")";
return formatAcc(n);
}
public static String formatAcc(double n){
//long decPart=0;
String s1 = ""+n;
String[] nums = s1.split("\\.");
long decPart = Integer.parseInt(nums[1]);
// long decPart = (long) ((n-Math.floor(n))*100);
if(n==0)
return "0.00";
int arr[] = new int[] { 1000, 100, 100, 100, 100, 100 };
String arrFromat[] = new String[] { "000", "00", "00", "00", "00",
"00" };
String s = "";
for (int i = 0; i < arr.length; i++) {
long x = (long) (n % arr[i]);
if (s.length() > 0)
s = "," + s;
n = n / arr[i];
if (n < 1) {
s = x + s;
break;
} else {
s = format(x, arrFromat[i]) + s;
}
}
return s+"."+format(decPart,"00");
}
private static String format(long n, String format) {
String temp = n + "";
temp = format.substring(temp.length()) + temp;
return temp;
}
public static void main(String[] args) {
System.out.println(CurrencyConverter.format(554406 000.40));
}
}
就像我之前已经指出的那样，改变你的方法
Like I already pointed out before, change your method
就像我之前已经指出的那样，改变你的方法
Like I already pointed out before, change your method
但我在格式（）内部进行了大量的计算。
我如何用字符串进行计算？
请给出代码
But im doing a lot of calculations withg that double value inside format().
How do i do the calculations with string?
Please c the code given
在格式方法中你可以转换使用parseDouble返回你的double，这样你现在可以将你的值作为字符串和该方法中的double使用
Inside the format method you can then convert back to your double using parseDouble so that you now have your value both as a string and as a double inside that method
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