Java Double Number Create toDouble(Object number)

Description

to Double

License

Open Source License

Declaration

public static double toDouble(Object number) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    public static double toDouble(Object number) {
        if (number == null) {
            return 0.0D;
        } else if (number instanceof Number) {
            return ((Number) number).doubleValue();
        } else if (number instanceof String) {
            String str = (String) number;
            return isNumeric(str) > 0 ? Double.valueOf(str) : 0.0D;
        } else {/*from  w  w  w  .  j  av a  2s .co  m*/
            return 0.0D;
        }
    }

    public static int isNumeric(String str) {
        if (str == null) {
            return 0;
        } else {
            boolean isdouble = false;
            boolean hasE = false;
            int i = str.length();

            while (true) {
                while (true) {
                    char c;
                    do {
                        --i;
                        if (i < 0) {
                            if (isdouble) {
                                return 2;
                            }

                            return 1;
                        }

                        c = str.charAt(i);
                    } while (i == 0 && c == 45);

                    if (c == 46) {
                        if (isdouble) {
                            return 0;
                        }

                        isdouble = true;
                    } else if (c != 69 && c != 101) {
                        if (!Character.isDigit(str.charAt(i))) {
                            return 0;
                        }
                    } else {
                        if (hasE) {
                            return 0;
                        }

                        hasE = true;
                    }
                }
            }
        }
    }
}

Related

1. toDouble(Number value)
2. toDouble(Object _inStrObj)
3. toDouble(Object _value, double _default)
4. toDouble(Object argSource)
5. toDouble(Object literal)
6. toDouble(Object number)
7. toDouble(Object o)
8. toDouble(Object o)
9. toDouble(Object o)