Java Long Number Create toLong(Object number)

Description

to Long

License

Open Source License

Declaration

public static long toLong(Object number) 

Method Source Code

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

public class Main {
    public static long toLong(Object number) {
        if (number == null) {
            return 0L;
        } else if (number instanceof Number) {
            return ((Number) number).longValue();
        } else if (number instanceof String) {
            String str = (String) number;
            int isNumber = isNumeric(str);
            return isNumber == 1 ? Long.parseLong(str) : (isNumber == 2 ? Double.valueOf(str).longValue() : 0L);
        } else {//www  .  jav  a 2 s  .c  o m
            return 0L;
        }
    }

    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. toLong(Object _value, long _default)
2. toLong(Object cell)
3. toLong(Object expectInt)
4. toLong(Object num)
5. toLong(Object num, long defValue)
6. toLong(Object o)
7. toLong(Object o)
8. toLong(Object o)
9. toLong(Object ob, Long defaultLong)