org.macrocloud.kernel.toolkit.utils.NumberUtil Maven / Gradle / Ivy
package org.macrocloud.kernel.toolkit.utils;
import org.springframework.lang.Nullable;
/**
* 数字类型工具类.
*
* @author macro
*/
public class NumberUtil extends org.springframework.util.NumberUtils {
//-----------------------------------------------------------------------
/**
* Convert a String to an int, returning
* zero if the conversion fails.
*
* If the string is null, zero is returned.
*
*
* NumberUtil.toInt(null) = 0
* NumberUtil.toInt("") = 0
* NumberUtil.toInt("1") = 1
*
*
* @param str the string to convert, may be null
* @return the int represented by the string, or zero if
* conversion fails
*/
public static int toInt(final String str) {
return toInt(str, -1);
}
/**
* Convert a String to an int, returning a
* default value if the conversion fails.
*
* If the string is null, the default value is returned.
*
*
* NumberUtil.toInt(null, 1) = 1
* NumberUtil.toInt("", 1) = 1
* NumberUtil.toInt("1", 0) = 1
*
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the int represented by the string, or the default if conversion fails
*/
public static int toInt(@Nullable final String str, final int defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return Integer.valueOf(str);
} catch (final NumberFormatException nfe) {
return defaultValue;
}
}
/**
* Convert a String to a long, returning
* zero if the conversion fails.
*
* If the string is null, zero is returned.
*
*
* NumberUtil.toLong(null) = 0L
* NumberUtil.toLong("") = 0L
* NumberUtil.toLong("1") = 1L
*
*
* @param str the string to convert, may be null
* @return the long represented by the string, or 0 if
* conversion fails
*/
public static long toLong(final String str) {
return toLong(str, 0L);
}
/**
* Convert a String to a long, returning a
* default value if the conversion fails.
*
* If the string is null, the default value is returned.
*
*
* NumberUtil.toLong(null, 1L) = 1L
* NumberUtil.toLong("", 1L) = 1L
* NumberUtil.toLong("1", 0L) = 1L
*
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the long represented by the string, or the default if conversion fails
*/
public static long toLong(@Nullable final String str, final long defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return Long.valueOf(str);
} catch (final NumberFormatException nfe) {
return defaultValue;
}
}
/**
* Convert a String to a Double.
*
* @param value value
* @return double value
*/
public static Double toDouble(String value) {
return toDouble(value, null);
}
/**
*
Convert a String to a Double.
*
* @param value value
* @param defaultValue 默认值
* @return double value
*/
public static Double toDouble(@Nullable String value, Double defaultValue) {
if (value != null) {
return Double.valueOf(value.trim());
}
return defaultValue;
}
/**
*
Convert a String to a Double.
*
* @param value value
* @return double value
*/
public static Float toFloat(String value) {
return toFloat(value, null);
}
/**
*
Convert a String to a Double.
*
* @param value value
* @param defaultValue 默认值
* @return double value
*/
public static Float toFloat(@Nullable String value, Float defaultValue) {
if (value != null) {
return Float.valueOf(value.trim());
}
return defaultValue;
}
/** All possible chars for representing a number as a String. */
private final static char[] DIGITS = {
'0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'a', 'b',
'c', 'd', 'e', 'f', 'g', 'h',
'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't',
'u', 'v', 'w', 'x', 'y', 'z',
'A', 'B', 'C', 'D', 'E', 'F',
'G', 'H', 'I', 'J', 'K', 'L',
'M', 'N', 'O', 'P', 'Q', 'R',
'S', 'T', 'U', 'V', 'W', 'X',
'Y', 'Z'
};
/**
* 将 long 转短字符串 为 62 进制.
*
* @param i 数字
* @return 短字符串
*/
public static String to62String(long i) {
int radix = DIGITS.length;
char[] buf = new char[65];
int charPos = 64;
i = -i;
while (i <= -radix) {
buf[charPos--] = DIGITS[(int) (-(i % radix))];
i = i / radix;
}
buf[charPos] = DIGITS[(int) (-i)];
return new String(buf, charPos, (65 - charPos));
}
}