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NumberUtils.java
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NumberUtils.java
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package com.blankj.utilcode.util;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.text.NumberFormat;
/**
* <pre>
* author: blankj
* blog : http://blankj.com
* time : 2020/04/12
* desc : utils about number
* </pre>
*/
public final class NumberUtils {
private static final ThreadLocal<DecimalFormat> DF_THREAD_LOCAL = new ThreadLocal<DecimalFormat>() {
@Override
protected DecimalFormat initialValue() {
return (DecimalFormat) NumberFormat.getInstance();
}
};
public static DecimalFormat getSafeDecimalFormat() {
return DF_THREAD_LOCAL.get();
}
private NumberUtils() {
throw new UnsupportedOperationException("u can't instantiate me...");
}
/**
* Format the value.
*
* @param value The value.
* @param fractionDigits The number of digits allowed in the fraction portion of value.
* @return the format value
*/
public static String format(float value, int fractionDigits) {
return format(value, false, 1, fractionDigits, true);
}
/**
* Format the value.
*
* @param value The value.
* @param fractionDigits The number of digits allowed in the fraction portion of value.
* @param isHalfUp True to rounded towards the nearest neighbor.
* @return the format value
*/
public static String format(float value, int fractionDigits, boolean isHalfUp) {
return format(value, false, 1, fractionDigits, isHalfUp);
}
/**
* Format the value.
*
* @param value The value.
* @param minIntegerDigits The minimum number of digits allowed in the integer portion of value.
* @param fractionDigits The number of digits allowed in the fraction portion of value.
* @param isHalfUp True to rounded towards the nearest neighbor.
* @return the format value
*/
public static String format(float value, int minIntegerDigits, int fractionDigits, boolean isHalfUp) {
return format(value, false, minIntegerDigits, fractionDigits, isHalfUp);
}
/**
* Format the value.
*
* @param value The value.
* @param isGrouping True to set grouping will be used in this format, false otherwise.
* @param fractionDigits The number of digits allowed in the fraction portion of value.
* @return the format value
*/
public static String format(float value, boolean isGrouping, int fractionDigits) {
return format(value, isGrouping, 1, fractionDigits, true);
}
/**
* Format the value.
*
* @param value The value.
* @param isGrouping True to set grouping will be used in this format, false otherwise.
* @param fractionDigits The number of digits allowed in the fraction portion of value.
* @param isHalfUp True to rounded towards the nearest neighbor.
* @return the format value
*/
public static String format(float value, boolean isGrouping, int fractionDigits, boolean isHalfUp) {
return format(value, isGrouping, 1, fractionDigits, isHalfUp);
}
/**
* Format the value.
*
* @param value The value.
* @param isGrouping True to set grouping will be used in this format, false otherwise.
* @param minIntegerDigits The minimum number of digits allowed in the integer portion of value.
* @param fractionDigits The number of digits allowed in the fraction portion of value.
* @param isHalfUp True to rounded towards the nearest neighbor.
* @return the format value
*/
public static String format(float value, boolean isGrouping, int minIntegerDigits, int fractionDigits, boolean isHalfUp) {
return format(float2Double(value), isGrouping, minIntegerDigits, fractionDigits, isHalfUp);
}
/**
* Format the value.
*
* @param value The value.
* @param fractionDigits The number of digits allowed in the fraction portion of value.
* @return the format value
*/
public static String format(double value, int fractionDigits) {
return format(value, false, 1, fractionDigits, true);
}
/**
* Format the value.
*
* @param value The value.
* @param fractionDigits The number of digits allowed in the fraction portion of value.
* @param isHalfUp True to rounded towards the nearest neighbor.
* @return the format value
*/
public static String format(double value, int fractionDigits, boolean isHalfUp) {
return format(value, false, 1, fractionDigits, isHalfUp);
}
/**
* Format the value.
*
* @param value The value.
* @param minIntegerDigits The minimum number of digits allowed in the integer portion of value.
* @param fractionDigits The number of digits allowed in the fraction portion of value.
* @param isHalfUp True to rounded towards the nearest neighbor.
* @return the format value
*/
public static String format(double value, int minIntegerDigits, int fractionDigits, boolean isHalfUp) {
return format(value, false, minIntegerDigits, fractionDigits, isHalfUp);
}
/**
* Format the value.
*
* @param value The value.
* @param isGrouping True to set grouping will be used in this format, false otherwise.
* @param fractionDigits The number of digits allowed in the fraction portion of value.
* @return the format value
*/
public static String format(double value, boolean isGrouping, int fractionDigits) {
return format(value, isGrouping, 1, fractionDigits, true);
}
/**
* Format the value.
*
* @param value The value.
* @param isGrouping True to set grouping will be used in this format, false otherwise.
* @param fractionDigits The number of digits allowed in the fraction portion of value.
* @param isHalfUp True to rounded towards the nearest neighbor.
* @return the format value
*/
public static String format(double value, boolean isGrouping, int fractionDigits, boolean isHalfUp) {
return format(value, isGrouping, 1, fractionDigits, isHalfUp);
}
/**
* Format the value.
*
* @param value The value.
* @param isGrouping True to set grouping will be used in this format, false otherwise.
* @param minIntegerDigits The minimum number of digits allowed in the integer portion of value.
* @param fractionDigits The number of digits allowed in the fraction portion of value.
* @param isHalfUp True to rounded towards the nearest neighbor.
* @return the format value
*/
public static String format(double value, boolean isGrouping, int minIntegerDigits, int fractionDigits, boolean isHalfUp) {
DecimalFormat nf = getSafeDecimalFormat();
nf.setGroupingUsed(isGrouping);
nf.setRoundingMode(isHalfUp ? RoundingMode.HALF_UP : RoundingMode.DOWN);
nf.setMinimumIntegerDigits(minIntegerDigits);
nf.setMinimumFractionDigits(fractionDigits);
nf.setMaximumFractionDigits(fractionDigits);
return nf.format(value);
}
/**
* Float to double.
*
* @param value The value.
* @return the number of double
*/
public static double float2Double(float value) {
return new BigDecimal(String.valueOf(value)).doubleValue();
}
}