Java Decimal Format randomDouble(double minDouble, double maxDouble)

Description

random Double

License

Apache License

Declaration

public static double randomDouble(double minDouble, double maxDouble) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.text.DecimalFormat;

import java.util.Random;

public class Main {
    private static final ThreadLocal<Random> localRandom = new ThreadLocal<Random>() {
        @Override/*from   w  w  w .java2  s  . c  o  m*/
        protected Random initialValue() {
            return new Random();
        }
    };

    public static double randomDouble(double minDouble, double maxDouble) {
        return minDouble == maxDouble ? minDouble
                : randomInt((int) getCorrectionValue(minDouble * 100000, 0),
                        (int) getCorrectionValue(maxDouble * 100000, 0)) / 100000.0;
    }

    public static double randomDouble() {
        return localRandom.get().nextDouble();
    }

    public static int randomInt(int minInt, int maxInt) {
        return minInt == maxInt ? minInt
                : (Math.min(minInt, maxInt) + localRandom.get().nextInt(Math.abs(maxInt - minInt) + 1));
    }

    public static double getCorrectionValue(double basicValue, int digit) {
        if (digit < 0)
            return basicValue;
        StringBuilder sb = new StringBuilder("#");
        if (digit > 0) {
            sb.append("0.");
            for (int i = 0; i < digit; i++) {
                sb.append("0");
            }
        }
        DecimalFormat format = new DecimalFormat(sb.toString());
        return Double.parseDouble(format.format(basicValue));
    }

    public static Number min(Number... numbers) {
        Number min = Double.MAX_VALUE;
        for (Number number : numbers) {
            if (number.doubleValue() < min.doubleValue()) {
                min = number;
            }
        }
        return min;
    }

    public static int nextInt() {
        return localRandom.get().nextInt();
    }

    public static int nextInt(int n) {
        return localRandom.get().nextInt(n);
    }
}

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