/*
* @author talent_marquis
* Email: talent_marquis@163.com
* Copyright (C) 2007 talent_marquis
* All rights reserved.
*/
package com.dextrys.trilogy.util;
import java.util.Arrays;
import org.eclipse.swt.graphics.RGB;
public class RandomUtil
{
/**
* @param args
*/
public static void main( String[] args )
{
//System.out.println( getRandomNormalString( 8 ) );
int[] test = getRandomIntWithoutReduplicate( 0, 40, 39 );
Arrays.sort( test );
for( int i : test )
{
System.out.println( i );
}
}
/**
* get a integer array filled with random integer without reduplicate [min, max)
* @param min the minimum value
* @param max the maximum value
* @param size the capacity of the array
* @return a integer array filled with random integer without redupulicate
*/
public static int[] getRandomIntWithoutReduplicate( int min, int max, int size )
{
int[] result = new int[size];
int arraySize = max - min;
int[] intArray = new int[arraySize];
// init intArray
for( int i = 0 ; i < intArray.length ; i++ )
{
intArray[i] = i + min;
}
// get randome interger without reduplicate
for( int i = 0 ; i < size ; i++ )
{
int c = getRandomInt( min, max - i );
int index = c - min;
swap( intArray, index, arraySize - 1 - i );
result[i] = intArray[ arraySize - 1 - i ];
}
return result;
}
private static void swap( int[] array, int x, int y )
{
int temp = array[x];
array[x] = array[y];
array[y] = temp;
}
/**
* get a random Integer with the range [min, max)
* @param min the minimum value
* @param max the maximum value
* @return the random Integer value
*/
public static int getRandomInt( int min, int max )
{
// include min, exclude max
int result = min + new Double( Math.random() * ( max - min ) ).intValue();
return result;
}
/**
* get a random double with the range [min, max)
* @param min the minimum value
* @param max the maximum value
* @return the random double value
*/
public static double getRandomDouble( double min, double max )
{
// include min, exclude max
double result = min + ( Math.random() * ( max - min ) );
return result;
}
/**
*
* @return a random char with the range ASCII 33(!) to ASCII 126(~)
*/
public static char getRandomChar()
{
// from ASCII code 33 to ASCII code 126
int firstChar = 33; // "!"
int lastChar = 126; // "~"
char result = ( char ) ( getRandomInt( firstChar, lastChar + 1 ) );
return result;
}
/**
*
* @return a random rgb color
*/
public static RGB getRandomRGB()
{
int red = getRandomInt(0,256);
int green = getRandomInt(0,256);
int blue = getRandomInt(0,256);
return new RGB( red, green, blue );
}
/**
*
* @return a random char with the range [0-9],[a-z],[A-Z]
*/
public static char getRandomNormalChar()
{
// include 0-9,a-z,A-Z
int number = getRandomInt( 0, 62 );
int zeroChar = 48;
int nineChar = 57;
int aChar = 97;
int zChar = 122;
int AChar = 65;
int ZChar = 90;
char result;
if( number < 10 )
{
result = ( char ) ( getRandomInt( zeroChar, nineChar + 1 ) );
return result;
}
else if( number >= 10 && number < 36 )
{
result = ( char ) ( getRandomInt( AChar, ZChar + 1 ) );
return result;
}
else if( number >= 36 && number < 62 )
{
result = ( char ) ( getRandomInt( aChar, zChar + 1 ) );
return result;
}
else
{
return 0;
}
}
/**
*
* @param length the length of the String
* @return a String filled with random char
*/
public static String getRandomString( int length )
{
// include ASCII code from 33 to 126
StringBuffer result = new StringBuffer();
for( int i = 0; i < length; i++ )
{
result.append( getRandomChar() );
}
return result.toString();
}
/**
*
* @param length the length of the String
* @return a String filled with normal random char
*/
public static String getRandomNormalString( int length )
{
// include 0-9,a-z,A-Z
StringBuffer result = new StringBuffer();
for( int i = 0; i < length; i++)
{
result.append( getRandomNormalChar() );
}
return result.toString();
}
}
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