随机数

我就是我 2022-08-27 12:40 191阅读 0赞

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();  
    \}  
\}