Revisions to How to generate a random alpha-numeric string

Used more standard formatting.

edited Nov 12, 2020 at 16:57

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static final String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; static SecureRandom rnd = new SecureRandom(); String randomString( int len ){ StringBuilder sb = new StringBuilder( len ); for( int i = 0; i < len; i++ )  sb.append( AB.charAt( rnd.nextInt(AB.length()) ) ); return sb.toString(); }

static final String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; static SecureRandom rnd = new SecureRandom(); String randomString( int len ){ StringBuilder sb = new StringBuilder( len ); for( int i = 0; i < len; i++ )  sb.append( AB.charAt( rnd.nextInt(AB.length()) ) ); return sb.toString(); }

static final String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; static SecureRandom rnd = new SecureRandom(); String randomString(int len){ StringBuilder sb = new StringBuilder(len); for(int i = 0; i < len; i++) sb.append(AB.charAt(rnd.nextInt(AB.length()))); return sb.toString(); }

Added SecureRandom as per comment

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edited Feb 25, 2016 at 10:41

Anirudh

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static final String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; static RandomSecureRandom rnd = new RandomSecureRandom(); String randomString( int len ){ StringBuilder sb = new StringBuilder( len ); for( int i = 0; i < len; i++ ) sb.append( AB.charAt( rnd.nextInt(AB.length()) ) ); return sb.toString(); }

static final String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; static Random rnd = new Random(); String randomString( int len ){ StringBuilder sb = new StringBuilder( len ); for( int i = 0; i < len; i++ ) sb.append( AB.charAt( rnd.nextInt(AB.length()) ) ); return sb.toString(); }

static final String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; static SecureRandom rnd = new SecureRandom(); String randomString( int len ){ StringBuilder sb = new StringBuilder( len ); for( int i = 0; i < len; i++ ) sb.append( AB.charAt( rnd.nextInt(AB.length()) ) ); return sb.toString(); }

Added lowercase charcters as per comment

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edit approved Feb 11, 2016 at 9:28

Eldeeb

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static final String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; static Random rnd = new Random(); String randomString( int len ){ StringBuilder sb = new StringBuilder( len ); for( int i = 0; i < len; i++ ) sb.append( AB.charAt( rnd.nextInt(AB.length()) ) ); return sb.toString(); }

static final String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; static Random rnd = new Random(); String randomString( int len ){ StringBuilder sb = new StringBuilder( len ); for( int i = 0; i < len; i++ ) sb.append( AB.charAt( rnd.nextInt(AB.length()) ) ); return sb.toString(); }

static final String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; static Random rnd = new Random(); String randomString( int len ){ StringBuilder sb = new StringBuilder( len ); for( int i = 0; i < len; i++ ) sb.append( AB.charAt( rnd.nextInt(AB.length()) ) ); return sb.toString(); }