In Java, generate 10 groups randomly six-figure authentication code (case-sensitive alphanumeric combination) run results, as seen here thank you

CodePudding user response:

For example

 
Import the Java. Util. HashSet; 
Import the Java. Util. Random; 
Import the Java. Util. Set; 
Public class Sample {
Public static void main (String [] args) {
Char [] keys="0123456789 abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz". ToCharArray (); 
The Random ran=new Random (); 
Set The set=new HashSet<> (a); 
The StringBuilder buf=new StringBuilder (); 
While (set. The size () & lt; 10) {
Buf. Delete (0, buf. Length ()); 
for (int i=0; I & lt; 6; I++) {
Buf. Append (keys [ran nextInt (keys) length)]); 
} 
String s=buf. ToString (); 
if (! The set contains (s)) {
Set. The add (s); 
} 
} 
For (String s: set) {
System. The out. Printf (" random authentication code: % s \ n ", s); 
} 
} 
}