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Java Program to generate random numbers string
At first, create a character array −
static char num[] = { '0', '1', '2', '3', '4', '5' };Now, let’s say you want to a string with length. Create a StringBuilder and use append() to create random numbers string out of it −
int len = 5;
StringBuilder strBuilder = new StringBuilder();
for (int i = 0; i < len; i++) {
strBuilder.append(randomNum());
}Above, we created a randomNum() function that returns the random numbers string −
public static char randomNum() {
return num[(int) Math.floor(Math.random() * 5)];
}Example
public class Demo {
static char num[] = { '0', '1', '2', '3', '4', '5' };
public static char randomNum() {
return num[(int) Math.floor(Math.random() * 5)];
}
public static void main(String[] args) {
int len = 5;
StringBuilder strBuilder = new StringBuilder();
for (int i = 0; i < len; i++) {
strBuilder.append(randomNum());
}
System.out.println("Random numbers string = "+strBuilder.toString());
}
}Output
Random numbers string = 23024
Updated on: 30-Jul-2019
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