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Java Program to Create random strings
In this article, we will understand how to create random strings. String is a datatype that contains one or more characters and is enclosed in double quotes(“ ”).
Below is a demonstration of the same −
Suppose our input is −
The size of the string is defined as: 10
The desired output would be −
Random string: ink1n1dodv
Algorithm
Step 1 - START Step 2 - Declare an integer namely string_size, a string namely alpha_numeric and an object of StringBuilder namely string_builder. Step 3 - Define the values. Step 4 - Iterate for 10 times usinf a for-loop, generate a random value using the function Math.random() and append the value using append() function. Step 5 - Display the result Step 6 - Stop
Example 1
Here, we bind all the operations together under the ‘main’ function.
public class RandomString {
public static void main(String[] args) {
int string_size = 10;
System.out.println("The size of the string is defined as: " +string_size);
String alpha_numeric = "0123456789" + "abcdefghijklmnopqrstuvxyz";
StringBuilder string_builder = new StringBuilder(string_size);
for (int i = 0; i < string_size; i++) {
int index = (int)(alpha_numeric.length() * Math.random());
string_builder.append(alpha_numeric.charAt(index));
}
String result = string_builder.toString();
System.out.println("The random string generated is: " +result);
}
}Output
The size of the string is defined as: 10 The random string generated is: ink1n1dodv
Example 2
Here, we encapsulate the operations into functions exhibiting object-oriented programming.
public class RandomString {
static String getAlphaNumericString(int string_size) {
String alpha_numeric = "0123456789" + "abcdefghijklmnopqrstuvxyz";
StringBuilder string_builder = new StringBuilder(string_size);
for (int i = 0; i < string_size; i++) {
int index = (int)(alpha_numeric.length() * Math.random());
string_builder.append(alpha_numeric.charAt(index));
}
return string_builder.toString();
}
public static void main(String[] args) {
int string_size = 10;
System.out.println("The size of the string is defined as: " +string_size);
System.out.println("The random string generated is: ");
System.out.println(RandomString.getAlphaNumericString(string_size));
}
}Output
The size of the string is defined as: 10 The random string generated is: ink1n1dodv
Updated on: 29-Mar-2022
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