JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Basic random number generator.


Description:

Many times we need to generate sequence of numbers. It is not a problem to generate sequence of numbers. But some times we need to generate random numbers. In java we can generate random numbers by using Random class. By using Random class, we can generate random integers, long numbers and double values. Below example shows how to generate random numbers using Random class.


Code:
package com.java2novice.random;

import java.util.Random;

public class MyBasicRandom {

	public static void main(String a[]){
		Random rand = new Random();
		System.out.println("Random Integers:");
		System.out.println(rand.nextInt());
		System.out.println(rand.nextInt());
		System.out.println(rand.nextInt());
		System.out.println("Random Double Numbers:");
		System.out.println(rand.nextDouble());
		System.out.println(rand.nextDouble());
		System.out.println(rand.nextDouble());
		System.out.println("Random Long Numbers:");
		System.out.println(rand.nextLong());
		System.out.println(rand.nextLong());
		System.out.println(rand.nextLong());
	}
}

Output:
Random Integers:
1400247241
953993278
830962592
Random Double Numbers:
0.19841760470907022
0.32964328277263866
0.4624594748136943
Random Long Numbers:
4925512194471935414
2115815340178756456
4896741386551752249
Next Program >>

List of Random class sample programs:

  1. Basic random number generator.
  2. How to generate random numbers in the given range?
  3. How to generate same random sequence everytime?
  4. How to change Random class seed value?
  5. How to create random string with random characters?
Knowledge Centre
ServletOuptputStream Vs PrintWriter
ServletOutputStream: ServletResponse.getOutputStream() returns a ServletOutputStream suitable for writing binary data in the response. The servlet container does not encode the binary data, it sends the raw data as it is.

PrintWriter: ServletResponse.getWriter() returns PrintWriter object which sends character text to the client. The PrintWriter uses the character encoding returned by getCharacterEncoding(). If the response's character encoding has not been specified then it does default character encoding.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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