Java随机数的例子
该例子演示了随机数的产生，可通过设置最低数（minNum）和最高数(maxNum)以控制随机数的产生范围。
程序当前最低数固定为0，将从控制台上接收输入的数字作为最高数。
例子相对简单，仅供初学者参考。
import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.util.Random;public class GRandom {/** * @author Jaenson * @since 03/17/2011 */private int minNum=0;private int maxNum=0;private static InputStreamReader in; private static BufferedReader reader; public GRandom(){in = new InputStreamReader(System.in); reader = new BufferedReader(in); }public String GenerateRandomNum(int tarMinNum, int tarMaxNum){String result="";Random random = new Random();/* Set Random Seed Long longNum = System.currentTimeMillis();random.setSeed(longNum);*//* Boolean String.valueOf(random.nextBoolean());*//* Double String.valueOf(random.nextDouble());*//* FloatString.valueOf(random.nextFloat());*//* Long String.valueOf(random.nextLong());*//* Gaussian Algorithm String.valueOf(random.nextGaussian());*//* Integer */int n = tarMaxNum - tarMinNum + 1;int i = random.nextInt(tarMaxNum) % n;result = String.valueOf(tarMinNum + i);return result;}public String readString() throws Exception{String s = ""; char temp;try{ s = reader.readLine(); }catch(IOException e){System.out.println("Input error! Please restart the application.");temp = (char) System.in.read();System.exit(0); }catch(Exception e){System.out.println("Input error! Please restart the application.");temp = (char) System.in.read();System.exit(0); }return s; } public int printConsoleChar() throws IllegalArgumentException, Exception{int random = 0;char temp='a';try{minNum = 0;System.out.print("Enter the number(Integer):"); maxNum = Integer.parseInt(readString()); /* Generate 100 times */for(int i=0; i<100; i++){random = Integer.parseInt(GenerateRandomNum(minNum, maxNum));System.out.println("Random Number:"+random);}}catch(IOException e){System.out.println("Input error! Please restart the application.");temp = (char) System.in.read();System.exit(0);}catch(IllegalArgumentException e){System.out.println("Illegal number! Please restart the application.");temp = (char) System.in.read();System.exit(0);}catch(Exception e){System.out.println("Input error! Please restart the application.");temp = (char) System.in.read();System.exit(0);}return random;}public static void main(String[] args) throws Exception{// TODO Auto-generated method stubGRandom GR= new GRandom();GR.printConsoleChar();}}