randomexam.java

java学习课件

/*产生100个不重复的随机数*/
import java.util.*;
class RandomExam
{
 public static void main(String [] args)
 {
  Random r1=new Random();
  Vector v1=new Vector();
  for(int i=1; i<=100;i++)
  {
  	int n=r1.nextInt(100)+1;
  	while(v1.contains(""+n)) n=r1.nextInt(100)+1;
  	v1.add(""+n);
  	System.out.print(n+"  ");
  	if(i%5==0) System.out.println();
  }	
 }
}