java入门级编程训练，完整代码

1、importjava.util.Random;publicclassHello{publicstaticvoidmain(String []args){/* double r=Math.random();System.out.println(r);*/inti;Random r=newRandom();i=r.nextInt(8);System.out.println(i);}

3、 public static void main(String []args){ int i; Random r=new Random(); i=r.nextInt(8); System.out.println(i); }

5、 for(intk=1;k<=2*i-1;k++){ System.out.print("*"); } System.out.println();}}}