java冒泡，字符串输出平均值

java编写冒泡算法，还有求数组平均值，然后用字符串的形式输出。

 

public class variable {

	/**
	 * @param args
	 */
	public static  void main(String[] args) {
		int a[]={1,9,5,8,7,4,3};
		int count=a.length;
		String b= new String();
		fun ling =new fun();
		
		b =ling. avg(a);
		//System.out.println("b = "+ b+"\n" );
		//System.out.printf("avg1 =%5s\n", b);
		System.out.println (b );
		ling.bubble(a);
		System.out.println("调用后冒泡排序：");
		  System.out.printf("[");
		  for (int k=0;k<count;k++)
		  {
			  System.out.printf(a[k]+" ");
		  }
		  System.out.printf("]");
      
	}
	
}
 class fun
{
	public  String avg(int a[])
	{
		int sum =0;
		Double avge =0.0;
		int i=0;
		int count =a.length;
		String avge1 =new String();
		//System.out.printf("count =%d \n",count);
		for( i=0;i<count;++i)
		{
			sum += a[i];
		}
		avge = sum / (count*1.0);
		//System.out.printf("sum = "+ sum+"\n" );
		System.out.printf("avg =%.3f\n", avge );
		//avge1=avge.toString();
		avge1=String.format("%.3f", avge);
               //字符串输出格式，三位小数点
		//avge1 = avge + "";
		return avge1;
	}
  public  void bubble (int a[])
  {
	  int count =a.length;
	  int temp=0;
	  System.out.println("冒泡排序前：");
	  System.out.printf("[");
	  for (int k=0;k<count;k++)
	  {
		  System.out.printf(a[k]+" ");
	  }
	  System.out.printf("]");
	  System.out.printf("\n");
	  for(int i=0; i<count;i++)
		  for(int j=i+1;j<count;j++)
		  {
			  if(a[i]>a[j])
			  {
				  temp=a[i];
				  a[i]=a[j];
				  a[j]=temp;
			  }
			  
		  }
	  System.out.println("冒泡排序后：");
	  System.out.printf("[");
	  for (int k=0;k<count;k++)
	  {
		  System.out.printf(a[k]+" ");
	  }
	  System.out.printf("]");
	  System.out.printf("\n");
  }
}