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求3-50之间的孪生素数

Java代码如下：

public class luanshengsushu {
	
	public static void main(String[] args) {
		 int i,j;
		 int s=1;
	        int  n = 0;
	        boolean flag=true;
	        int a[] = new int[50];
	        
	        for(i = 3; i <= 50; i++)
	        {
	            flag = true;
	            
	            for(j = 2; j < i; j++)
	            {
	                if(i%j == 0)
	                {
	                    flag = false;
	                    break;
	                }
	            }
	            
	            if(flag == true)
	            {
	                a[n] = i;
	                n++;
	            }
	            
	        }
	        
	        System.out.println("3-50之间的孪生素数如下：");
	        
	        for(i = 0; i < n-1; i++)
	        {
	            if(a[i+1]-a[i] == 2)
	            { System.out.print("第"+s+"组：");
	                System.out.print(a[i]+" ");
	                System.out.print(a[i+1]+" ");
	                System.out.print("\n");
	                s++;
	            }
	        }
}
}