Java computer training questions 1

Beginners to learn Java, simple computer training questions

Question
: Write a program to set the initial value of variable n to 1678, and then use the division operation, area and operation to extract and print each digit of the variable. The output result is: n=1678 Each digit of n is
1
, 6, 7, 8
procedures are as shown in the figure

import java.io.*;//导入所需要的公用类
public class cla {
    
    
	/**
	 * @param args
	 */
	public static void main(String[] args) throws IOException
	{
    
    
		// TODO Auto-generated method stub
		//下面几行语句的作用是从键盘输入一个整数并存到变量f中
	    InputStreamReader ir;
	    BufferedReader in;
	    ir=new InputStreamReader(System.in);
	    in=new BufferedReader(ir);
		String s=in.readLine();
		int f=Integer.parseInt(s);
		int j=s.length();//计算整数的长度
	    int x=f,i=0;
	    int [] a = new int [j];//定义一个一维数组存储整数的值
	    while(x>0)
	    {
    
    
	    	a[i]=x%10;
	    	x=x/10;
	    	i++;
	    }
	    System.out.println("n="+f);
	    for(i=j-1;i>=0;i--)
	    {
    
    
	    	if(i==j-1)
	    		 System.out.print("n的每位数字是");
	    	 System.out.print(a[i]);
	    	 if(i!=0)
		    		System.out.print(", ");
	    }
	}
}

The output result is