Pattern problem in java.

Need to display right angle triangle format with decreasing term based on the input.

	import java.util.*;
	public class PatternProblem {
	public static void main(String [] args){
	Scanner in=new Scanner(System.in);
	int n=in.nextInt();
	int num=n;
	String number=String.valueOf(num);
	int len=number.length();
	for(int i=1;i<=n;i++){
	for(int j=1;j<num*len+(num-len);j++){
	System.out.print(" ");
	}
	num--;
	int space=0; //this variable decides how many space to be left.
	for(int k=1;k<i;k++){
	if(i<10){
	space=len;
	}else if(i>=10 && i<100){
	space=len-1;
	}else if(i>=100 && i<1000){
	space=len-2;
	}
	System.out.print(i);
	for(int f=1;f<=space;f++){
	System.out.print(" ");
	}
	}
	System.out.println(i);
	}
	in.close();
	}
	}

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Input
5

output:
            1
         2 2
      3 3 3
   4 4 4 4
5 5 5 5 5