print triangle in java

import java.io.*;
class Triangle {
public static void main(String args[])throws IOException {
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Entert any no");
int re=Integer.parseInt(br.readLine());
int a[]=new int[re+1];
int b[]=new int[re+1];
a[0]=1;
for(int i=0;i<re;i++) {
for(int j=1;j<=i+1;j++) {
if(i==0)
break;
else a[j]=b[j-1]+b[j];
}
for(int j=0;j<a.length;j++) b[j]=a[j];
for(int m=re;m>i;m--)System.out.print(" ");
for(int j=0;j<a.length;j++) {
if(a[j]==0) continue;
System.out.print(a[j]+" ");
}
System.out.println();
}
}
}