What is the Java program to print the following pattern 1 234 56789 101112 13?

Java

class pattern

{

void main() throws IOException

{

int i,j;

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

System.out.print("Enter n terms");

i=Integer.parseInt(br.readLine());

for(i=1;i<=4;i++)

{

for(j=1;j<=i;j++)

{

System.out.print(j);

}

System.out.println();

}

}

}