Help me with this code?

Question

import java.io.*;
class Matrix
{
public static void main(String args[])
{
int n,i,j,k;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in))throws IOException
System.out.println("enter n value"+n);
n=Integer.parseInt(br.readLine());
System.out.println("enter the matrix a");
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
int a[i][j]=Integer.parseInt(br.readLine ());

}
System.out.println("enter the matrix b");
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
int b[i][j]=Integer.parseInt(br.readLine());

}

for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
System.out.println("Addition is:"+(a[i][j]+b[i][j]));
}
}
}

Answer 1

import java.io.*;
class Matrix
{
public static void main(String args[]) throws IOException //method can throws , not statements
{
int n,i,j,k;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("enter n value :"); //n is uninitialized so you cant use here
n=Integer.parseInt(br.readLine());

//declare array here, in loop its wrong
int a[][] = new int[n][n];
int b[][] = new int[n][n];

System.out.println("enter the matrix a");
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
a[i][j]=Integer.parseInt(br.readLine());
}

System.out.println("enter the matrix b");
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
b[i][j]=Integer.parseInt(br.readLine());
}

for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
System.out.println("Addition is:"+(a[i][j]+b[i][j]));
}
}
}