Llenar una matriz triangular superior


Programa en java para llenar una matriz triangular superior.

2  3  4  4
0  3  7  2
0  0  8  9
0  0  0  3

import java.io.*;
class matriz_05 {
    static int mat[][]=new int[100][100];
    public static void main(String[] args)throws IOException {
        int n;
        InputStreamReader isr=new InputStreamReader(System.in);
        BufferedReader br=new BufferedReader(isr);
        System.out.println("Introduzca n: ");
        n=Integer.parseInt(br.readLine());
        System.out.println();
        System.out.println("Introduzca elementos a la matriz: ");
        for(int i=1;i<=n;i++){
            for(int j=1;j<=n;j++){
                if(j>=i){
                    mat[i][j]=Integer.parseInt(br.readLine());
                }
            }
        }
        for(int i=1;i<=n;i++){
            for(int j=1;j<=n;j++){
                System.out.print(" "+mat[i][j]);
            }
            System.out.println();
        }
    }
}

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