Display Traingle as follow in java

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Program ::

 class triangle

{

            public static void main(String args[])

            {

                        int i,j,n=4,k=1;

                        for(i=0;i<n;i++)

                        {

                                    for(j=0;j<=i;j++)

                                    {

                                                System.out.print(" "+k);

                                                k++;

                                    }

                                    System.out.println();

                        }

            }

}