Easy Java Code|| Beginner friendly
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```\nclass Solution {\n    public int diagonalSum(int[][] mat) {\n        int sum=0;\n        int k=mat.length;\n        for(int i=0;i<mat.length;i++){//first loop\n            for(int j=0;j<mat.length;j++){//2nd loop\n                if(i==j || i+j==mat.length-1){//same as printing "X" pattern\n                    sum+=(mat[i][j]);//getting sum\n                }\n                \n            }\n        }\n        return sum;//return sum\n    }\n}\n```
['Java']