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對二維陣列的遍歷求和

二維陣列的遍歷,求和
        int [] [] s = {{1,2,3,4},{5,6,7,8,3,3},{9,10,11,12}};
        int sum=0;
        for (int i = 0; i < s.length; i++) {
            for (int j = 0; j < s[i].length; j++) {
                sum+=s[i][j];
            }
        }
        System.out.println(sum);
        Console:84;