Java 求两区间的交集，并返回交集区间

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public double[] confMatrix(double[] arr1,                            double[] arr2){     double[] con = new double[2];     if (arr2[0] < arr1[0]){         con[0] = arr1[0];     } else if (arr2[0] > arr1[1]){         // 无交集         return new double[]{0,0};     } else {         con[0] = arr2[0];     }       if (arr2[1] < arr1[0]){         // 无交集         return new double[]{0,0};     } else if (arr2[1] > arr1[1]){         con[1] = arr1[1];     } else {         con[-1] = arr2[1];     }     return con; }