可选:可选
int [ ] arr1={ 1,5,3,6,7 }; intsum=Arrays.stream(arr1).sum ); //optionaldoubleavg=arrays.stream (arr1).average ); //求平均值的double average=avg.getAsDouble (; intmin=Arrays.stream(arr1).min ).getAsInt ); //最小值intmax=arrays.stream(arr1).max ).getAsInt ); //最大值system.out.println(arr1和=' sum )、平均值=' average )、最小值=' min )、最大值=' max );