海康转正答辩突击总结

素颜马尾好姑娘i 2024-04-17 16:57 30阅读 0赞

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虚拟机把描述类的数据从Class文件加载到内存，并对数据进行校验、转换解析和初始化，最终形成可以被虚拟机直接使用的Java类型，这就是虚拟机的类加载机制。

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快速排序使用分治法（Divide and conquer）策略来把一个串行（list）分为两个子串行（sub-lists）  
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import java.util.Arrays;
    
    public class QuickSort{ 
    
        public int[] sort(int[] sourceArray) throws Exception { 
            // 对 arr 进行拷贝，不改变参数内容
            int[] arr = Arrays.copyOf(sourceArray, sourceArray.length);
    
            return quickSort(arr, 0, arr.length - 1);
        }
    
        private int[] quickSort(int[] arr, int left, int right) { 
            if (left < right) { 
                int partitionIndex = partition(arr, left, right);
                quickSort(arr, left, partitionIndex - 1);
                quickSort(arr, partitionIndex + 1, right);
            }
            return arr;
        }
    
        private int partition(int[] arr, int left, int right) { 
            // 设定基准值（pivot）
            int pivot = left;
            int index = pivot + 1;
            for (int i = index; i <= right; i++) { 
                if (arr[i] < arr[pivot]) { 
                    swap(arr, i, index);
                    index++;
                }
            }
            swap(arr, pivot, index - 1);
            return index - 1;
        }
    
        private void swap(int[] arr, int i, int j) { 
            int temp = arr[i];
            arr[i] = arr[j];
            arr[j] = temp;
        }
    
    }

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