黑马程序员—数组最大值、最小值、选择排序、冒泡排序

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打印数组最大值class Demo{public static int getMax(int[] arr){int max =0;for(int x= 0;x<arr.length;x++){if(arr[x]>max)max=arr[x];}return max;}public static void main(String[]args){int[] arr={5,2,8,1,9,3};int max = getMax(arr);System.out.println("max="+max);}}打印数组最小值class Demo{public static int getMin(int[] arr){int min = 0;for(int x = 0;x<arr.length;x++){if(arr[x]<min)min = arr[x];}return min;}public static void main(String[] args){int[] arr={5,2,8,1,9,3};int min = getMin(arr);System.out.println("min="+min);}}选择排序class Demo{public static void selectSort(int[] arr){for(int x =0; x<arr.length-1;x++){for(int y=x+1;y<arr.length;y++){if(arr[x]>arr[y]){int temp = arr[x];arr[x] = arr[y];arr[y]=temp;}}}}public static void printArray(int[] arr){System.out.print("[");for(int x =0;x<arr.length;x++){if(x!=arr.length-1)System.out.print(arr[x]+",");elseSystem.out.println(arr[x]+"]");}}public static void main(String[] args){int[] arr={5,2,8,1,9,3};printArray(arr);selectSort(arr);printArray(arr);}}冒泡排序class Demo{public static void bubbleSort(int[] arr){for(int x=0;x<arr.length-1;x++){for(int y=0;y<arr.length-x-1;y++){if(arr[y]>arr[y+1]){int temp = arr[y];arr[y] = arr[y+1];arr[y+1]=temp;}}}}public static void printArray(int[] arr){System.out.print("[");for(int x =0;x<arr.length;x++){if(x!=arr.length-1)System.out.print(arr[x]+",");elseSystem.out.println(arr[x]+"]");}}public static void main(String[] args){int[] arr={5,2,8,1,9,3};printArray(arr);bubbleSort(arr);printArray(arr);}}

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