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public class BubbleSort { public static void main(String[] args) { int[] array = {10,34,5,0,9}; //test data sort(array); for(int el : array) { System.out.print(el + " "); } } static void sort(int[] array) { int length = array.length; System.out.print("length" + length + "\n"); int temp; boolean isSort; for(int i = 1; i < length; i++) { isSort = false; for(int j = 0; j < length - i; j++) { if(array[j] > array[j+1]) { //交换 temp = array[j]; array[j] = array[j+1]; array[j+1] = temp; isSort = true; } } if(!isSort) break; //如果没有发生交换，则退出循环 } } }

public class FindTest{public static void main(String[] args){int[] src = {1, 3, 5, 9, 8};int result = binarySearch(src, 9);System.out.println(result + "");}//查找des在array数组中的下标public static int binarySearch(int[] array, int des){int low = 0;int high = array.length - 1;while(low <= high){int middle = (high + low)/2;if(des == array[middle]){return middle;}else if(des < array[middle]){high = middle - 1;}else{low = middle + 1;}}return -1;}}

public class TestString{public static void main(String[] args){String str = "1234";change(str);System.out.println("str is " + str);}static void change(String str){str = "boyaa";}}

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