class Demo { private static int a[]={1,2,3,4,5,6}; private static void binary_search(int key) { int low=0,high=5,mid=0; while(low<=high) { mid=(low+high)/2; //此处不能是low/2+high/2 if(key<a[mid]) high=mid-1; else if(key>a[mid]) low=mid+1; else {System.out.println(mid);System.exit(0);} } System.out.println(0); } public static void main(String argv[]) { binary_search(2); } }
class Demo { private static int a[]={10,2,3,8,5,6}; private static void bubble() { int i,j; int temp; boolean flag=true; for(i=0;i<6 && flag ;i++) { flag=false; for(j=0;j<6-1-i;j++) { if(a[j]<a[j+1]) { temp=a[j]; a[j]=a[j+1]; a[j+1]=temp; flag=true; } } } } public static void main(String argv[]) { bubble(); for(int i=0;i<6;i++) { System.out.println(a[i]); } } }