冒泡排序
算法思想是每次从数组末端开始比较相邻俩元素，把第i小的冒泡到数组的第i个位置。i从0一直到N-1从而完成排序。当然也可以从数组开始端开始比较相邻两元素，把第i大的冒泡到第N-i个位置。I从0一直到N-1从而完成排序。
publicabstractclass Sorter<E extends Comparable<E>> {
publicabstractvoid sort(E[] array,int from ,int len);
publicfinalvoid sort(E[] array)
{
sort(array,0,array.length);
}
protectedfinalvoid swap(E[] array,int from ,int to)
{
E tmp=array[from];
array[from]=array[to];
array[to]=tmp;
}
publicvoid sort(String helloString, int from, int len) {
// TODO Auto-generated method stub
}
}
publicclass BubbleSorter<E extends Comparable<E>> extends Sorter<E> {
privatestaticbooleanDOWN=false;
publicfinalvoid bubble_down(E[] array, int from, int len){
for(int i=from;i<from+len;i++){
for(int j=from+len-1;j>i;j--){
if(array[j].compareTo(array[j-1])<0){
swap(array,j-1,j);
}
}
}
}
publicfinalvoid bubble_up(E[] array, int from, int len){
for(int i=from+len-1;i>=from;i--){
for(int j=from;j<i;j++){
if(array[j].compareTo(array[j+1])<0){
swap(array,j,j+1);
}
}
}
}
@Override
publicvoid sort(E[] array, int from, int len) {
// TODO Auto-generated method stub
if(DOWN){
bubble_down(array,from,len);
}else{
bubble_up(array,from,len);
}
}
publicstaticvoid main(String[] args){
BubbleSorter s1 = new BubbleSorter<String>();
String[] myStringArray1 = {"2","5","1","9","4"};
for(int i=0;i<5;i++){
System.out.println(myStringArray1[i]);
}
s1.sort(myStringArray1, 0, 5);
for(int i=0;i<5;i++){
System.out.println(myStringArray1[i]);
}
}
}
Output:
2
5
1
9
4
9
5
4
2
1