Java中各种排序算法是怎么实现的一般是上机或者描述文档格式.docx
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冒泡排序:
publicclassBubbleSortimplementsSortUtil.Sort{
for(inti=0;
for(intj=data.length-1;
j>
i;
j){
if(data[j]
选择排序:
publicclassSelectionSortimplementsSortUtil.Sort{
/*
*(non-Javadoc)
*
for(inti=0;
i>
intlowIndex=i;
for(intj=data.length1;
j>
i;
j){
if(data[j]
lowIndex=j;
SortUtil.swap(data,i,lowIndex);
Shell排序:
publicclassShellSortimplementsSortUtil.Sort{
for(inti=data.length/2;
i>
2;
i/=2){
for(intj=0;
j
insertSort(data,j,i);
insertSort(data,0,1);
*@paramdata
*@paramj
*@parami
privatevoidinsertSort(int[]data,intstart,intinc){
for(inti=start+inc;
=inc)(data[j]
SortUtil.swap(data,j,j-inc);
快速排序:
publicclassQuickSortimplementsSortUtil.Sort{
quickSort(data,0,data.length-1);
privatevoidquickSort(int[]data,inti,intj){
intpivotIndex=(i+j)/2;
//swap
SortUtil.swap(data,pivotIndex,j);
intk=partition(data,i-1,j,data[j]);
SortUtil.swap(data,k,j);
if((k-i)>
1)quickSort(data,i,k-1);
if((j-k)>
1)quickSort(data,k+1,j);
*@return
privateintpartition(int[]data,intl,intr,intpivot){
do{
while(data[++l]
while((r!
=0)data[--r]>
pivot);
SortUtil.swap(data,l,r);
while(l
returnl;
改进后的快速排序:
publicclassImprovedQuickSortimplementsSortUtil.Sort{
privatestaticintMAX_STACK_SIZE=4096;
privatestaticintTHRESHOLD=10;
int[]stack=newint[MAX_STACK_SIZE];
inttop=-1;
intpivot;
intpivotIndex,l,r;
stack[++top]=0;
stack[++top]=data.length-1;
while(top>
0){
intj=stack[top--];
inti=stack[top--];
pivotIndex=(i+j)/2;
pivot=data[pivotIndex];
//partition
l=i-1;
r=j;
=0)(data[--r]>
pivot));
SortUtil.swap(data,l,j);
if((l-i)>
THRESHOLD){
stack[++top]=i;
stack[++top]=l-1;
if((j-l)>
stack[++top]=l+1;
stack[++top]=j;
//newInsertSort().sort(data);
insertSort(data);
privatevoidinsertSort(int[]data){
归并排序:
publicclassMergeSortimplementsSortUtil.Sort{
int[]temp=newint[data.length];
mergeSort(data,temp,0,data.length-1);
privatevoidmergeSort(int[]data,int[]temp,intl,intr){
intmid=(l+r)/2;
if(l==r)return;
mergeSort(data,temp,l,mid);
mergeSort(data,temp,mid+1,r);
for(inti=l;
temp[i]=data[i];
inti1=l;
inti2=mid+1;
for(intcur=l;
cur
if(i1==mid+1)
data[cur]=temp[i2++];
elseif(i2>
r)
data[cur]=temp[i1++];
elseif(temp[i1]
else
改进后的归并排序:
publicclassImprovedMergeSortimplementsSortUtil.Sort{
privatestaticfinalintTHRESHOLD=10;
privatevoidmergeSort(int[]data,int[]temp,intl,intr){
inti,j,k;
intmid=(l+r)/2;
if(l==r)
return;
if((midl)>
=THRESHOLD)
mergeSort(data,temp,l,mid);
insertSort(data,l,midl+1);
if((rmid)>
THRESHOLD)
mergeSort(data,temp,mid+1,r);
insertSort(data,mid+1,rmid);
for(i=l;
i
temp[i]=data[i];
for(j=1;
j
temp[r-j+1]=data[j+mid];
inta=temp[l];
intb=temp[r];
for(i=l,j=r,k=l;
k
if(a
data[k]=temp[i++];
a=temp[i];
}else{
data[k]=temp[j--];
b=temp[j];
*@paraml
privatevoidinsertSort(int[]data,intstart,intlen){
for(inti=start+1;
start)data[j]
堆排序:
publicclassHeapSortimplementsSortUtil.Sort{
MaxHeaph=newMaxHeap();
h.init(data);
h.remove();
System.arraycopy(h.queue,1,data,0,data.length);
privatestaticclassMaxHeap{
voidinit(int[]data){
this.queue=newint[data.length+1];
queue[++size]=data[i];
fixUp(size);
privateintsize=0;
privateint[]queue;
publicintget(){
returnqueue[1];
publicvoidremove(){
SortUtil.swap(queue,1,size);
fixDown
(1);
//fixdown
privatevoidfixDown(intk){
intj;
while((j=k>
if(j
j++;
if(queue[k]>
queue[j])//不用交换
break;
SortUtil.swap(queue,j,k);
k=j;
privatevoidfixUp(intk){
while(k>
1){
intj=k>
>
1;
if(queue[j]>
queue[k])
SortUtil:
packageorg.rut.util.algorithm;
importorg.rut.util.algorithm.support.BubbleSort;
importorg.rut.util.algorithm.support.HeapSort;
importorg.rut.util.algorithm.support.ImprovedMergeSort;
importorg.rut.util.algorithm.support.ImprovedQuickSort;
importorg.rut.util.algorithm.support.InsertSort;
importorg.rut.util.algorithm.support.MergeSort;
importorg.rut.util.algorithm.support.QuickSort;
importorg.rut.util.algorithm.support.SelectionSort;
importorg.rut.util.algorithm.support.ShellSort;
publicclassSortUtil{
publicfinalstaticintINSERT=1;
publicfinalstaticintBUBBLE=2;
publicfinalstaticintSELECTION=3;
publicfinalstaticintSHELL=4;
publicfinalstaticintQUICK=5;
publicfinalstaticintIMPROVED_QUICK=6;
publicfinalstaticintMERGE=7;
publicfinalstaticintIMPROVED_MERGE=8;
publicfinalstaticintHEAP=9;
publicstaticvoidsort(int[]data){
sort(data,IMPROVED_QUICK);
privatestaticString[]name={
insert,bubble,selection,shell,quick,improved_quick,merge,improved_merge,heap
};
privatestaticSort[]impl=newSort[]{
newInsertSort(),
newBubbleSort(),
newSelectionSort(),
newShellSort(),
newQuickSort(),
newImprovedQuickSort(),
newMergeSort(),
newImprovedMergeSort(),
newHeapSort()
publicstaticStringtoString(intalgorithm){
returnname[algorithm-1];
publicstaticvoidsort(int[]data,intalgorithm){
impl[algorithm-1].sort(data);
publicstaticinterfaceSort{
publicvoidsort(int[]data);
publicstaticvoidswap(int[]data,inti,intj){
inttemp=data[i];
data[i]=data[j];
data[j]=temp;