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利用java实现数据结构中常用的插入排序和快速排序算法

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package Sort;

class Data {

Comparable key;

Object value;

public Data() {

}

public Data(Data data){

this.key=data.key;

this.value=data.value;

}

public Data(Comparable key,Object value){

this.key=key;51Testing软件测试网D1idX,U5b

this.value=value;

}

public String toString(){

return "key="+key+";"+"value="+value+";"+"\n";

}

Insertion.java

package Sort;

public class InsertionSort {

public InsertionSort() {51Testing软件测试网)X*O5q}Aa

}

//直接插入排序,从下标1开始

public static void straightInsertionSort(Data[] data) {51Testing软件测试网YO]i.X2t0S

int i, j;

for (i = 2; i <data.length; i++) {

if (data[i].key.compareTo(data[i - 1].key) < 0) {51Testing软件测试网"|"\6^)X'@

data[0] = data[i];//复制为监视哨

for (j = i - 1; data[0].key.compareTo(data[j].key) < 0; --j) {51Testing软件测试网%qxu QR

data[j + 1] = data[j];//记录右移

}

data[j + 1] = data[0];//插入51Testing软件测试网:C*p\!a5wK

}51Testing软件测试网*{'`%C$w~'n.c

}

}51Testing软件测试网"wT&oW\[

//折半插入排序,从下标1开始

public static void BinaryInsertionSort(Data[] data){51Testing软件测试网2x)Wcw']/K'r

int i,j,low,high,mid;51Testing软件测试网:Q#vHgf

for(i=2;i<data.length;i++){51Testing软件测试网t5|EDQA

if (data[i].key.compareTo(data[i - 1].key) < 0) {

data[0]=data[i];

//找插入位置

low=1;high=i-1;51Testing软件测试网 O.\X;Ku

while(low<=high){

mid =(low+high)/2;51Testing软件测试网|~q1@/tQ

if(data[0].key.compareTo(data[mid].key)<0) high=mid-1;

else low=mid+1;51Testing软件测试网SE*y,x,XsrK

}

//移动插入位置以后的元素51Testing软件测试网v-b0j Bp2N C

for(j=i-1;j>=high+1;j--){51Testing软件测试网#p|a\;k;n

data[j+1]=data[j];

}

data[high+1]=data[0];//插入

}

}51Testing软件测试网,P.@|z:j9We2?

}51Testing软件测试网4oqO4QO7L

51Testing软件测试网 A.FS%H"D

//表插入排序51Testing软件测试网{,W QiGpA

public static void ListInsertionSort(Data[] data){

int i,j,k;

//inner class:Table

class Table{51Testing软件测试网\,NN:u V5@z4|

Comparable key;

int next;

}51Testing软件测试网w;~U,@Wh

Table[] table=new Table[data.length];51Testing软件测试网D2}[7l2w)@2j

for(i=1;i<data.length;i++){

table[i]=new Table();51Testing软件测试网,F$j] {VO!e*[

table[i].key=data[i].key;51Testing软件测试网[sm!@T7q

}51Testing软件测试网 i"K._8JR9tQL

table[0]=new Table();

table[0].key=new Integer(Integer.MAX_VALUE);

table[0].next=1;

table[1].next=0;

for(i=2;i<data.length;i++){

for(j=0,k=table[0].next;table[k].key.compareTo(table[i].key)<=0;j=k,k=table[k].next);

table[j].next=i;

table[i].next=k;51Testing软件测试网&]1Sm0D3]8A

}51Testing软件测试网H2s;wy6sO(n

Data[] newData=new Data[data.length];51Testing软件测试网#AD6orMz+DN

int position=table[0].next;51Testing软件测试网+t?~:} Jm#Kl

for(i=1;i<data.length;i++){51Testing软件测试网*{;_B!B9q

newData[i]=data[position];

position=table[position].next;51Testing软件测试网&py)C2Cp0o

}

//data=newData;//不知为什么不能把newData赋给data，而必须用下面的

for(i=1;i<data.length;i++){

data[i]=newData[i];

}

}51Testing软件测试网W0_MAA6@6B

}

QuickSort.java

package Sort;51Testing软件测试网6knx-J[&wPV

import Queue.*;51Testing软件测试网`!q3|#O9~

51Testing软件测试网 G|*E|{.w@D

public class QuickSort {

public QuickSort() {

}51Testing软件测试网W5u-|s8B

//起泡排序51Testing软件测试网i6FA-ty

public static void BubbleSort(Data[] data) {

int i, j, lastChangeIndex;

Data temp;

i = data.length - 1;

while (i > 1) {

lastChangeIndex = 1;51Testing软件测试网!Myj:R9P+Z

for (j = 1; j < i; j++) {51Testing软件测试网nI|Nu~!C

if (data[j + 1].key.compareTo(data[j].key) < 0) {51Testing软件测试网ae9~JhHX

temp = data[j + 1];

data[j + 1] = data[j];51Testing软件测试网 c!y~zH|5q

data[j] = temp;

lastChangeIndex = j;51Testing软件测试网9[N-qJgx'g4_

}

i = lastChangeIndex;

}

}51Testing软件测试网 z"sd"a/d7|I6o

//快速排序51Testing软件测试网&P;i#xJ!I+kB

public static void QuickSort(Data[] data) {

QSort(data, 1, data.length - 1);

}51Testing软件测试网R-]:m9|UHz

51Testing软件测试网8DbmV9i*Y`y

public static void OptimizeQuickSort(Data[] data){51Testing软件测试网U9q` X+L7[#]

OQSort(data,1,data.length-1);

}51Testing软件测试网bQ!~)^J

51Testing软件测试网8O3s ~O`CY

private static void QSort(Data[] data, int s, int t) {

int pivotLoc;

if (s < t) {

pivotLoc = Partition(data, s, t); //对data[1...data.length-1]进行一次划分

QSort(data, s, pivotLoc - 1); //对低子序列进行递归排序

QSort(data, pivotLoc + 1, t); //对高子序列进行递归排序51Testing软件测试网#n8@+J2I,K4ov

}51Testing软件测试网@_8A3JzH;e$]

}

private static void OQSort(Data[] data,int s,int t){51Testing软件测试网%K]Db.W6R/h7d

int pivotLoc;

if(s<t){

pivotLoc=RandomPartition(data,s,t);

QSort(data, s, pivotLoc - 1); //对低子序列进行递归排序

QSort(data, pivotLoc + 1, t); //对高子序列进行递归排序

}

private static int RandomPartition(Data[] data,int low,int high){

//i是low51Testing软件测试网4h6p/\YH? g

int i=(int)Math.random()*(high-low)+low;

Data temp=data[low];

data[low]=data[i];51Testing软件测试网-@S.HaMo

data[i]=temp;51Testing软件测试网?4}pQz8Z

return Partition(data,low,high);51Testing软件测试网F3GP#Aa

}51Testing软件测试网4aEM'?/vY|

private static int Partition(Data[] data, int low, int high) {

Comparable pivotKey;51Testing软件测试网4}t?lr1]`(A

data[0] = data[low];

pivotKey = data[low].key; //枢轴

while (low < high) {

while (low < high && data[high].key.compareTo(pivotKey) >= 0) {

high--;

}51Testing软件测试网_!n1u?S7m

data[low] = data[high];

while (low < high && data[low].key.compareTo(pivotKey) <= 0) {

low++;

}

data[high] = data[low];

}

data[low] = data[0];51Testing软件测试网/[&O x Al,wR

return low;51Testing软件测试网#Wk5kR-|?v$k

}

51Testing软件测试网k#YCh r

//堆排序

public static void HeapSort(Data[] data) {

//先对顺序表进行堆排序，建立大顶堆

int i;

Data temp;

for (i = (data.length-1)/2; i > 0; i--) {51Testing软件测试网"D5GE/O(j)vM

HeapAdjust(data, i, data.length-1);

} //建立大顶堆

for (i = (data.length - 1); i >1; i--) {

temp = data[1];51Testing软件测试网+[+d$JKF3}q

data[1] = data[i];51Testing软件测试网 A9K zk.c5{

data[i] = temp;

HeapAdjust(data, 1, i - 1);51Testing软件测试网P"llU TW

}

private static void HeapAdjust(Data[] data, int start, int end) {51Testing软件测试网@yI:T'f3A b:p

int j;

Data temp;

temp = data[start];51Testing软件测试网QZ LBO']-Q

for (j = 2 * start; j <=end; j *=2) {

if (j < end && data[j].key.compareTo(data[j+1].key) < 0) {51Testing软件测试网^RU8w~6aW

j++;

}

if (temp.key.compareTo(data[j].key) >= 0) {

break;

}

data[start] = data[j];51Testing软件测试网]2y FT$n

start = j;

}51Testing软件测试网Mhu~9Oq

data[start] = temp;

}51Testing软件测试网a6Wx8KP%ZU

//简单选择排序

public static void SimpleSelectSort(Data[] data) {

int i, j;

Data temp;

for (i = 1; i < data.length; i++) {

j = MinKey(data, i);

if (j != i) {

temp = data[i];51Testing软件测试网k,US,K Xf

data[i] = data[j];

data[j] = temp;

}

}51Testing软件测试网%p![9{_X

}

51Testing软件测试网o#v~!SP5S

private static int MinKey(Data[] data, int start) {51Testing软件测试网 F!?%r^^

int i, j = start;

Comparable temp;

temp = data[start].key;51Testing软件测试网;n `H otc*_

if (data.length - start == 0) {51Testing软件测试网|s9Ph`%h

return start;

利用java实现数据结构中常用的插入排序和快速排序算法

Insertion.java

QuickSort.java

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