[JAVA]用Java实现的各种排序

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0 发表于: 2007-03-15

用Java语言实现的各种排序，包括插入排序、冒泡排序、选择排序、Shell排序、快速排序、归并排序、堆排序、SortUtil等。
插入排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;
/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
public class InsertSort implements SortUtil.Sort{

/* (non-Javadoc)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
*/
public void sort(int[] data) {
int temp;
for(int i=1;i for(int j=i;(j>0)%26amp;%26amp;(data[j] SortUtil.swap(data,j,j-1);
}
}
}

}

冒泡排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;

/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
public class BubbleSort implements SortUtil.Sort{

/* (non-Javadoc)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
*/
public void sort(int[] data) {
int temp;
for(int i=0;i for(int j=data.length-1;j>i;j--){
if(data[j] SortUtil.swap(data,j,j-1);
}
}
}
}

}

选择排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;

/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
public class SelectionSort implements SortUtil.Sort {

/*
* (non-Javadoc)
*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
*/
public void sort(int[] data) {
int temp;
for (int i = 0; i < data.length; i++) {
int lowIndex = i;
for (int j = data.length - 1; j > i; j--) {
if (data[j] < data[lowIndex]) {
lowIndex = j;
}
}
SortUtil.swap(data,i,lowIndex);
}
}

}

Shell排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;

/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
public class ShellSort implements SortUtil.Sort{

/* (non-Javadoc)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
*/
public void sort(int[] data) {
for(int i=data.length/2;i>2;i/=2){
for(int j=0;j insertSort(data,j,i);
}
}
insertSort(data,0,1);
}

/**
* @param data
* @param j
* @param i
*/
private void insertSort(int[] data, int start, int inc) {
int temp;
for(int i=start+inc;i for(int j=i;(j>=inc)%26amp;%26amp;(data[j] SortUtil.swap(data,j,j-inc);
}
}
}

}

快速排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;

/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
public class QuickSort implements SortUtil.Sort{

/* (non-Javadoc)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
*/
public void sort(int[] data) {
quickSort(data,0,data.length-1);
}
private void quickSort(int[] data,int i,int j){
int pivotIndex=(i+j)/2;
file://swap
SortUtil.swap(data,pivotIndex,j);

int k=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);

}
/**
* @param data
* @param i
* @param j
* @return
*/
private int partition(int[] data, int l, int r,int pivot) {
do{
while(data[++l] while((r!=0)%26amp;%26amp;data[--r]>pivot);
SortUtil.swap(data,l,r);
}
while(l SortUtil.swap(data,l,r);
return l;
}

}

改进后的快速排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;

/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
public class ImprovedQuickSort implements SortUtil.Sort {

private static int MAX_STACK_SIZE=4096;
private static int THRESHOLD=10;
/* (non-Javadoc)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
*/
public void sort(int[] data) {
int[] stack=new int[MAX_STACK_SIZE];

int top=-1;
int pivot;
int pivotIndex,l,r;

stack[++top]=0;
stack[++top]=data.length-1;

while(top>0){
int j=stack[top--];
int i=stack[top--];

pivotIndex=(i+j)/2;
pivot=data[pivotIndex];

SortUtil.swap(data,pivotIndex,j);

file://partition
l=i-1;
r=j;
do{
while(data[++l] while((r!=0)%26amp;%26amp;(data[--r]>pivot));
SortUtil.swap(data,l,r);
}
while(l SortUtil.swap(data,l,r);
SortUtil.swap(data,l,j);

if((l-i)>THRESHOLD){
stack[++top]=i;
stack[++top]=l-1;
}
if((j-l)>THRESHOLD){
stack[++top]=l+1;
stack[++top]=j;
}

}
file://new InsertSort().sort(data);
insertSort(data);
}
/**
* @param data
*/
private void insertSort(int[] data) {
int temp;
for(int i=1;i for(int j=i;(j>0)%26amp;%26amp;(data[j] SortUtil.swap(data,j,j-1);
}
}
}

}

归并排序：

package org.rut.util.algorithm.support;

import org.rut.util.algorithm.SortUtil;

/**
* @author treeroot
* @since 2006-2-2
* @version 1.0
*/
public class MergeSort implements SortUtil.Sort{

/* (non-Javadoc)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
*/
public void sort(int[] data) {
int[] temp=new int[data.length];
mergeSort(data,temp,0,data.length-1);
}

private void mergeSort(int[] data,int[] temp,int l,int r){
int mid=(l+r)/2;
if(l==r) return ;
mergeSort(data,temp,l,mid);
mergeSort(data,temp,mid+1,r);
for(int i=l;i<=r;i++){
temp=data; Ucv-}oa-?
} HZR~r:_ i
int i1=l; NX$$4<A1
int i2=mid+1; \s[Uq
for(int cur=l;cur<=r;cur++){ F`f#gpQ
if(i1==mid+1) R7+k=DI
data[cur]=temp[i2++]; ! XA07O[@
else if(i2>r) e%"L79Of6)
data[cur]=temp[i1++]; yt$V<8a
else if(temp[i1] data[cur]=temp[i1++]; UA}k"uM
else d!!5'/tmS
data[cur]=temp[i2++]; u"tv6Qp
} A2]N :=
} "#(]{MY
IS"UBJ6p
} Yk[yG;W
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改进后的归并排序: )'92{-A0
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package org.rut.util.algorithm.support; <Cm:4)~
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import org.rut.util.algorithm.SortUtil; jRzR`>5
.BZw7 YV
/** (1*?2u*j
* @author treeroot v@[MX- ,8
* @since 2006-2-2 TR|G4l?
* @version 1.0 % `\8z
*/ J7$5<
public class ImprovedMergeSort implements SortUtil.Sort { RytQNwv3
qd"*Td
private static final int THRESHOLD = 10; P5kkaLzG
db4Ol=
/* LKtr>u
* (non-Javadoc) !1;DRF
* UEt#;e
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8&B{bS
*/ sJ25<2/
public void sort(int[] data) { 9w(QM-u
int[] temp=new int[data.length]; Rax}r
mergeSort(data,temp,0,data.length-1); 3%>"|Ye}A
} TAIcp*)ZM
gtJUQu p2
private void mergeSort(int[] data, int[] temp, int l, int r) { 4, 8gf2
int i, j, k; =DUsQN!
int mid = (l + r) / 2; 0~Z2$`(
if (l == r) =#SKN\4
return; YB.r-c"Y
if ((mid - l) >= THRESHOLD) ZmUS}
mergeSort(data, temp, l, mid); hI]KT a
else =k'3rm*ld
insertSort(data, l, mid - l + 1); aV,>y"S
if ((r - mid) > THRESHOLD) UIIR$,XB
mergeSort(data, temp, mid + 1, r); 3L/>=I{5
else JmtU>2z\
insertSort(data, mid + 1, r - mid); w*OZ1|
rU%\ 8T0f
for (i = l; i <= mid; i++) { .^fq$7Y}7
temp = data; esWgYAc3{
} ySL 31%
for (j = 1; j <= r - mid; j++) { ^;!A`t
temp[r - j + 1] = data[j + mid]; G/bWn@
} 5,|^4 ZA
int a = temp[l]; -aXV}ZY"
int b = temp[r]; ;q59Cr75
for (i = l, j = r, k = l; k <= r; k++) { mM&H;W
if (a < b) { 8S&`
data[k] = temp[i++]; JIQS'r
a = temp; FD,M.kbg
} else { /k l0(='
data[k] = temp[j--]; x?VX,9;j
b = temp[j]; &S]\)&Yt
} -6aGcPq
} 5a&[NN
} 25o + ?Y<
^D ;X
/** o'?Y0Wt
* @param data 7_?:R2]n
* @param l HFB2ep7N
* @param i OIe {Sx{y
*/ )UO:J7K
private void insertSort(int[] data, int start, int len) { ==l p\
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); YR=<xn;m.
} cL7je
} p9y "0A|
} {|O8)bW'
} YO|Kc {j2e
% Lhpj[C
堆排序： r*OSEzGUz
eh&?BP?
package org.rut.util.algorithm.support; mTwz&N\
%e+hM $Q
import org.rut.util.algorithm.SortUtil; ~6Vs>E4G
b`usRoD{+
/** g>CF|Wj
* @author treeroot i-vhX4:bd
* @since 2006-2-2 x~?,Wv|cm
* @version 1.0 x@;XyQq
*/ =\eM -"r
public class HeapSort implements SortUtil.Sort{ EgFV
S`)KC-
/* (non-Javadoc) MMN2XxS
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) bW7tJ
*/ v[q2OWcL
public void sort(int[] data) { ;oH17
MaxHeap h=new MaxHeap(); }3!83~Qbx
h.init(data); snK$? 9vh
for(int i=0;i h.remove(); Zm>Q-7r9
System.arraycopy(h.queue,1,data,0,data.length); 4/&Us
} ><mZOTn e;
TxoMCN?7c
private static class MaxHeap{ .9#4qoM'
)O#]Wvr
void init(int[] data){ 4L85~l
this.queue=new int[data.length+1]; mVcpYyD|k
for(int i=0;i queue[++size]=data; 5wmH3g#0
fixUp(size); S#8wnHq
} Xai ,
} CS)&A4`8
/JaH
private int size=0; %M2.h;9]*\
2l}FOdq
private int[] queue; v7&e,:r2E@
|"8Az0[!
public int get() { $W<H[k&(B
return queue[1]; j7K9T
} {a.{x+!5I-
0}2Uj>!i
public void remove() { LyH8T'C~
SortUtil.swap(queue,1,size--); p%EU,:I6
fixDown(1); 6a[D]46y,2
} VO] Jvf
file://fixdown Q^$IlzG7i
private void fixDown(int k) { y44FejH(v
int j; RIJ+]uir4
while ((j = k << 1) <= size) { $v#Q'?jE
if (j < size %26amp;%26amp; queue[j] j++; JR|yg=E
if (queue[k]>queue[j]) file://不用交换 D|/Azy.[
break; A)Wp W M
SortUtil.swap(queue,j,k); O`~G'l&@T
k = j; )HNbWGu
} 5V!L~#
} S}gUz9ks
private void fixUp(int k) { mf=,6fx28
while (k > 1) { =K I4
int j = k >> 1; RXh0hD
if (queue[j]>queue[k]) kbJ/7
break; mq`N&ABO!K
SortUtil.swap(queue,j,k); v%n'_2J =^
k = j; M`Jj!
} SL" ;\[uI
} -|B?pR
gRIRc4p
} izsAn"v
M7^PWC
} [X0Wfb}{
JM!rop^
SortUtil： 3P3x^NI
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package org.rut.util.algorithm; q{@j$fMt0
%Js3Y9AL C
import org.rut.util.algorithm.support.BubbleSort; dRTtDH"%
import org.rut.util.algorithm.support.HeapSort; 767xCP
import org.rut.util.algorithm.support.ImprovedMergeSort; z)xGZ*{=
import org.rut.util.algorithm.support.ImprovedQuickSort; H$au02dpU
import org.rut.util.algorithm.support.InsertSort; ks<gSCB
import org.rut.util.algorithm.support.MergeSort; 4SCb9|/Q
import org.rut.util.algorithm.support.QuickSort; yS p]+
import org.rut.util.algorithm.support.SelectionSort; .",E}3zn
import org.rut.util.algorithm.support.ShellSort; an={h,
1v!Xx+}
/** +6@".<
* @author treeroot I~y[8
* @since 2006-2-2 3C 84b/A
* @version 1.0 ${0+LhST
*/ k<wX??'
public class SortUtil { vNlYk
public final static int INSERT = 1; Iz,a Hrq
public final static int BUBBLE = 2; $]|fjB#D
public final static int SELECTION = 3; !31v@v:)
public final static int SHELL = 4; H>AQlO+J
public final static int QUICK = 5; CT+pkNC
public final static int IMPROVED_QUICK = 6; jJdw\`
public final static int MERGE = 7; 7].tt
public final static int IMPROVED_MERGE = 8; a97A{7I&
public final static int HEAP = 9; [_*%
YqX/7b+
public static void sort(int[] data) { VFz(U)._
sort(data, IMPROVED_QUICK); 2#~5[PtP^
} KGdL1~
private static String[] name={ @;2,TY>Di
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" 8`XpcK-0
}; zRN_`U
0^nnR7
private static Sort[] impl=new Sort[]{ Z7% |'E R
new InsertSort(), ~F~g$E2 }
new BubbleSort(), D@*<p h=
new SelectionSort(), ba& \~_4
new ShellSort(), pE@Q (9`b{
new QuickSort(), F?&n5R.
new ImprovedQuickSort(), b7Jk{x #u
new MergeSort(), qFp }+s
new ImprovedMergeSort(), (|L0s)
new HeapSort() fC+<n{"C
}; m-S4"!bl
eE5U|y)_
public static String toString(int algorithm){ }eb}oK
return name[algorithm-1]; z40uY]Ck
} +168!Jw;
W(a31d
public static void sort(int[] data, int algorithm) { `VY -3
impl[algorithm-1].sort(data); ?RJ )u
} pt<!b0G
&Q 7Q1`S
public static interface Sort { +pp|Qgr 3
public void sort(int[] data); =UYZ){rt9E
} ?ORG<11a
dPgN*Bdv
public static void swap(int[] data, int i, int j) { Jj4!O3\I
int temp = data; +#7e?B
data = data[j]; W- 5Z"m1I
data[j] = temp; O`1_eK~1<
} URS6 LM
} H4p N+