[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; ~t}:vGDj
} ~ce.&C7cR
int i1=l; p|((r?{
int i2=mid+1; YmwVa s
for(int cur=l;cur<=r;cur++){ vfjIpg%i
if(i1==mid+1) p+t8*lkq
data[cur]=temp[i2++]; {T IGPK
else if(i2>r) ]-6 G'i?
data[cur]=temp[i1++]; Li'T{0)1)
else if(temp[i1] data[cur]=temp[i1++]; f 6q@
else \u*,~J)z
data[cur]=temp[i2++]; !y),| #7P
} %:y-"m1\u$
} YMWy5 \
h{m]n!
} pM=vW{"I/
2::T,Z
改进后的归并排序: @iaN@`5I6s
N>~*Jp2;
package org.rut.util.algorithm.support; fSTEZH
nuQ"\ G
import org.rut.util.algorithm.SortUtil; KDhHp^IXQ
=19]a
/** l}wBthwCc
* @author treeroot e7;]+pN]J
* @since 2006-2-2 sJD"u4#y
* @version 1.0 giTlXz3D9
*/ ABSeX
public class ImprovedMergeSort implements SortUtil.Sort { &M2x`
RBb@@k[v
private static final int THRESHOLD = 10; saZ;ixV
A@#dv2JzP
/* ?G{fF H
* (non-Javadoc) b,'./{c0
* Dn@ n:m
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) F-X>|oK>z
*/ OS,$}I[`8
public void sort(int[] data) { H!A^ MI
int[] temp=new int[data.length]; V>%%2"&C
mergeSort(data,temp,0,data.length-1); "Vh(%N`6
} LU]~d<i99
qg|+BIiUz
private void mergeSort(int[] data, int[] temp, int l, int r) { vi2xonq^
int i, j, k; =SdWU}xn2
int mid = (l + r) / 2; XyIw5 9
if (l == r) i^> RjR
return; *qqFIp^
if ((mid - l) >= THRESHOLD) NubD2
mergeSort(data, temp, l, mid); :DD4BY
else [L275]4n!]
insertSort(data, l, mid - l + 1); $p0s
if ((r - mid) > THRESHOLD) NUU}8a(K
mergeSort(data, temp, mid + 1, r); MhsG9q_%
else 3aOFpCs|#
insertSort(data, mid + 1, r - mid); oM VJ+#[x
=FKB)#N
for (i = l; i <= mid; i++) { -(2-zznZ
temp = data; AE$)RhY`
} upJishy&I
for (j = 1; j <= r - mid; j++) { [ ~E}x
temp[r - j + 1] = data[j + mid]; P-mrH
} i||YD-hkK
int a = temp[l]; {Xp.}c
int b = temp[r]; ?-VN+ d7
for (i = l, j = r, k = l; k <= r; k++) { &a:aW;^A7
if (a < b) { N+tS:$V
data[k] = temp[i++]; {/Cd^CK
a = temp; ~)Z`Q
} else { g %Am[fb
data[k] = temp[j--]; M}vPWWcl
b = temp[j]; 4 A<c@g2
} CuGk?i
} zknD(%a
} ?BRL;(x
u>eu47"n!
/** +!<`$+W
* @param data W)_B(;$]
* @param l k9,"`dk@
* @param i Y}6)jzBV
*/ UvI!e4_
private void insertSort(int[] data, int start, int len) { pI!55w|
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); ^>"?!lv
} :b=0_<G
} bcZonS
} IIPf5 Z}A
} Ob+&!XTp?0
yx-"YV}5
堆排序： -"<f(
V1fPH;
package org.rut.util.algorithm.support; B8&@Qc@~
!d^`YEfE
import org.rut.util.algorithm.SortUtil; ~!;3W!@(E
S6QG:|#P
/** mvw:E_
* @author treeroot joG>=o
* @since 2006-2-2 NplSkv
* @version 1.0 &-zI7@!
*/ U}7[8&k1
public class HeapSort implements SortUtil.Sort{ pGFocw
t0q@] 0B5
/* (non-Javadoc) 7^L&YVW
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) S]N4o'K}q
*/ "f3>20}
public void sort(int[] data) { H1]\B:
MaxHeap h=new MaxHeap(); $Yka\tS'
h.init(data); 87Kx7CKF"
for(int i=0;i h.remove(); m"DMa
System.arraycopy(h.queue,1,data,0,data.length); wnX6XyUH
} _e'mG'P(
^#o.WL%4/B
private static class MaxHeap{ 9Dl \SF[
e=_hfOUC
void init(int[] data){ %9lxE[/
this.queue=new int[data.length+1]; l0_V-|x
for(int i=0;i queue[++size]=data; SS`C0&I@p
fixUp(size); nAzr!$qbNv
} by<2hLB9Q
} (tgaH,G
hqBRh+[
private int size=0; 8n)Q^z+ K
J3]m*i5A
private int[] queue; 4Y!v$r
,&-[$,
public int get() { UQFuEI<1-
return queue[1]; >W<5$.G
} J0 P
PG!vn@b6
public void remove() { _X[c19q
SortUtil.swap(queue,1,size--); J\V(MN,
fixDown(1); #5D+XBT
} H[r0jREK
file://fixdown lg1D>=(mY
private void fixDown(int k) { f"Iyo:Wt
int j; 2?j1~]DvZ
while ((j = k << 1) <= size) { H/$q]i*#K
if (j < size %26amp;%26amp; queue[j] j++; *"ShE=\p
if (queue[k]>queue[j]) file://不用交换 0u_'(Z-^2
break; gUp0RPs
SortUtil.swap(queue,j,k); `Nn?G
k = j; 'UxA8i(
} 0"`skYJ@
} 7L*`nU|h
private void fixUp(int k) { 3fPv71NVtt
while (k > 1) { A=K1T]o
int j = k >> 1; wLbngO=VG
if (queue[j]>queue[k]) =Ug_1w
break; .p`'^$X^
SortUtil.swap(queue,j,k); q4{tH
k = j; Fn,|J[sC
} GLyh1qNX
} ]_?y[@ZP
m!_ghD{5h
} W=?87PkJu
keOW{:^i
} ;Y\,2b, xh
,whNh
SortUtil： mxGN[%ve
V*}zwms6
package org.rut.util.algorithm; m##=iB|;
9:o3JGHSc
import org.rut.util.algorithm.support.BubbleSort; B*IDx`^Y
import org.rut.util.algorithm.support.HeapSort; H[ q{R
import org.rut.util.algorithm.support.ImprovedMergeSort; ;^]A@WN6_
import org.rut.util.algorithm.support.ImprovedQuickSort; =HHg:"
import org.rut.util.algorithm.support.InsertSort; _=5ZB_I
import org.rut.util.algorithm.support.MergeSort; v%5(-
import org.rut.util.algorithm.support.QuickSort; (#]KjpIK
import org.rut.util.algorithm.support.SelectionSort; @{uc
import org.rut.util.algorithm.support.ShellSort; #EUgb7
{9 O`/|
/** G.8b\E~
* @author treeroot qS al~
* @since 2006-2-2 )v~]lk,o
* @version 1.0 -e>)yM `i
*/ Z"Oa5V6[A
public class SortUtil { ?W_U{=anl
public final static int INSERT = 1; @g~sgE}#
public final static int BUBBLE = 2; aehMLl9cl
public final static int SELECTION = 3; `'WLGQG
public final static int SHELL = 4; #9OP.4
public final static int QUICK = 5; gN~y6c:N
public final static int IMPROVED_QUICK = 6; H%]ch6C
public final static int MERGE = 7; n~j[Pw
public final static int IMPROVED_MERGE = 8; Sj?sw]3
public final static int HEAP = 9; R:?vY!
<>s\tJ
public static void sort(int[] data) { |m- `, we
sort(data, IMPROVED_QUICK); 1#"Q' ,7
} 4a!7|}W
private static String[] name={ (+dRD]|T
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" vq1&8=
}; ,np`:fBMy
;0}2@Q2@ZK
private static Sort[] impl=new Sort[]{ mC92J@m/L!
new InsertSort(), -QDgr`%5
new BubbleSort(), 6/ipdi[ _
new SelectionSort(), \DK*> k
new ShellSort(), &,]+>
new QuickSort(), @~3c"q;i7
new ImprovedQuickSort(), dRm'$ G9
new MergeSort(), j*d~h$[k
new ImprovedMergeSort(), ^~ $&
new HeapSort() "|`9{/]
}; X>7]g670@
\*aLyyy3
public static String toString(int algorithm){ <|3v@
return name[algorithm-1]; /g'-*:a
} XWpnZFjE
^1=|(Z/
public static void sort(int[] data, int algorithm) { +Q31K7Gr
impl[algorithm-1].sort(data); vfJk? (
} s$x] fO
X@U1Ri
public static interface Sort { CL :M>(
public void sort(int[] data); Ag0_^
} 8p{
Gcz@ze
public static void swap(int[] data, int i, int j) { z/k~+-6O
int temp = data; &\|<3sd(
data = data[j]; ok%!o+nk.
data[j] = temp; ;<@6f@
} rq["O/2
} lFGxW 5