[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; m3 W
} 5'[b:YC
int i1=l; #qdfr3
int i2=mid+1; CR'1,
for(int cur=l;cur<=r;cur++){ j q1|`:
if(i1==mid+1) >Y"Ru#Ju9
data[cur]=temp[i2++]; Dt*/tVF
else if(i2>r) 3etW4
data[cur]=temp[i1++]; GC^>oF
else if(temp[i1] data[cur]=temp[i1++]; <Is~DjIav
else tx||<8
data[cur]=temp[i2++]; !$8 e6
} ps3jw*QZ{5
} 8iUj9r_
#Q61c
} 'P3jUc)
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改进后的归并排序: }w/6"MJ[n
4,qhWe`/
package org.rut.util.algorithm.support; jq12,R2+)
JY6^pC}*
import org.rut.util.algorithm.SortUtil; :c`Gh< u
vAjvW&'g
/** (E]q>'X
* @author treeroot |tuh/e@dx
* @since 2006-2-2 |'N)HH>;
* @version 1.0 [^2c9K^NK
*/ 0hM!#BU5K
public class ImprovedMergeSort implements SortUtil.Sort { R>n=_C
L/2,r*LNx$
private static final int THRESHOLD = 10; Ipyr+7/zJ
m>ApN@n
/* gX!-s*{E
* (non-Javadoc) \d}>@@U&
* .h[yw$z6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LF\HmKM,
*/ bOS; 1~~
public void sort(int[] data) { /K\]zPq
int[] temp=new int[data.length]; EK$3T5e
mergeSort(data,temp,0,data.length-1); nv/'C=+L
} $ucA.9pJ
M A
private void mergeSort(int[] data, int[] temp, int l, int r) { h3t);}Y}D9
int i, j, k; h0)Dj(C
int mid = (l + r) / 2; k}FmdaPI'
if (l == r) I::|d,bR!
return; |!E: [UH
if ((mid - l) >= THRESHOLD) Dg o-Os@
mergeSort(data, temp, l, mid); TNkvdE-S
else fuF!3Q
insertSort(data, l, mid - l + 1); 3 G_0DS
if ((r - mid) > THRESHOLD) 6w)a.^yx7
mergeSort(data, temp, mid + 1, r); xSy`VuSl
else 9vI<\ Xa
insertSort(data, mid + 1, r - mid); T1=T
ZfP$6%;_
for (i = l; i <= mid; i++) { G_/DzJBF
temp = data; z^^)n
} N|\Q:<!2_w
for (j = 1; j <= r - mid; j++) { yr/G1?k%ML
temp[r - j + 1] = data[j + mid]; S^T ><C
} ]-"G:r
int a = temp[l]; f O,5 u;
int b = temp[r]; 2rPmu
for (i = l, j = r, k = l; k <= r; k++) { H<Ik.]m
if (a < b) { M)1Y7?r]
data[k] = temp[i++]; }WDzzjDR+
a = temp; k{ ~0BK
} else { TP{2q51yM
data[k] = temp[j--]; B"?ivxM:U
b = temp[j]; cK.z&y0]
} h yK&)y?~
} f@Yo]FU
} ?!HU$>
O_\%8*;
/** !QSj*)V#
* @param data ^xm%~
* @param l Mqv[7.|
* @param i `i<omZ[aT
*/ Fj4>)!^kM
private void insertSort(int[] data, int start, int len) { *WaqNMD[%
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); N>xdX5
} gE: ?C2
} ZXl_cq2r
} z"P/Geb:O
} `3yK<-
Z@,[a
堆排序： d$hBgJe>N
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package org.rut.util.algorithm.support; ( 4(,"
"fu:hHq
import org.rut.util.algorithm.SortUtil; fPPC`d&Q3
ir|c<~_=
/** e2^TQv2(=e
* @author treeroot uH]oHh!}j
* @since 2006-2-2 c{ ([U
* @version 1.0 pZz\o
*/ [ylRq7^e
public class HeapSort implements SortUtil.Sort{ 7YFEyX10d
\{ve6`7Rn
/* (non-Javadoc) #MFIsx)r
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =;"=o5g_
*/ 8W Etm}
public void sort(int[] data) { 10_#Z~aU
MaxHeap h=new MaxHeap(); 7-gT:
h.init(data); s }Ql9
for(int i=0;i h.remove(); YD;G+"n?T
System.arraycopy(h.queue,1,data,0,data.length); \@[,UZ
} BU#3fPl
3$wK*xK
private static class MaxHeap{ CEW1T_1U<\
p(6 sN=
void init(int[] data){ P; h8
this.queue=new int[data.length+1]; ?N^1v&Q
for(int i=0;i queue[++size]=data; ?4^ 0xGyE
fixUp(size); V503
} Y (pUd3y
} T+e*'<!O
.cm2L,1h
private int size=0; "VDMO^
1YK(oRSDn
private int[] queue; yzT4D>1,
XBoq/kbw!
public int get() { |az2vD6P
return queue[1]; )k;;O7Ck
} m*jTvn
!Au#j^5K-o
public void remove() { Q(36RX%@
SortUtil.swap(queue,1,size--); V';l H2
fixDown(1); F$bV}>-1k
} 7[PEiAI
file://fixdown A=3L_ #nO
private void fixDown(int k) { :bm%f%gg
int j; vA}_x7}n(
while ((j = k << 1) <= size) { l0C`teO
if (j < size %26amp;%26amp; queue[j] j++; SL-;h#-y 4
if (queue[k]>queue[j]) file://不用交换 PD&gC88
break; hHHQmK<r
SortUtil.swap(queue,j,k); axpZ`BUc
k = j; )+R n[MMp
} @S=9@3m{w;
} K`2(Q
private void fixUp(int k) { yM~bUmSg
while (k > 1) { 7i!VgV
int j = k >> 1; ^qnmKA>"F
if (queue[j]>queue[k]) m7DKC,
break; J\P6
SortUtil.swap(queue,j,k); *MB>,HU
k = j; g(Q1d-L4e
} vd)zvI
} Q;J( 5;
?xrOhA9
} 7B)1U_L0H
d$jwh(Ivs
} }opw_h+/F
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SortUtil： fbU3-L?
lLDZ#'&An
package org.rut.util.algorithm; ] |nW
R3;%eyu
import org.rut.util.algorithm.support.BubbleSort; lPI~5N8
import org.rut.util.algorithm.support.HeapSort; s M*ay,v;
import org.rut.util.algorithm.support.ImprovedMergeSort; 4M|uT 9-
import org.rut.util.algorithm.support.ImprovedQuickSort; Z`u$#<ukX
import org.rut.util.algorithm.support.InsertSort; r*]pL<
import org.rut.util.algorithm.support.MergeSort; VX&PkGi?o
import org.rut.util.algorithm.support.QuickSort; ;0Pv49q
import org.rut.util.algorithm.support.SelectionSort; nQoQNB
import org.rut.util.algorithm.support.ShellSort; J|].h
?*%_:fB
/** |/vJ+aKq
* @author treeroot ykx^RmD`~
* @since 2006-2-2 marZA'u%B1
* @version 1.0 Z Cjw)To(
*/ U2A 82;Z
public class SortUtil { L-!1ybB^
public final static int INSERT = 1; S YDE`-
public final static int BUBBLE = 2; r:;.?f@
public final static int SELECTION = 3; F,{mF2U*$
public final static int SHELL = 4; o$buoGSPc
public final static int QUICK = 5; msM1K1er
public final static int IMPROVED_QUICK = 6; |PlNVd2
public final static int MERGE = 7; XIbZ_G^ +D
public final static int IMPROVED_MERGE = 8; -^lc-$0
public final static int HEAP = 9; @(~:JP?KNC
dWPQp*f2
public static void sort(int[] data) { `r-jWK\
sort(data, IMPROVED_QUICK); i*Ldec^
} k%sH09
private static String[] name={ 2h'Wu qO
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" M{Z ;7n'
}; m$kQbPlatN
lOk8VlH<h
private static Sort[] impl=new Sort[]{ 9MYk5q.X:
new InsertSort(), yjg&/6
new BubbleSort(), 6FQi=}O1
new SelectionSort(), 8.#{J&h
new ShellSort(), iBd6&?E?<
new QuickSort(), %^pi
new ImprovedQuickSort(), XS[L-NHG
new MergeSort(), J6AHc"k.
new ImprovedMergeSort(), U8w_C\Q
new HeapSort() uI)twry]@
}; RI0^#S_{
B-R#?Xn:!I
public static String toString(int algorithm){ sa(.Anmlj
return name[algorithm-1]; `;E/\eG"
} M .b8 -`V
4 "HX1qP
public static void sort(int[] data, int algorithm) { 1!~cPD'F
impl[algorithm-1].sort(data); Y~-y\l;Tr
} Ve3z5d:^
UtQey ;w
public static interface Sort { -f)fiQ-<
public void sort(int[] data); FT@uZWgQ=
} M 9t7y
x8PT+KC
public static void swap(int[] data, int i, int j) { |)29"_Kk5
int temp = data; hTr5Q33y>
data = data[j]; lUm(iYv;H
data[j] = temp; VN0We<\Z
} CwA_jOp
} ViPC Yt`of