[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; ![MtJo5
} .G"T;w6d
int i1=l; f2v~: u
int i2=mid+1; (#>Q#Izr
for(int cur=l;cur<=r;cur++){ ,jD-fL/:
if(i1==mid+1) .f!:@fX>=
data[cur]=temp[i2++]; 47A[-&y*X
else if(i2>r) j)juvat
data[cur]=temp[i1++]; 57;( P
else if(temp[i1] data[cur]=temp[i1++]; s!Iinc^p
else h///
data[cur]=temp[i2++]; Mt%Q5^
} ft iAty0n
} ]I;owk,
V|{~9^
} gI@nE:(m
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改进后的归并排序: .v9i|E=<~
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package org.rut.util.algorithm.support; ?,[$8V
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import org.rut.util.algorithm.SortUtil; \\d8ulu
!MmbwB'
/** A-$C6q
* @author treeroot pF}E`U=Z
* @since 2006-2-2 N~S#(.}[
* @version 1.0 kY'C'9p
*/ hl DU.k
public class ImprovedMergeSort implements SortUtil.Sort { F#qc#s
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private static final int THRESHOLD = 10; *0r!eD
HPo><u
/* /^WawH6)6
* (non-Javadoc) c]ga)A(
* ww'B!Ml>F
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,I,Zl.5
*/ [g+WL\1
public void sort(int[] data) { G,(Xz"`,
int[] temp=new int[data.length]; i"E_nN"V
mergeSort(data,temp,0,data.length-1); V_|HzYJJ5
} (+u&b< <6N
KQ(S\
private void mergeSort(int[] data, int[] temp, int l, int r) { '}F9f?
int i, j, k; @]EdUzzKq
int mid = (l + r) / 2; @ W q8AFo
if (l == r) @9k/od@mW
return; \Z~ <jv
if ((mid - l) >= THRESHOLD) l9H-N*Wx
mergeSort(data, temp, l, mid); vJ&35nF&
else hIa,PZ/Q
insertSort(data, l, mid - l + 1); H3Zt3l1u+
if ((r - mid) > THRESHOLD) 1Eryw~,,9i
mergeSort(data, temp, mid + 1, r); I6S>*V
else VHL[Y
insertSort(data, mid + 1, r - mid); q'X#F8v
RGY#0.Z}
for (i = l; i <= mid; i++) { 5\}QOL
temp = data; (F:|tiV+
} !wro7ilMB
for (j = 1; j <= r - mid; j++) { jd`]]FAww
temp[r - j + 1] = data[j + mid]; NG4@L1f%
} SF[Z]|0gs
int a = temp[l]; ye| 2gH
int b = temp[r]; =Prz|
for (i = l, j = r, k = l; k <= r; k++) { 5xH*&GpL7
if (a < b) { i2LN`5k
data[k] = temp[i++]; 5iGz*_ m
a = temp; PK_2
} else { Y)M-?|4
data[k] = temp[j--]; Ow-;WO_HQ
b = temp[j]; wMM1Q/-#
} /5\{(=0
} oL9ELtb]s
} Kf6D$}
JNu+e#.Y
/** dcE(uf
* @param data `_J>R
* @param l q1/mp){
* @param i ;Z,l};b
*/ MA7&fNjB
private void insertSort(int[] data, int start, int len) { #vPk XcP
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); grJ(z)c
} w&&)v~Y_
} .O{_^~w_q
} mx2Ov u
} 7~H$p X
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堆排序： QCfR2Nn}
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package org.rut.util.algorithm.support; gO]8hLT
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import org.rut.util.algorithm.SortUtil; +^4HCyW
W9A F}
/** >R\!Qk
* @author treeroot 6%&w\<(SG
* @since 2006-2-2 8%b-.O:_$
* @version 1.0 i6^-fl
*/ o;pJjC]
public class HeapSort implements SortUtil.Sort{ hCj8y.X|E(
mWVq>~
/* (non-Javadoc) )Qo^Mz
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }9+Vf'u|l
*/ ,Fu[o6x<^
public void sort(int[] data) { w4UJXc
MaxHeap h=new MaxHeap(); !nF.whq
h.init(data); j7VaaA
for(int i=0;i h.remove(); (T.g""N~`
System.arraycopy(h.queue,1,data,0,data.length); ^3Z~RK\}
} [?)He} _L
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private static class MaxHeap{ *o=( w5
M7(]NQ\TQ
void init(int[] data){ Lcs?2c:%
this.queue=new int[data.length+1]; cvV8;
for(int i=0;i queue[++size]=data; d ?,wEfwp
fixUp(size); m khp@^5
} ,u.A[{@py
} !\q'{x5C
Acb %)Y
private int size=0; OX.g~M ig|
4uv*F:eo
private int[] queue; 74KR.ABd
Z%VgAV>>
public int get() { {XLRrU!*
return queue[1]; :)k|Onz
} rX|{nb
Ys@\~?ym+
public void remove() { e~$aJO@B.R
SortUtil.swap(queue,1,size--); ban;HGGNG{
fixDown(1); 0-Wv$o[
} v&"sTcS|
file://fixdown tSunO-\y
private void fixDown(int k) { V:1_k"zQ
int j; :U'Oc3l#Y
while ((j = k << 1) <= size) { -L2%,.E>4
if (j < size %26amp;%26amp; queue[j] j++; zY&/lWW._
if (queue[k]>queue[j]) file://不用交换 I -V=Z:
break; z*/}rk4i
SortUtil.swap(queue,j,k); f5#VU7=1F2
k = j; %){)/~e&
} t\-;n:p-
} sTECNY=l
private void fixUp(int k) { EB5^eNdL
while (k > 1) { x<) T,c5Y
int j = k >> 1; ODPWFdRar
if (queue[j]>queue[k]) G5$YXNV
break; 5g phza
SortUtil.swap(queue,j,k); PtOYlZTe?
k = j; 5Ja[p~^L
} V}q=!zz
} ;QQ/bM&I
ujbJ&p
} k FE<M6a9@
o@r~KFIe
} u%nhQ%
$_ k:{?
SortUtil： WNiM&iU
W%K=N-kE_
package org.rut.util.algorithm; ?qczMck_
|Q#CQz
import org.rut.util.algorithm.support.BubbleSort; \l/<[ZZ
import org.rut.util.algorithm.support.HeapSort; +Pb@@C&
import org.rut.util.algorithm.support.ImprovedMergeSort; l gTw>r
import org.rut.util.algorithm.support.ImprovedQuickSort; n`|CDKb
import org.rut.util.algorithm.support.InsertSort; ?4lEHef
import org.rut.util.algorithm.support.MergeSort; bU_P@GKB
import org.rut.util.algorithm.support.QuickSort; x7c#kU2A&Z
import org.rut.util.algorithm.support.SelectionSort; #h2 qrX&+
import org.rut.util.algorithm.support.ShellSort; .&n;S';"
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/** =b#,OXQ
* @author treeroot [J43]
* @since 2006-2-2 Zex`n:Wl?j
* @version 1.0 Uy{ZK*c8i
*/ EZ)GW%Bm2
public class SortUtil { Ly`FU)
public final static int INSERT = 1; qUG)+~g`
public final static int BUBBLE = 2; Z(o]8*;Ai
public final static int SELECTION = 3; DM*u;t{i
public final static int SHELL = 4; a |0f B4G
public final static int QUICK = 5; \.{ZgL5"
public final static int IMPROVED_QUICK = 6; sm;\;MP*yH
public final static int MERGE = 7; #e$vv!&}
public final static int IMPROVED_MERGE = 8; *uvE`4V^Jg
public final static int HEAP = 9; ]0myoWpi3
4d $T6b
public static void sort(int[] data) { @s~*>k#"#
sort(data, IMPROVED_QUICK); v^1n.l %E
} 4XArpKA
private static String[] name={ u$y5?n|
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" lgh+\pj
}; 3b1%^@,ACy
ci{WyIh
private static Sort[] impl=new Sort[]{ xU$15|ny
new InsertSort(), '=>l& ;
new BubbleSort(), k\lU Q\/O5
new SelectionSort(), =42NQ{%@;
new ShellSort(), ?bl9e&/!
new QuickSort(), B3V+/o6
new ImprovedQuickSort(), _Wo(;'.
new MergeSort(), j9$kaEf
new ImprovedMergeSort(), 8jU6N*p/
new HeapSort() {$)pkhJ
}; %51HJB}C]
-v?)E S
public static String toString(int algorithm){ <~35tOpv
return name[algorithm-1]; )r:gDd#/X
} ?F@X>zR2
+We=- e7
public static void sort(int[] data, int algorithm) { +&8'@v$
impl[algorithm-1].sort(data); 1Et{lrgh f
} Xa/]} B
6YYDp&nqEj
public static interface Sort { aUEnQ%YU"
public void sort(int[] data); NC{8[*Kx5
} vK8!V7o~h%
6yXMre)YV
public static void swap(int[] data, int i, int j) { Mg=R**s1x%
int temp = data; f&`yiy_
data = data[j]; kDK0L3}nr]
data[j] = temp; $C9['GGR
} D 13bQ&\B-
} (t2vt[A6ph