[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; Nl[&rZ-&
} S3/%;=|
int i1=l; 1J0gjO)AZ
int i2=mid+1; /?r A|
for(int cur=l;cur<=r;cur++){ <Q(E {c3"
if(i1==mid+1) Q>D//_TF
data[cur]=temp[i2++]; >SQzE
else if(i2>r) "a].v 8l!
data[cur]=temp[i1++]; N ;=zo-8
else if(temp[i1] data[cur]=temp[i1++]; Y_Fn)(
else 6 eryf?
data[cur]=temp[i2++]; PwW$=M{\.
} Xk.OyQ@
} K ,NmDc^
8Azh&c
} ,r*Kxy
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改进后的归并排序: sJx_X8
fD@d.8nXd
package org.rut.util.algorithm.support; F(n<:TvlK
Yw#fQFm
import org.rut.util.algorithm.SortUtil; 9vP;i= fr
7)QZ<fme
/** Xuu&`U~%
* @author treeroot ..5~x~O
* @since 2006-2-2 Hk;;+'-
* @version 1.0 W6T4Zsg
*/ Jy/< {7j
public class ImprovedMergeSort implements SortUtil.Sort { lv=q( &
b5H}0<
private static final int THRESHOLD = 10; {Z k^J
7YD+zd:
/* FWJ**J
* (non-Javadoc) 4_5f4%S
* HSysME1X:/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) tkZUjQIX
*/ s8&q8r7%
public void sort(int[] data) { ~2\Sn-`
int[] temp=new int[data.length]; 8<"g&+T
mergeSort(data,temp,0,data.length-1); ZeuL*c \
} -_nQn
F/ZFO5C%
private void mergeSort(int[] data, int[] temp, int l, int r) { |P]W#~Y-
int i, j, k; }O7sP^
int mid = (l + r) / 2; )Xg5=zn$
if (l == r) UH-873AK
return; rmzzbLTu
if ((mid - l) >= THRESHOLD) H2%Qu<Kg2
mergeSort(data, temp, l, mid); (9RfsV4^
else jz_Y|"{`v
insertSort(data, l, mid - l + 1); =S{OzF
if ((r - mid) > THRESHOLD) :+DrV\)
mergeSort(data, temp, mid + 1, r); SI~jM:S}
else jbipNgxkr
insertSort(data, mid + 1, r - mid); vN^.MR+<
pk9Ics;y
for (i = l; i <= mid; i++) { KGM__ZO.
temp = data; N<i5X.X
} @\w}p E
for (j = 1; j <= r - mid; j++) { {)"[_<
temp[r - j + 1] = data[j + mid]; V3ozaVk;
} ]O@iT= *3
int a = temp[l]; I3.. Yk%7
int b = temp[r]; }},0#Ap
for (i = l, j = r, k = l; k <= r; k++) { BJwuN
if (a < b) { F8Ety^9>9
data[k] = temp[i++]; "6\5eFN;
a = temp; z.8nYL5^}
} else { l+@;f(8}
data[k] = temp[j--]; iOg4(SPci
b = temp[j]; ]uox ^HC
} pZ'q_Oux
} \"(?k>]E
} ,i6E L
uQ-GJI^t
/** =( |%%,3
* @param data }qso} WI
* @param l ]Z5m_-I
* @param i R?iCJ5m
*/ Qz(2Iu{E]
private void insertSort(int[] data, int start, int len) { +Mq\3
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); P4Pc;8T@!
} N\*oL*[j
} <b H*f w
} ,Tr&`2w
} 3`yO&upk
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堆排序： xH\\#4/
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package org.rut.util.algorithm.support; 3GF67]
2>9\o]ac4
import org.rut.util.algorithm.SortUtil; F}So=Jz9h
]6B9\C.2-_
/** b_RO%L:"yL
* @author treeroot `B@eeXa;u
* @since 2006-2-2 V?S}%-a
* @version 1.0 je^VJ&ac
*/ syBpF:`-W
public class HeapSort implements SortUtil.Sort{ 1<'z)r4
D/Ki^E
/* (non-Javadoc) /al56n
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) kMCP .D45;
*/ :Q DkaA
public void sort(int[] data) { AuQ|CXG-\
MaxHeap h=new MaxHeap(); 4Y?2u
h.init(data); 5kw K%
for(int i=0;i h.remove(); B{&W|z{$
System.arraycopy(h.queue,1,data,0,data.length); SX"|~Pi(
} `.J)Z=o
,5 ka{Q`K
private static class MaxHeap{ ((A@VcX
x t-s"A
void init(int[] data){ pRV.\*:c
this.queue=new int[data.length+1]; K9EHT-
for(int i=0;i queue[++size]=data; VQpt1cK*
fixUp(size); w>j5oz}
} CWkWW/ZI
} "}Om0rB}1
tcj"rV{G
private int size=0; =h4uN,
>u> E !5O
private int[] queue; b\ED<'
:bct+J}l~
public int get() { O80Z7
return queue[1]; T+Re1sPr?
} Oh1U=V2~
g/.FJ-I*
public void remove() { M}o.= Iqa
SortUtil.swap(queue,1,size--); zNX=V!$
fixDown(1); {mD0ug
} Db Qp(W0
file://fixdown 2x<BU3
private void fixDown(int k) { 'S6zkwC]
int j; EM@|^47$
while ((j = k << 1) <= size) { O~qRHYv
if (j < size %26amp;%26amp; queue[j] j++; =? !FO'zt"
if (queue[k]>queue[j]) file://不用交换 (E0WZ$f}
break; )q_,V"
SortUtil.swap(queue,j,k); .\oW@2,RA9
k = j; V]--d33/a
} \2 DED
} Ne+Rs+~4
private void fixUp(int k) { R?)Yh.vi=t
while (k > 1) { 5/P. 4<c7
int j = k >> 1; X'$H'[8;C
if (queue[j]>queue[k]) |u%;"N'p)
break; 1R@G7m
SortUtil.swap(queue,j,k); 9ad)=3A&L
k = j; 1oO(;--u_
} ;U4O`pZ
} uxxk&+M
[,Rc&7p~R
} >oq\`E
h<?Px"& J
} k:?)0Uh%^
QaO9-:]eN
SortUtil： t+A*Ws*o
u|wl;+.
package org.rut.util.algorithm; =M?+KbTJ3
}R+#>P
import org.rut.util.algorithm.support.BubbleSort; 00;SK!+$
import org.rut.util.algorithm.support.HeapSort; ef*Z;HI0
import org.rut.util.algorithm.support.ImprovedMergeSort; Y`22DFO
import org.rut.util.algorithm.support.ImprovedQuickSort; ;v]C8}L^
import org.rut.util.algorithm.support.InsertSort; ROTKK8:+:
import org.rut.util.algorithm.support.MergeSort; FFZ?-sE
import org.rut.util.algorithm.support.QuickSort; *^@b0f~vj
import org.rut.util.algorithm.support.SelectionSort; >uZc#Zt
import org.rut.util.algorithm.support.ShellSort; k 76<CX
CP9Q|'oJ
/** u^SInanw
* @author treeroot C1f$^N
* @since 2006-2-2 W[I[Xg&
* @version 1.0 Q3i\`-kbb
*/ R(0[bMr3Q
public class SortUtil { *P\lzM
public final static int INSERT = 1; Zq33R`
public final static int BUBBLE = 2; w|G7h=
public final static int SELECTION = 3; fPTLPcPP
public final static int SHELL = 4; TqN@l\
public final static int QUICK = 5; v @M6D}
public final static int IMPROVED_QUICK = 6; }~LGq.H
public final static int MERGE = 7; On O_7'4 t
public final static int IMPROVED_MERGE = 8; -,*m\Fe}
public final static int HEAP = 9; a=ZVKb
=k d-rIBc
public static void sort(int[] data) { pFd{Tdh
sort(data, IMPROVED_QUICK); S^~"#
} q<.k:v&
private static String[] name={ U^[AW$WzU
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" i;~.kgtq4
}; yD\Kn{
t|V5[n!
private static Sort[] impl=new Sort[]{ j8Q_s/n
new InsertSort(), ^vh!1"T
new BubbleSort(), gcwJ{&
new SelectionSort(), Y/UvNb<lK
new ShellSort(), 8)iI=,T*
new QuickSort(), zytW3sTZA
new ImprovedQuickSort(), GBZu<t/
new MergeSort(), m==DBh
new ImprovedMergeSort(), z+oy#p6+F.
new HeapSort() hB<(~L?A]
}; ghW`xm87
b"o\-iUioe
public static String toString(int algorithm){ <J~6Q
return name[algorithm-1]; XjzGtZ#6
} g3'dkS!
PfYeV/M|
public static void sort(int[] data, int algorithm) { eI`%J3BxR
impl[algorithm-1].sort(data); (5`(H.(
} A]QGaWK
;XNC+mPK
public static interface Sort { KRm)|bgE
public void sort(int[] data); ~)pZ5%C
} |4BD
oJ5n*[qUI
public static void swap(int[] data, int i, int j) { '_DB0_Dp
int temp = data; GZ5DI+3
data = data[j]; 4VF]tX?o
data[j] = temp; ci?\W6
} mK7SEH;
} Yt_tAm