[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; @7u0v
} [m -bV$-d
int i1=l; \GBuWY3B
int i2=mid+1; @L`jk+Y0vF
for(int cur=l;cur<=r;cur++){ K'xV;r7Nt
if(i1==mid+1) S@Y39
data[cur]=temp[i2++]; 9$Y=orpWxr
else if(i2>r) fOHxtHM
data[cur]=temp[i1++]; ~>G^=0LT
else if(temp[i1] data[cur]=temp[i1++]; pdMc}=K
else @d_M@\r=j
data[cur]=temp[i2++]; KXrjqqXs
} Y@v>FlqI{
} . me;.,$#
NRuNKl.v
} /}$+uBgJm
#G3<7PK
改进后的归并排序: b$7 +;I;
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package org.rut.util.algorithm.support; Smh,zCc>s
\*da6Am
import org.rut.util.algorithm.SortUtil; h;Qk@F
2!\DPX
/** 2eogY#
* @author treeroot K:M8h{Ua
* @since 2006-2-2 +t.b` U`-
* @version 1.0 AX INThJ
*/ :m;p:l|W
public class ImprovedMergeSort implements SortUtil.Sort { <q836]aaA
@W<m4fi
private static final int THRESHOLD = 10; wL1MENzp*z
@WhHUd4s
/* ,6/V"kqIP
* (non-Javadoc) f<_Cq<q"
* b>W%t
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) l{9Y
*/ \['Cj*ek
public void sort(int[] data) { `L zPotz
int[] temp=new int[data.length]; =I<R!ZSN
mergeSort(data,temp,0,data.length-1); }bDm@NU
} wkq 66?
m 5.Zu.
private void mergeSort(int[] data, int[] temp, int l, int r) { b>|6t~}M
int i, j, k; Xvv6~
int mid = (l + r) / 2; hxx.9x>ow
if (l == r) 6863xOv{T
return; EnR}IY&sI
if ((mid - l) >= THRESHOLD) u, ff>/1
mergeSort(data, temp, l, mid); pmM9,6P4@
else >z03{=sAN
insertSort(data, l, mid - l + 1); ]]mJ']l
if ((r - mid) > THRESHOLD) ]d]]'Hk
mergeSort(data, temp, mid + 1, r); dM5-;
else ,}PgOJZ
insertSort(data, mid + 1, r - mid); a#4?cEy
bOB\--:]
for (i = l; i <= mid; i++) { _#niyW+?~
temp = data; do%&m]#;
} IPk4 ;,
for (j = 1; j <= r - mid; j++) { .H|-_~Yx|
temp[r - j + 1] = data[j + mid]; *|0 -~u%q
} uZ5p#M_
int a = temp[l]; +z( Lr=G
int b = temp[r]; eDMO]5}Ht
for (i = l, j = r, k = l; k <= r; k++) { ]lbuy7xj63
if (a < b) { }6#
data[k] = temp[i++]; 1^}+=~
a = temp; g(052]
} else { f 2.HF@
data[k] = temp[j--]; \zkg
b = temp[j]; @- xjfC\d
} ^y::jK
} G2D$aSh
} ,hVli/
x4 yR8n(
/** pb}*\/s
* @param data &HW9Jn
* @param l O?2DQY?jT
* @param i +nL[MSw
*/ ![1rzQvGDb
private void insertSort(int[] data, int start, int len) { -~1~I e2
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); TxD#9]Q`
} 2 nCA<&
} 6'/ #+,d'
} D^O@'zP=At
} \85i+q:LuA
gJXaPJA{
堆排序： +rd+0 `}C
V&5wRz+`W
package org.rut.util.algorithm.support; = [E
oxs#866x
import org.rut.util.algorithm.SortUtil; ? k/`
@5FQX
/** A&VG~r$
* @author treeroot KPF1cJ2N
* @since 2006-2-2 w>gYx(8b
* @version 1.0 xpt:BBo
*/ Sc0w.5m6
public class HeapSort implements SortUtil.Sort{ (HVGlw'`
X8|,
/* (non-Javadoc) C_Dn{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;+%rw2Z,B
*/ ;TYBx24vD'
public void sort(int[] data) { Dtk=[;"k2a
MaxHeap h=new MaxHeap(); p+eh%2Jm
h.init(data); se)TzI^]b@
for(int i=0;i h.remove(); ep8
System.arraycopy(h.queue,1,data,0,data.length); 1#x0q:6
} Da|z"I x
mt .sucT
private static class MaxHeap{ }7Uoh(d
lN@o2QX
void init(int[] data){ ^c|/*u
this.queue=new int[data.length+1]; iTwm3V P
for(int i=0;i queue[++size]=data; ;pAK_>
fixUp(size); >7|VR:U?B
} Ac@VGT:9
} s[jTP(d)8
uT"rq:N
private int size=0; G\i9:7 `
9w"*y#_
private int[] queue; zPO9!?7|
V!Uc(
public int get() { TOt dUO
return queue[1]; & 21%zPm
} ZVBXx\{s
KO [Yi
public void remove() { ]gOy(\B
SortUtil.swap(queue,1,size--); COlqcq'qAu
fixDown(1); *@5@,=d
} 7#XzrT]
file://fixdown qGo.WZ$
private void fixDown(int k) { IxU/?Zm
int j; 0B2t"(&
while ((j = k << 1) <= size) { 4x34u}l
if (j < size %26amp;%26amp; queue[j] j++; %J(:ADu]
if (queue[k]>queue[j]) file://不用交换 I9Xuok!0>=
break; ye&;(30Oq
SortUtil.swap(queue,j,k); 9*gZ-#
k = j; RZLq]8pM
} 3fj4%P"
} vXs"Dst
private void fixUp(int k) { tmqOJ
while (k > 1) { ?s01@f#
int j = k >> 1; [,Gg^*umS
if (queue[j]>queue[k]) (QEG4&9
break; +7Gwg
SortUtil.swap(queue,j,k); @ Y+oiB~Y
k = j; -w2/w@&
} J1k>07}|
} K-v#.e4
D*jM1w_`
} t.<i:#rj>l
|Cv!,]9:r
} (.:e,l{U%
ah"o~Cbj
SortUtil： /uc>@!F
N~Jda o
package org.rut.util.algorithm; r!v\"6:OM
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import org.rut.util.algorithm.support.BubbleSort; ?,z}%p
import org.rut.util.algorithm.support.HeapSort; $Sq:q0
import org.rut.util.algorithm.support.ImprovedMergeSort; )lkjqFQ(
import org.rut.util.algorithm.support.ImprovedQuickSort; `Di{}/2
import org.rut.util.algorithm.support.InsertSort; Oketwa
import org.rut.util.algorithm.support.MergeSort; J.a]K[ci
import org.rut.util.algorithm.support.QuickSort; -7ep{p-
import org.rut.util.algorithm.support.SelectionSort; sJZiI}Xc
import org.rut.util.algorithm.support.ShellSort; >4TO=i
i-1op> Y
/** `5*}p#G
* @author treeroot sHj/;
* @since 2006-2-2 3o*YzwRt
* @version 1.0 -).C
*/ &>O+}>lr9
public class SortUtil { cAw/I@jG
public final static int INSERT = 1; Yy8g(bU
public final static int BUBBLE = 2; 4W75T2q#
public final static int SELECTION = 3; hrk r'3lv
public final static int SHELL = 4; wYea\^co
public final static int QUICK = 5; mh%VrAq
public final static int IMPROVED_QUICK = 6; z{q`GwW
public final static int MERGE = 7; U{mYTN*:j$
public final static int IMPROVED_MERGE = 8; $nb[GV
public final static int HEAP = 9; UMi~14& ;
W?&%x(6M
public static void sort(int[] data) { tQVVhXQ7
sort(data, IMPROVED_QUICK); @7}W=HB
} >P(.:_^p
private static String[] name={ Uo49*Mr
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" ?,/ }`3Vw
}; (3e2c
kJU2C=m@e2
private static Sort[] impl=new Sort[]{ " bG2:
new InsertSort(), u8^lB7!e/
new BubbleSort(), `[A];]
new SelectionSort(), +@UV?"d
new ShellSort(), t20K!}D_
new QuickSort(), TeQV?ZQ#}
new ImprovedQuickSort(), hH.G#-JO
new MergeSort(), BtZyn7a
new ImprovedMergeSort(), g(g& TO
new HeapSort() [g,}gyeS(
}; \V:^h[ad
z?zL97H
public static String toString(int algorithm){ >_} I.\X
return name[algorithm-1]; !D6]JPX
} qs6aB0ln
3|7QUld
public static void sort(int[] data, int algorithm) { 9WHddDA
impl[algorithm-1].sort(data); <@}9Bid!o
} d9ihhqq3}
}Jw,>}
public static interface Sort { rqq1TRg
public void sort(int[] data); t^HRgY'NjM
} IV-{ve6
X&zis1A<
public static void swap(int[] data, int i, int j) { *:1ey{w:
int temp = data; y(Td/rY.
data = data[j]; Rcv9mj]l
data[j] = temp; <3iMRe
} 0(Ij%Wi,
} )jj0^f1!j