[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; j0NPd^
} GB Un" _J
int i1=l; 5]ob;tAm
int i2=mid+1; !Bbwl-e`
for(int cur=l;cur<=r;cur++){ #yxYL0CcA:
if(i1==mid+1) 62E(=l
data[cur]=temp[i2++]; S$:S*6M@"
else if(i2>r) a m%{M7":7
data[cur]=temp[i1++]; j`hbQp\`
else if(temp[i1] data[cur]=temp[i1++]; [NDYJ'VGe
else P?ol]MwaB
data[cur]=temp[i2++]; \K=PIcH
} m5g: Q
} `G{t<7[[;
FJ. :*K[
} ZWW}r~d{
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改进后的归并排序: 1S@k=EKM
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package org.rut.util.algorithm.support; ;!Bkk9r"H
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import org.rut.util.algorithm.SortUtil; j0M;2 3@[
1 .k}gl0<
/** 6-}9m7#Y
* @author treeroot Z)~4)71Y:
* @since 2006-2-2 Ds/zl Z
* @version 1.0 _CT|5wQF<
*/ NE nP3A
public class ImprovedMergeSort implements SortUtil.Sort { yU`IyaazZ
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private static final int THRESHOLD = 10; N|d@B{a(
1 crjRbi
/* 94/}@<d-=
* (non-Javadoc) GQ8P}McA
* ,^T2hY`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) SS-
*/ yV`vu/3K
public void sort(int[] data) { 4 .qjTR
int[] temp=new int[data.length]; _en8hi@Z
mergeSort(data,temp,0,data.length-1); 9`b3=&i\
} nQC[[G*x
xbIA97g-O,
private void mergeSort(int[] data, int[] temp, int l, int r) { yK;I<8+>_
int i, j, k; 0U~JSmj:2K
int mid = (l + r) / 2; z""(M4
if (l == r) }zi6F.
return; PVQ%y
if ((mid - l) >= THRESHOLD) %*hBrjbj
mergeSort(data, temp, l, mid); S([De"y
else To95WG7G
insertSort(data, l, mid - l + 1); re2%e-F"
if ((r - mid) > THRESHOLD) =X):Zi
mergeSort(data, temp, mid + 1, r); oKiu6=
else >~:]+q
insertSort(data, mid + 1, r - mid); OYkd?LN
sy?W\(x
for (i = l; i <= mid; i++) { hCrgN?Mz
temp = data; 7tQiKrhp
} "~6BC
for (j = 1; j <= r - mid; j++) { 7;V5hul
temp[r - j + 1] = data[j + mid]; OduTg^R
} J/ ~]A1fP6
int a = temp[l]; Z9y:}:j"
int b = temp[r]; ubw ]}sfM#
for (i = l, j = r, k = l; k <= r; k++) { hB4.tMgZ
if (a < b) { :A[/;|&
data[k] = temp[i++]; Gy5W;,$q
a = temp; ){Y2TWW&0
} else { c4|.!AQ>
data[k] = temp[j--]; E7,\s
b = temp[j]; Phczf
} go@}r<B$
} +oa]v1/W
} &W%TY:Da|
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/** $}829<gh7
* @param data aap:~F{]X
* @param l J&?kezs
* @param i @9L9c
*/ gDrqs>8
private void insertSort(int[] data, int start, int len) { f{J7a1 `_
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); =W6P>r_
} y\:2Re/*Jt
} a]*^uEs
} "T'!cy
} Co M8
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堆排序： We`axkC
lZ|Ao0(
package org.rut.util.algorithm.support; Qj~0vx!
j(SQNSFD
import org.rut.util.algorithm.SortUtil; T"z!S0I
(8{Z@
/** l/]P6 @N
* @author treeroot $t]DxMd
* @since 2006-2-2 R#t~i&v/
* @version 1.0 z<ek?0?yS
*/ &HE8O}<>
public class HeapSort implements SortUtil.Sort{ &sW/r::,
HZm44y$/
/* (non-Javadoc) +$9w[ARN+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 5H79) n>
*/ *?uF&( 0
public void sort(int[] data) { _tjH=Ff$
MaxHeap h=new MaxHeap(); Djzb#M'm
h.init(data); !#r]f9QP
for(int i=0;i h.remove(); ]KfHuYjM
System.arraycopy(h.queue,1,data,0,data.length); D@Q|QY5qic
} cc>h=%s`
eRf8'-"#-
private static class MaxHeap{ m'S-h'a
h'bxgIl'`
void init(int[] data){ 9(C Ke,
this.queue=new int[data.length+1]; l6O2B/2j
for(int i=0;i queue[++size]=data; f; 22viE
fixUp(size); d&fENnt?h
} XhS<GF%
} >Nov9<p
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private int size=0; bZ389dSn
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private int[] queue; y.>r>o"0
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public int get() { $}&6p6|
return queue[1]; , w_Ew
} ]@'YlPU
]6%| L
public void remove() { ICGBU>Db
SortUtil.swap(queue,1,size--); !6kLg1
fixDown(1); EZ$m4:{e
} m\Dbb.vBvW
file://fixdown >FY`xl\m}<
private void fixDown(int k) { (j'[t
int j; [1E u6X6
while ((j = k << 1) <= size) { O|8p #
if (j < size %26amp;%26amp; queue[j] j++; Q4UaqiL
if (queue[k]>queue[j]) file://不用交换 kefQH\<X
break; |=SaI%%Be
SortUtil.swap(queue,j,k); IQR?n}ce
k = j; YpAjZQZ,
} TEY%OIzU+
} \s,ZE6dQ
private void fixUp(int k) { nlJxF5/
while (k > 1) { #wt#-U;
int j = k >> 1; vmL0H)q
if (queue[j]>queue[k]) l2$6ojpo
break; R7vO,kZ6Q
SortUtil.swap(queue,j,k); Wz9 }glr
k = j; Zj$U_
} r=u>TA$
} G6L'RP
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} wVp
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} h\jwXMi,tj
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SortUtil： YX-G>.Pc
Td?a=yu:J
package org.rut.util.algorithm; RHeql*`
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import org.rut.util.algorithm.support.BubbleSort; `O*+%/(
import org.rut.util.algorithm.support.HeapSort; H htAD Y
import org.rut.util.algorithm.support.ImprovedMergeSort; 81`-xVd
import org.rut.util.algorithm.support.ImprovedQuickSort; tK0?9M.)
import org.rut.util.algorithm.support.InsertSort; Eufw1vDa
import org.rut.util.algorithm.support.MergeSort; fsb_*sh&
import org.rut.util.algorithm.support.QuickSort; qauk,t
import org.rut.util.algorithm.support.SelectionSort; hjs[$,1
import org.rut.util.algorithm.support.ShellSort; r,aV11{
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/** ``DS?pUY
* @author treeroot $3w a%"
* @since 2006-2-2 Xb.WI\Eh
* @version 1.0 ?u/RQ 1
*/ }HRM6fR1S
public class SortUtil { DavpjwSn
public final static int INSERT = 1; c/%i,N\5
public final static int BUBBLE = 2; 9Eu.Y
public final static int SELECTION = 3; [AA'Ko
public final static int SHELL = 4; |Q[[WHqj2f
public final static int QUICK = 5; @FU9!
public final static int IMPROVED_QUICK = 6; +a0q?$\
public final static int MERGE = 7; ef*Vs
public final static int IMPROVED_MERGE = 8; ;%{REa
public final static int HEAP = 9; N D`?T &PK
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public static void sort(int[] data) { q&]I
sort(data, IMPROVED_QUICK); -T$%MX
} ?H3Ls~R
private static String[] name={ \jH^OXxb
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" Te_%r9P|2
}; 'So,*>]63
}]VFLBl`w
private static Sort[] impl=new Sort[]{ \W:~;GMeD
new InsertSort(), RE6d&#N
new BubbleSort(), :|%k*z
new SelectionSort(), r~N:|ip=
new ShellSort(), tX)l_?jVH
new QuickSort(), F5s Pd
new ImprovedQuickSort(), U|yXJ.Z3
new MergeSort(), yUd>EnQna
new ImprovedMergeSort(), )jc`_{PQg
new HeapSort() =cz^g^7
}; Ww\M3Q`h
fXD9w1
public static String toString(int algorithm){ IqD;*
return name[algorithm-1]; GP<PU
} [C@|qAh
pg0Sq9qCN
public static void sort(int[] data, int algorithm) { Z8 eB5!$
impl[algorithm-1].sort(data); ]40@yrc
} 3&`LVhx
?/3'j(Gk
public static interface Sort { x#)CH}J
public void sort(int[] data); 8=kIN-l_
} K)DpC*j
:}0>IPW-V
public static void swap(int[] data, int i, int j) { mZ_643|
int temp = data; 9^+8b9y
data = data[j]; rvEX;8TS
data[j] = temp; .s-V:k5
} C"7-lz
} T@H<Fm_