[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; g^^^fKUp)
} [ * !0DW`
int i1=l; $BOpjDV8
int i2=mid+1; 2-^['R
for(int cur=l;cur<=r;cur++){ RI BB*
if(i1==mid+1) F0'8n6zj
data[cur]=temp[i2++]; M*dou_Q
else if(i2>r) s*vtCdrE.
data[cur]=temp[i1++]; d%oHcn
else if(temp[i1] data[cur]=temp[i1++]; #c-Jo[%G
else q2M%AvR
data[cur]=temp[i2++]; 0p'g+ 2
} p&HkR^.S
} Nl{on"il
KCn#*[
} (dym*_J
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改进后的归并排序: pH0MVu(W
@! jpJ}
package org.rut.util.algorithm.support; s$/Z+"f(
:oJ!9\5
import org.rut.util.algorithm.SortUtil; 2F:X:f
) 3I|6iS
/** Z FIgKWZ'
* @author treeroot qx}*L'xB
* @since 2006-2-2 UDb
* @version 1.0 5_SxX@fW%
*/ ~bfjP2 g
public class ImprovedMergeSort implements SortUtil.Sort { 6Q`7>l.|?
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private static final int THRESHOLD = 10; ZMch2 U8
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/* ?<soX8_1
* (non-Javadoc) ,D`\ RV
* weIlWxy
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8HdjZ!
*/ Y+3r{OI
public void sort(int[] data) { vFK(Dx
int[] temp=new int[data.length]; `_M&zN
mergeSort(data,temp,0,data.length-1); ^2mCF
} ] -G~
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private void mergeSort(int[] data, int[] temp, int l, int r) { `R:HMO[ow
int i, j, k; T2k# "zD
int mid = (l + r) / 2; e'dZ2;X$zo
if (l == r) \eS-wO7%
return; yzJTNLff
if ((mid - l) >= THRESHOLD) $9<P3J 1
mergeSort(data, temp, l, mid); PL*kjrLu7
else (M,*R v
insertSort(data, l, mid - l + 1); K<"Y4O#]
if ((r - mid) > THRESHOLD) `wLMJ,@f.
mergeSort(data, temp, mid + 1, r); C?PgC~y)
else gOn^}%4.I
insertSort(data, mid + 1, r - mid); q6V\n:hKV
fngk<$lvg
for (i = l; i <= mid; i++) { zY\MzhkX,
temp = data; J ?H|"
} :JG2xtn
for (j = 1; j <= r - mid; j++) { |dk9/xdX
temp[r - j + 1] = data[j + mid]; t0o'_>*?A
} I$1~;!<
int a = temp[l]; YN5p@b=FX
int b = temp[r]; M1=y-3dW3
for (i = l, j = r, k = l; k <= r; k++) { Pqv9>N|
if (a < b) { A*+KlhT
data[k] = temp[i++]; 7a'@NgiGg
a = temp; w_^g-P[o-
} else { l|~SVk|
data[k] = temp[j--]; ewzZb*\
b = temp[j]; -$5nqaK?
} jRo4+8
} 9N{"ob Z
} NW@guhK.
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/** 73'.TReK
* @param data &&{_T4
* @param l nV+]jQ~o
* @param i \j3XT}
*/ P :D6w){
private void insertSort(int[] data, int start, int len) { IBe0?F #
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); %4HpTx
} fW.)!EPO
} @mrGG F
} 4?9cyv4H
} a76`"(W
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堆排序： (3M7RpsL@
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package org.rut.util.algorithm.support; [ZkK)78}k
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import org.rut.util.algorithm.SortUtil; "<I*ViZ
ia}V8i
/** ![#>{Q4i
* @author treeroot 9Wi+7_)
* @since 2006-2-2 ~g[<A?0=y
* @version 1.0 X:Z*7P/
*/ A('_.J=
public class HeapSort implements SortUtil.Sort{ Pf,lZU?f
evLZ<|
/* (non-Javadoc) ;bMmJ>[l-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ju8DmC5
*/ /SvB w>gQ
public void sort(int[] data) { ImG7E w
MaxHeap h=new MaxHeap(); :&'[#%h8
h.init(data); Jg2*$gL;_
for(int i=0;i h.remove(); p(8[n^~,i
System.arraycopy(h.queue,1,data,0,data.length); &x#3N=c#
} )Bb:?!EuEH
;+Mee^E>!
private static class MaxHeap{ :W6R]y
's>./Pf
void init(int[] data){ s~)I1G
this.queue=new int[data.length+1]; jg3X6/'
for(int i=0;i queue[++size]=data; ]tnf<5x
fixUp(size); .}4^b\
} i\yp(tE%^
} =*\(Y(0
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private int size=0; "P9SW?',
7W7yjG3g
private int[] queue; iYR`|PJi
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public int get() { l(j._j~p
return queue[1]; y/\0qQ/
} )N}.n2Y8W
l2ww3)Z
public void remove() { 3$#=*Zp
SortUtil.swap(queue,1,size--); /@xL {
fixDown(1); 11Y4oS
} OY'6~w9
file://fixdown J!"#N}[
private void fixDown(int k) { 3zsjL=ta
int j; *3s,~<''%
while ((j = k << 1) <= size) { & Do|Hw
if (j < size %26amp;%26amp; queue[j] j++; FS^ie|8{D-
if (queue[k]>queue[j]) file://不用交换 {Hr P;)
break; !IAd.<,
SortUtil.swap(queue,j,k); u[b0MNE~
k = j; FXO{i:Zo
} JM>4m)h#
} +|c1G[Jh
private void fixUp(int k) { Bm:N@wg
while (k > 1) { "IMq +
int j = k >> 1; ,Z aPY
if (queue[j]>queue[k]) }:9UI
break; <52)
SortUtil.swap(queue,j,k); j"wbq-n,7
k = j; em,j>qp
} whb,2=gIE
} ^ygh[.e,
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} AiOz1Er
fF.qQTy;7
} 0OF]|hH
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SortUtil： `bMwt?[*
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package org.rut.util.algorithm; a,~}G'U
8Ssk>M*
import org.rut.util.algorithm.support.BubbleSort; _;8+L\
import org.rut.util.algorithm.support.HeapSort; kp>AZVk
import org.rut.util.algorithm.support.ImprovedMergeSort; q+)csgN
import org.rut.util.algorithm.support.ImprovedQuickSort; OYwH$5
import org.rut.util.algorithm.support.InsertSort; IP-}J$$1
import org.rut.util.algorithm.support.MergeSort; =[x @BzH
import org.rut.util.algorithm.support.QuickSort; y jQpdO
import org.rut.util.algorithm.support.SelectionSort; VSQxlAGk@
import org.rut.util.algorithm.support.ShellSort; !Q" 3B6 86
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/** ]xf|xs
* @author treeroot L; f
* @since 2006-2-2 8j%hxAV$
* @version 1.0 n3LCQ:]Tf
*/ .X(*mmH
public class SortUtil { `z]MQdE_w
public final static int INSERT = 1; u>I;Cir4
public final static int BUBBLE = 2; "H!2{l{
public final static int SELECTION = 3; RBM(>lU:
public final static int SHELL = 4; `Z!NOC
public final static int QUICK = 5; FdVWj 5 $a
public final static int IMPROVED_QUICK = 6; )Og,VXEB
public final static int MERGE = 7; ecl$z6'c
public final static int IMPROVED_MERGE = 8; 8`j;v>2
public final static int HEAP = 9; w+Cs=!
2(Ez H
public static void sort(int[] data) { JkMf+!
sort(data, IMPROVED_QUICK); kH10z~(e
} g6=w MRt[
private static String[] name={ <^,5z!z}
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" g,seqh%
}; *=O~TY<](
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private static Sort[] impl=new Sort[]{ h r!Htew4
new InsertSort(), Q<F-l.q
new BubbleSort(), .sk$@Q
new SelectionSort(), -{A!zTw1w
new ShellSort(), Y)=89s&t
new QuickSort(), ,:!dqonn
new ImprovedQuickSort(), 8>sToNRNe
new MergeSort(), oU.LYz_
new ImprovedMergeSort(), -r!N; s$t
new HeapSort() Jm+hDZrW
}; fem>WPvG
|<n+6
public static String toString(int algorithm){ u}7#3JfLn
return name[algorithm-1]; \HzI*|*A
} <R.5Ma
4ZK8Y[]Lv
public static void sort(int[] data, int algorithm) { xM/B"SG2
impl[algorithm-1].sort(data); P"<HxT?
} $Qv+*%c
H?P:;1A]c
public static interface Sort { ^/3R/;?
public void sort(int[] data); f@R j;R~Jp
} ( *(#;|m
;-d }\f ,
public static void swap(int[] data, int i, int j) { T>&d/$;]
int temp = data; 0wLu*K5$4E
data = data[j]; NY'sZTM&
data[j] = temp; e ]-fb{oVH
} 6Ih8~Hu
} Cngi5._Lb