[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; n&(3o6i'
} .iN-4"_j1
int i1=l; kja4!_d
int i2=mid+1; nMLU-C!t
for(int cur=l;cur<=r;cur++){ BEFe~* ~
if(i1==mid+1) -?[O"D"c
data[cur]=temp[i2++]; X #&(~1O
else if(i2>r) 1<;\6sg
data[cur]=temp[i1++]; H^ESAs6
else if(temp[i1] data[cur]=temp[i1++]; k>7gy?Y!K<
else (\T8!s{AO
data[cur]=temp[i2++]; 7sCR!0
} Pv^(Q]
} !Jk(&.
<Sz>ZIISd
} f34_?F<h
cb\jrbj6
改进后的归并排序: -7&^jP\,
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package org.rut.util.algorithm.support; c(QG4.)m
xhw8#
import org.rut.util.algorithm.SortUtil; Z|V"8jE
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/** w:~nw;.T
* @author treeroot Ry3+/]
* @since 2006-2-2 45]Ym{]
* @version 1.0 }IxY(`:qs
*/ Fr1;)WV
public class ImprovedMergeSort implements SortUtil.Sort { 0sq=5 BnO
QC$=Fs5+
private static final int THRESHOLD = 10; 2U-#0,ll]
s:-8 Z\,
/* `I]1l MJ)o
* (non-Javadoc) .6lY*LI
* {hkM*:U
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) fvAh?<Ul
*/ .WN;TjEg!
public void sort(int[] data) { F{a0X0ru~
int[] temp=new int[data.length]; _ Yb Eo+
mergeSort(data,temp,0,data.length-1); |G`4"``]k
} @&nx;K6h
n?<# {$
private void mergeSort(int[] data, int[] temp, int l, int r) { EOd.Tyb!/
int i, j, k; _qO;{%r
int mid = (l + r) / 2; ')1}#V/I
if (l == r) W TXD4}
return; N\CEocU
if ((mid - l) >= THRESHOLD) #cSw"A
mergeSort(data, temp, l, mid); YoSo0fQA
else )7Hon
insertSort(data, l, mid - l + 1); 7gZVg@
if ((r - mid) > THRESHOLD) {WM&
mergeSort(data, temp, mid + 1, r); ~P"!DaAf
else XNkQk0i;g&
insertSort(data, mid + 1, r - mid); R:pBbA7E
:*F3
for (i = l; i <= mid; i++) { 'KG`{K$
temp = data; ktb.fhO
} ttrp|(
for (j = 1; j <= r - mid; j++) { O[5ti=W
temp[r - j + 1] = data[j + mid]; K*[wr@)u
} @,.H)\a4
int a = temp[l]; :#;?dMkTY
int b = temp[r]; Uy=eHwU?J
for (i = l, j = r, k = l; k <= r; k++) { <u\G&cd_tA
if (a < b) { /8R1$7
data[k] = temp[i++]; '@bA_F(
a = temp; 38^_(N
} else { = %m/
data[k] = temp[j--]; 2"T&Fp<
b = temp[j]; m? hX=
} 5`Z#m:+u
} 6dp~19T^
} ufOaD7
HN! l-z
/** @ ri.r1
* @param data ;.Y`T/eWS
* @param l .^,vK7
* @param i M 5h U.3.L
*/ rO~D{)Nu
private void insertSort(int[] data, int start, int len) { KN=Orx7Gy
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); )_uK(UNZ5
} $- L)>"
} *`W82V
} xXtDGP
} RzkJS9)m
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堆排序： {+MMqJCa
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package org.rut.util.algorithm.support; WJ@,f%=<~
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import org.rut.util.algorithm.SortUtil; &'R]oeag
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/** 7iJlW&W
* @author treeroot s`{O-
* @since 2006-2-2 = FQH
* @version 1.0 r|(Lb'k
*/ wRKGJ
public class HeapSort implements SortUtil.Sort{ *KMCU m
_LK(j;6K}
/* (non-Javadoc) {5*5tCIt
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B:l(`G
*/ .R1)i-^
public void sort(int[] data) { ,^3D"Tky
MaxHeap h=new MaxHeap(); ]ba<4:[Go
h.init(data); 79Iz,_
for(int i=0;i h.remove(); Z?~7#F~Z`
System.arraycopy(h.queue,1,data,0,data.length); _K8-O>I "
} q>Y_I<;'g
{W-PYHZ;
private static class MaxHeap{ 2/GH5b(
9i"3R0HN
void init(int[] data){ )2a!EEHz
this.queue=new int[data.length+1]; Ws=J)2q
for(int i=0;i queue[++size]=data; 1{A4_/R
fixUp(size); 9TeDLp
} /HLQ
} 3vy5JTCz~
X/@Gx 4
private int size=0; .AKx8=f
L-fAT'!'
private int[] queue; (bXCc
W?.Y%wc0
public int get() { ct/I85c@P
return queue[1]; L)Kn8
} VRD2e ,K
HzWZQ6o
public void remove() { FC(m)S2
SortUtil.swap(queue,1,size--); &We'omq
fixDown(1); ?9AByg
} 1 }:k w
file://fixdown 5t0$nKah]
private void fixDown(int k) { py)V7*CgH
int j; $?0<rvGJ
while ((j = k << 1) <= size) { q+SDJ?v
if (j < size %26amp;%26amp; queue[j] j++; J9{B
if (queue[k]>queue[j]) file://不用交换 Xc'yz 2B
break; B [03,zVf
SortUtil.swap(queue,j,k); 4H{L>e
k = j; X\M0Q%8
} +&JF|#FQ`
} lO<Ujb#"R
private void fixUp(int k) { <>p\9rVp*^
while (k > 1) { e=YvMg
int j = k >> 1; ~bgFU
if (queue[j]>queue[k]) R\6#J0&Y-
break; T"3WB o
SortUtil.swap(queue,j,k); IA''-+9
k = j; ?9/%K45
} he 9qWL&^G
} h}.0Ne
cLX~NPD/
} !k Hpw2
ln9U>*<
} 2g|+*.*`
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SortUtil： ASPfzW2
3]/w3|y
package org.rut.util.algorithm; H2[S]`?
J/WPffqD
import org.rut.util.algorithm.support.BubbleSort; yG{'hx6H
import org.rut.util.algorithm.support.HeapSort; !c'a<{d@
import org.rut.util.algorithm.support.ImprovedMergeSort; <{:$]3
import org.rut.util.algorithm.support.ImprovedQuickSort; a'W-&j
import org.rut.util.algorithm.support.InsertSort; N(6|TE2
import org.rut.util.algorithm.support.MergeSort; nQb{/ TqC'
import org.rut.util.algorithm.support.QuickSort; NgQ {'H[Y
import org.rut.util.algorithm.support.SelectionSort; sYgpK92
import org.rut.util.algorithm.support.ShellSort; }D{y u+)
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/** ^DM^HSm
* @author treeroot XF'K dz>p
* @since 2006-2-2 Tgc)'8A;BN
* @version 1.0 cea%M3
*/ |?i-y3N
public class SortUtil { ESL(Mf'
public final static int INSERT = 1; mO(m%3
public final static int BUBBLE = 2; {H=DeQ
public final static int SELECTION = 3; 4F^(3RKZ|
public final static int SHELL = 4; #iJ+}EW _
public final static int QUICK = 5; R^{Ow
public final static int IMPROVED_QUICK = 6; -[^aWNqyJ
public final static int MERGE = 7; IhhB^E|
public final static int IMPROVED_MERGE = 8; z%<Z#5_N
public final static int HEAP = 9; %D:Mt|
&>XIK8*
public static void sort(int[] data) { ]9pK^<
sort(data, IMPROVED_QUICK); Gn>#Mvq
} ]*'V#;s
private static String[] name={ _ )b:F=4j
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" 'P3CgpF<Z2
}; |W[BqQIf
Xb@lKX5Re
private static Sort[] impl=new Sort[]{ *VmJydd
new InsertSort(), KU|dw^Yk
new BubbleSort(), A(S=
new SelectionSort(), <DxUqCE
new ShellSort(), 4Z.G
new QuickSort(), |*8 J.H*r
new ImprovedQuickSort(), R|5w:+=z
new MergeSort(), k2O==IG]6
new ImprovedMergeSort(), _%.atW7
new HeapSort() M<Eg<*
}; ?HU(0Vgn'
0 5 `x$f
public static String toString(int algorithm){ B(E+2;!QF
return name[algorithm-1]; {:!*1L
} nww,y
gX]?`u
public static void sort(int[] data, int algorithm) { ld}-}W-cq
impl[algorithm-1].sort(data); ,@(lYeD"
} (AV j_Cw
5Vf#(r f
public static interface Sort { CSIW|R@
public void sort(int[] data); _sx]`3/86
} 3-z57f,}6~
PC=b.H8P+W
public static void swap(int[] data, int i, int j) { U%m,:b6V
int temp = data; 1@;Dn'
data = data[j]; A"d=,?yE
data[j] = temp; REc69Y.k
} mM!Gomp
} CKy' 8I9