[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; @.=2*e.z|b
} VrKLEN\
int i1=l; MH]?:]K9V
int i2=mid+1; 'X\C/8\
for(int cur=l;cur<=r;cur++){ ?'>[nm
if(i1==mid+1) <J]N E|:
data[cur]=temp[i2++]; ,!^g8zO
else if(i2>r) MIu'OJ"z~
data[cur]=temp[i1++]; bWZ oGFT
else if(temp[i1] data[cur]=temp[i1++]; u$ vLwJ|o
else :4>LtfA
data[cur]=temp[i2++]; @sRb1+nn
} ?i\$U'2*z3
} }5d|y*
:2lM7|@/
} EkOn Rm_hn
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改进后的归并排序: zR%)@wh
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package org.rut.util.algorithm.support; >?{> !#1
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import org.rut.util.algorithm.SortUtil; o{7w&Pgs2
cr!sq.)s
/** j[=P3Z0q
* @author treeroot F3nPQw{;
* @since 2006-2-2 "77l~3
* @version 1.0 2bf#L?5g/
*/ Ut(BQM>U+$
public class ImprovedMergeSort implements SortUtil.Sort { b:&=W>r
>BjZ{7?Ok
private static final int THRESHOLD = 10; hAB:;r XlI
3ZAzv en
/* `)H| &!wT
* (non-Javadoc) x&gS.b*
* !/"y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) PkK#HD
*/ 8WwLKZ}
public void sort(int[] data) { ab5i7@Ed
int[] temp=new int[data.length]; =Q8$O 2TW
mergeSort(data,temp,0,data.length-1); F'55BY*!
} 1k)`C<l
]r1Lr{7^S
private void mergeSort(int[] data, int[] temp, int l, int r) { af/;Dr@
int i, j, k; >;X^+JH!)
int mid = (l + r) / 2; SU4~x0
if (l == r) C2?p>S/q
return; k= 9a/M u
if ((mid - l) >= THRESHOLD) ,oj)`?Vh
mergeSort(data, temp, l, mid); =1j`VJU9
else jE$]Z(Ab
insertSort(data, l, mid - l + 1); =l$qwcfbo
if ((r - mid) > THRESHOLD) 'L6+B1Op
mergeSort(data, temp, mid + 1, r); PLWx'N-kqL
else &&n-$WEl
insertSort(data, mid + 1, r - mid); M5B?`mTl
N4,!b_1
for (i = l; i <= mid; i++) { 9riKSp:5
temp = data; ld'Aaxl&
} c6HH%|
for (j = 1; j <= r - mid; j++) { jhE3@c@pT
temp[r - j + 1] = data[j + mid]; v?4MndR
} j`"cU$NRM
int a = temp[l]; _MGhG{p7t
int b = temp[r]; f>+:UGmP
for (i = l, j = r, k = l; k <= r; k++) { oz?6$oE(bt
if (a < b) { M+\LH
data[k] = temp[i++]; 5?MKx!%
a = temp; !%YV0O0
} else { :;Wh!8+j
data[k] = temp[j--]; G6j9,#2@
b = temp[j]; $!"*h
} v:Z.8m8D
} FuO'%3;c
} gx6$:j;
ZSW`/}Dp;
/** b%I2ig
* @param data .sbV<ulbc
* @param l M{~KT3c
* @param i 4N{^niq7
*/ b~m|mb$
private void insertSort(int[] data, int start, int len) { %-[U;pJe;
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); AY%Y,<a
} Og<UW^VR
} MXuiQ;./
} ESv&x6H
} wz5*?[4
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堆排序： U*Pi%J
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package org.rut.util.algorithm.support; <o\I C?A
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import org.rut.util.algorithm.SortUtil; sMAu*
=ZN~*HLl}
/** eMDraJv@
* @author treeroot vh^,8pPy
* @since 2006-2-2 VBI~U?0
* @version 1.0 b$'}IWNV
*/ a(`@u&]WZ
public class HeapSort implements SortUtil.Sort{ (SYSw%v$A
<f`G@
/* (non-Javadoc) -AxO1 qO
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) [O(8izv
*/ p/inATH
public void sort(int[] data) { V$fvf#T
MaxHeap h=new MaxHeap(); m|+g_JZ
h.init(data); Sj<WiQ%<
for(int i=0;i h.remove(); gEU|Bx/!=
System.arraycopy(h.queue,1,data,0,data.length); ,_2ZKO/k$
} :*/`"M)'
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private static class MaxHeap{ S-k:+4
2Fsv_t&*>
void init(int[] data){ Q'S"$^~{
this.queue=new int[data.length+1]; k\a&4v
for(int i=0;i queue[++size]=data; JA~v:ec
fixUp(size); k),.
} J-g<-!>RM
} myeez+@ m
BSB;0OM
private int size=0; G\ht)7SGgf
~1v5H]T{
private int[] queue; K=82fF(-
+1%7*2q,
public int get() { YCd[s[
return queue[1]; UL.x*@o
} 8%wu:;*]%
/2e&fxxD
public void remove() { lUd;u*A
SortUtil.swap(queue,1,size--); 9vZD?6D,n
fixDown(1); N8^AH8l
} >ps=z$4j*
file://fixdown Qs5^kddz=
private void fixDown(int k) { <r'l5|er
int j; ]V K%6PQ0
while ((j = k << 1) <= size) { .`3O4]N[
if (j < size %26amp;%26amp; queue[j] j++; ==\Qj{ 7`
if (queue[k]>queue[j]) file://不用交换 e$3{URg
break; ]e+88eQ
SortUtil.swap(queue,j,k); ]FNqNZ
k = j; sox0:9Oqnf
} $Dm2>:Dmt
} j!:^+F/
private void fixUp(int k) { &6`h%;a/&
while (k > 1) { cn$o$:tW
int j = k >> 1; \'gb{JO
if (queue[j]>queue[k]) "NgfdLz
break; ZYy?JDAO
SortUtil.swap(queue,j,k); |aovZ/b4
k = j; :Ej#qYi
} W5^m[,GU'
} w+NdEE4H9z
MM*B.y~TxZ
} .A. VOf_
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} Hq*\,`b&
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SortUtil： M;\iL?,
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package org.rut.util.algorithm; W h^9 Aq
5QjM,"`mp
import org.rut.util.algorithm.support.BubbleSort; <n)J~B^
import org.rut.util.algorithm.support.HeapSort; Az}.Z'LJ
import org.rut.util.algorithm.support.ImprovedMergeSort; 5mxYzu;#]
import org.rut.util.algorithm.support.ImprovedQuickSort; u._B7R&>
import org.rut.util.algorithm.support.InsertSort; oK5"RW
import org.rut.util.algorithm.support.MergeSort; ([r4N#lx
import org.rut.util.algorithm.support.QuickSort; 8tR(i[L
import org.rut.util.algorithm.support.SelectionSort; <:mV^tK
import org.rut.util.algorithm.support.ShellSort; %)$^_4.g
J.r^"K\
/** -r6cK,WVU
* @author treeroot t0 1@h_WS
* @since 2006-2-2 NT6OGBl&
* @version 1.0 1gwnG&
*/ "+g9}g
public class SortUtil { H<|ilL'fX
public final static int INSERT = 1; kf8-#Q/B
public final static int BUBBLE = 2; \~]HfDu
public final static int SELECTION = 3; Z-fQ{&a{
public final static int SHELL = 4; 8T7E.guYr
public final static int QUICK = 5; wE.CZ%f
public final static int IMPROVED_QUICK = 6; _R,VNk
public final static int MERGE = 7; Pd<s#
public final static int IMPROVED_MERGE = 8; &p)]Cl/`
public final static int HEAP = 9; ;wi}6rF%[i
zq=X;}qYj
public static void sort(int[] data) { a5/6DK>
sort(data, IMPROVED_QUICK); b1(7<o
} D`?=]Ysz(
private static String[] name={ J3F-Yl|
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" i|]Kw9
}; !\ IgTt,
&Hb;; Ic(
private static Sort[] impl=new Sort[]{ 7*9a`p3w
new InsertSort(), lTe7n'y^^
new BubbleSort(), #mI{D\UR
new SelectionSort(), 5/vfmDt3'G
new ShellSort(), INi9`M.h
new QuickSort(), CWP),]#n
new ImprovedQuickSort(), o=t@83Fh5
new MergeSort(), vr,8i7*0
new ImprovedMergeSort(), [z2XK4\e1T
new HeapSort() bjQp6!TsZ
}; u?(@hUV.
TY(B]Q_o
public static String toString(int algorithm){ .l| [e
return name[algorithm-1]; 66P'87G
} #y<KO`Es
iYqZBLf{S
public static void sort(int[] data, int algorithm) { kYlsjM
impl[algorithm-1].sort(data); L\cd=&b`
} JnWG_|m)
1S&GhJ<wJ
public static interface Sort { #H'j;=]:
public void sort(int[] data); _2eRH@T
} gRnn}LL^
,g.*Mx`-
public static void swap(int[] data, int i, int j) { 'pCZx9*c
int temp = data; k$u\\`i]oC
data = data[j]; {:D8@jb[
data[j] = temp; |[)k5nUQ|
} 1ZL91'U
} ~$I9%z7@