[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; HSG9|}$
} #F .8x@
int i1=l; < :eKXH2
int i2=mid+1; .wm<l:
for(int cur=l;cur<=r;cur++){ ZPM7R3%V)z
if(i1==mid+1) T5pc%%q
data[cur]=temp[i2++]; 2mj>,kS?c
else if(i2>r) 4mBM5Tv
data[cur]=temp[i1++]; UlN}SddI9
else if(temp[i1] data[cur]=temp[i1++]; /Y\q&}
else #9"lL1
data[cur]=temp[i2++]; b N>Ar
} /mE:2K]C
} \2@9k`
J=^5GfM)J
} $a\X(okx
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改进后的归并排序: hhjsg?4uL
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package org.rut.util.algorithm.support; Dh{P23}
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import org.rut.util.algorithm.SortUtil; ,V4pFQzL
QKz2ONV=)
/** Q(8W5Fb?
* @author treeroot c$A}mL_
* @since 2006-2-2 6x;"T+BSSS
* @version 1.0 ?1]B(V9nBq
*/ TKw>eGe
public class ImprovedMergeSort implements SortUtil.Sort { Z-U3TrSI
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private static final int THRESHOLD = 10; *=E4|>Ul,
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/* %ULd_ES^
* (non-Javadoc) ?K}KSJ6_
* JLyFkV/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 84Hm PPt
*/ WFeaX7\b
public void sort(int[] data) { U8g?
int[] temp=new int[data.length]; q|D*H9[ke
mergeSort(data,temp,0,data.length-1); ;NJM3g0I
} n |,}
S;vZXgyN?
private void mergeSort(int[] data, int[] temp, int l, int r) { Xw^:<Nx:
int i, j, k; d7c m?+
int mid = (l + r) / 2; Z[j-.,Qu
if (l == r) @qJv
return; d<;XQ.Wo7
if ((mid - l) >= THRESHOLD) iN`L*h
mergeSort(data, temp, l, mid); ER$~kFE2yP
else kS7T'[d
insertSort(data, l, mid - l + 1); }>j1j^c1='
if ((r - mid) > THRESHOLD) ?~VevD
mergeSort(data, temp, mid + 1, r); UgO\+cI
else >yqL
insertSort(data, mid + 1, r - mid); oWOH#w
z#&qWO
for (i = l; i <= mid; i++) { \}qv}hU
temp = data; ]@1ncn7N
} RzSN,bLR
for (j = 1; j <= r - mid; j++) { p7O4CP>9[
temp[r - j + 1] = data[j + mid]; bL7mlh
} /%N~$ &wW
int a = temp[l]; }fxH>79g
int b = temp[r]; .^1=*j(;
for (i = l, j = r, k = l; k <= r; k++) { .~8IW,[
if (a < b) { &9g#Vq%
data[k] = temp[i++]; *KV]MdS
a = temp; qdu:kA:]
} else { 55|$Imnf
data[k] = temp[j--]; g(;ejKSR
b = temp[j]; N=L urXv
} 7~`6~qg.
} ae1fCw3k
} ]R]X#jm
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/** <$9AP
* @param data X!_OOfueP8
* @param l Kd,m;S\
* @param i XJOo.Y
*/ pK1(AV'L
private void insertSort(int[] data, int start, int len) { |s`q+ U-
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); m :^,qC
} Ox43(S0~
} )5V1HWjU
} CILk
} IX3U\_I#
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堆排序： >"nk}@
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package org.rut.util.algorithm.support; Pr/&p0@aV
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import org.rut.util.algorithm.SortUtil; nocH~bAf2
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/** =XS'V*
* @author treeroot wYawG$@_
* @since 2006-2-2 p9sxA|O=y
* @version 1.0 4-n.4j|
*/ yq,5M1vR
public class HeapSort implements SortUtil.Sort{ @+!d@`w:z2
9_/1TjrDN
/* (non-Javadoc) U&a]gkr
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) dX3>j{_
*/ %E!0,y,:
public void sort(int[] data) { fu&]t8MJC
MaxHeap h=new MaxHeap(); ?^+|V,<
h.init(data); =UP)b9*h
for(int i=0;i h.remove(); |Z/ySAFM
System.arraycopy(h.queue,1,data,0,data.length); hg>YOf&RG
} nz&JG~Qfm
J/*[wj
private static class MaxHeap{ e O}mZN
&\K#UVDyhh
void init(int[] data){ Bms?`7}N
this.queue=new int[data.length+1]; ,?f(~<Aj
for(int i=0;i queue[++size]=data; #sHP\|rA
fixUp(size); 5m3sjcp_
} t2$:*PvE
} 3G&1. 8
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private int size=0; C|JWom\J
>) ^!gz8
private int[] queue; zC^Ib&gm>,
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public int get() { cK } Qu
return queue[1]; vNt2s)J$
} =@f;s<v/
@'y"D
public void remove() { 2gv(`NKYE
SortUtil.swap(queue,1,size--); hv)($;
fixDown(1); ;Os3 !
} , $=V
file://fixdown !14z4]b
private void fixDown(int k) { 0.5_,an3
int j; m4 (Fuu
while ((j = k << 1) <= size) { BMW4E 5
if (j < size %26amp;%26amp; queue[j] j++; f<'C<xnf
if (queue[k]>queue[j]) file://不用交换 3QVng^"B)
break; kgu+q\?
SortUtil.swap(queue,j,k); lb('r"*.
k = j; "869n37
} M@3H]t?
} hU{%x#8}lK
private void fixUp(int k) { EKf4f^<
while (k > 1) { k4P.}SJ?
int j = k >> 1; V+q RDQ
if (queue[j]>queue[k]) 1,J.
break; 1XKk~G"D
SortUtil.swap(queue,j,k); Sm,$~~iq}
k = j; xl^'U/
} {m?x},
} $} Myj'`r
|+bG~~~%j
} .,,73"
%Z? o]
} 2P}RZvUd
#wyS?FP-
SortUtil： UTt#ltun?
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package org.rut.util.algorithm; ;a`X|N9
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import org.rut.util.algorithm.support.BubbleSort; bW]+Og
import org.rut.util.algorithm.support.HeapSort; +*q@=P,
import org.rut.util.algorithm.support.ImprovedMergeSort; /~[R u
import org.rut.util.algorithm.support.ImprovedQuickSort; >>r:L3<!
import org.rut.util.algorithm.support.InsertSort; df'g},_
import org.rut.util.algorithm.support.MergeSort; L9@jmh*E
import org.rut.util.algorithm.support.QuickSort; UK,P?_e
import org.rut.util.algorithm.support.SelectionSort; ){:aGGtko
import org.rut.util.algorithm.support.ShellSort; v(O.GhJ@
;=OH=+Rl
/** 5PPpX=\
* @author treeroot (Wqhuw!u
* @since 2006-2-2 (YOgQ)},
* @version 1.0 I .ty-X]
*/ z"#.o^5
public class SortUtil { !)=o,sVA
public final static int INSERT = 1; CmOb+:4@K
public final static int BUBBLE = 2; Ul Iw&U
public final static int SELECTION = 3; +q$|6?
public final static int SHELL = 4; jlBCu(.,_
public final static int QUICK = 5; }t'^Au`X
public final static int IMPROVED_QUICK = 6; fL;p^t u3
public final static int MERGE = 7; ULjzhy+(8
public final static int IMPROVED_MERGE = 8; !Xi>{nV
public final static int HEAP = 9; d#Ajb
]N_^{k,
public static void sort(int[] data) { )QD}R36Ic
sort(data, IMPROVED_QUICK); `9l\~t(M
} $ Zr,-
private static String[] name={ ise}> A!t
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" 0 y%R
}; }[`?#`sW
t,,^^ll
private static Sort[] impl=new Sort[]{ b*KZe[#M1
new InsertSort(), W\7*T1TDj
new BubbleSort(), v_0!uT5~NE
new SelectionSort(), #8jd,I%L
new ShellSort(), 3)a29uc:U
new QuickSort(), ltR^IiA}
new ImprovedQuickSort(), <4,?lZ
new MergeSort(), 1`{ib
new ImprovedMergeSort(), G65N:
new HeapSort() D$E9%'ir
}; `t&;Yk]-L
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public static String toString(int algorithm){ $4L3y uH
return name[algorithm-1]; {6sfa?1j
} Fr3t[:D
x["
public static void sort(int[] data, int algorithm) { 17oxD
impl[algorithm-1].sort(data); ($>0&w
} ;7k7/f:
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public static interface Sort { /g''-yT7#
public void sort(int[] data); ASw|sw
} ':]a.yA\1
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public static void swap(int[] data, int i, int j) { oFR'GUQC
int temp = data; TP::y
data = data[j]; ^^l"brPa
data[j] = temp; 9G+rxyWMW
} D:tZiS=0
} ycD.:w p\'