[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; b/g"ws_
} l5bd);Ltq
int i1=l; ^vH3 -A;*
int i2=mid+1; ? (f44Zgm
for(int cur=l;cur<=r;cur++){ j*05!j<'
if(i1==mid+1) 8NS1*\z
data[cur]=temp[i2++]; v'zj<|2
else if(i2>r) Q0cr^24/
data[cur]=temp[i1++]; u]%>=N(^2
else if(temp[i1] data[cur]=temp[i1++]; 'ffOFIz|=I
else {f }4l
data[cur]=temp[i2++]; Ap[}[:U
} qmJ^@dxs
} 5{uK;Vxse
' y9yx[P
} Md4JaFA(
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改进后的归并排序: (xhwl=MX)
:5M7*s)e16
package org.rut.util.algorithm.support; xHMbtY
K@PQLL#yJp
import org.rut.util.algorithm.SortUtil; :x<'>)6
kW=GFj)L
/** r+WY7'c
* @author treeroot >S:>_&I`I
* @since 2006-2-2 o>'1ct
* @version 1.0 ]{<`W5b/
*/ Xu8_<%
public class ImprovedMergeSort implements SortUtil.Sort { h&4f9HhS=
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private static final int THRESHOLD = 10; fQB>0RR2
g@jAIy]
/* L9=D,C~
* (non-Javadoc) /\_wDi+#
* *NDM{WB|)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) HX3R@^vo
*/ <Y9xHn&
public void sort(int[] data) { Uc3-n`C
int[] temp=new int[data.length]; URFp3qE
mergeSort(data,temp,0,data.length-1); ]O\Oj6C
} =(~UK9`
#+- /0{HT
private void mergeSort(int[] data, int[] temp, int l, int r) { m% {4
int i, j, k; G}&{]w@
int mid = (l + r) / 2; CK+GD "Z$
if (l == r) !awfxH0
return; 6SIk,Isy8
if ((mid - l) >= THRESHOLD) 8C{mV^cn~
mergeSort(data, temp, l, mid); =+qtk(p
else 1.Ximom
insertSort(data, l, mid - l + 1); y2U^7VrO
if ((r - mid) > THRESHOLD) xjOj1Hv
mergeSort(data, temp, mid + 1, r); %\ i 7
else (1pxQ%yEA
insertSort(data, mid + 1, r - mid); ;:a>#{N
@k!J}O K
for (i = l; i <= mid; i++) { oT4A|M
temp = data; fq.ui3lP)
} ]i-peBxw
for (j = 1; j <= r - mid; j++) { `;ofQz4
temp[r - j + 1] = data[j + mid]; p. eq N
} Y?(kE` R
int a = temp[l]; K{}U[@_tS
int b = temp[r]; hy"O_Le
for (i = l, j = r, k = l; k <= r; k++) { @,<@y>m7
if (a < b) { _JZwd9K
data[k] = temp[i++]; W -Yv0n3
a = temp; cViEvS r
} else { Vs-])Q?7J
data[k] = temp[j--]; ]{r*Z6bs
b = temp[j]; |=^p`CT
} xm}9(EJ
} b3G4cO;t;
} iINd*eXb^
Ny@CP}
/** G`B e~NU
* @param data HWJ(O/N
* @param l lw4#xH-?
* @param i fWx %?J
*/ CfguL@tR.
private void insertSort(int[] data, int start, int len) { :esHtkyML
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); d;3/Vr$t=
} i+$G=Z#3E
} BitP?6KX
} B&~#.<23:
} R\%&Q|
2nW:|*:/p6
堆排序： 3[g%T2&[
S <C'#vj
package org.rut.util.algorithm.support; p&SxR}h
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import org.rut.util.algorithm.SortUtil; _;G. QwHr
,9I %t%sb
/** uXX3IE[
* @author treeroot o5UM)g
* @since 2006-2-2 }fps~R
* @version 1.0 gOpi>
*/ @6eM{3E.
public class HeapSort implements SortUtil.Sort{ ]Ek6EuaK
Zl5cHejM
/* (non-Javadoc) dzIcX*"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _MF:?p,l
*/ 3*< O-Jr
public void sort(int[] data) { aDrF"j
MaxHeap h=new MaxHeap(); s}8(__|
h.init(data); /5qeNjI+2
for(int i=0;i h.remove(); !~+"TI}_%w
System.arraycopy(h.queue,1,data,0,data.length); 'R&Y pR
} Aofk<O!M
ftS^|%p
private static class MaxHeap{ @>Y.s6a
: +Na8\d
void init(int[] data){ DQC=f8
this.queue=new int[data.length+1]; G:$Ta6=
for(int i=0;i queue[++size]=data; Lnin;0~{
fixUp(size); T r|B:)X
} ~HWH2g
} ({XB,Rm
h<)YZ[;x
private int size=0; nQe^Bn
o~Jce$X
private int[] queue; ETt7?,x@
bXSsN\:Y@[
public int get() { x*]&Ca0+
return queue[1]; ]mDsd*1
} qH#?, sK ^
> -P UY
public void remove() { ;WydXQ}Q^
SortUtil.swap(queue,1,size--); =<,>dBs}\
fixDown(1); ^HJvT)e4
} p:*)rE
file://fixdown }e/#dMEi
private void fixDown(int k) { %sd1`1In
int j; N_3$B=
while ((j = k << 1) <= size) { ZDMv8BP7
if (j < size %26amp;%26amp; queue[j] j++; Ri[ v(Zf
if (queue[k]>queue[j]) file://不用交换 'o D31\@I
break; Mnj\t3:
SortUtil.swap(queue,j,k); 9|kc$+(+6
k = j; L#t^:%
} 0:NCIsIm<
} 5k%GjT
private void fixUp(int k) { U/hf?T;
while (k > 1) { ( (.b&
int j = k >> 1; OvL@@SX |
if (queue[j]>queue[k]) K fM6(f:
break; OZDd
SortUtil.swap(queue,j,k); D<V[:~-o
k = j; uu5AW=j
} MR=dQc
} gLm ]*
r#8t@W
} 1 u[a713O
GSHJ?}U,
} %pikt7,Z~
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SortUtil： ;Jh=7wx
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package org.rut.util.algorithm; Z2Q'9C},m
){-Tt`0(u
import org.rut.util.algorithm.support.BubbleSort; q mJ#cmN
import org.rut.util.algorithm.support.HeapSort; c@eQSy
import org.rut.util.algorithm.support.ImprovedMergeSort; +c7e[hz
import org.rut.util.algorithm.support.ImprovedQuickSort; Ly\ `
import org.rut.util.algorithm.support.InsertSort; 8i epG
import org.rut.util.algorithm.support.MergeSort; @fI1|v=eF
import org.rut.util.algorithm.support.QuickSort; Hnq$d6F
import org.rut.util.algorithm.support.SelectionSort; Th\w#%'N
import org.rut.util.algorithm.support.ShellSort; FfeX;pi
Yz%AKp
/** ":qhO0
* @author treeroot "3&bh>#qY
* @since 2006-2-2 U z*7J
* @version 1.0 MNuBZnO
*/ EgE%NY~
public class SortUtil { I{/}pr>
public final static int INSERT = 1; !6`pq
public final static int BUBBLE = 2; n]%T>\gw
public final static int SELECTION = 3; 4Nb&(p
public final static int SHELL = 4; "YC5viX
public final static int QUICK = 5; =,MX%-2
public final static int IMPROVED_QUICK = 6; 8;%F-?
public final static int MERGE = 7; jDO"?@+
public final static int IMPROVED_MERGE = 8; [:hTwBRF
public final static int HEAP = 9; 4!vovt{
4](jV}Hg
public static void sort(int[] data) { DB=^Z%%Z
sort(data, IMPROVED_QUICK); }s@ i
} +.czj,Sq
private static String[] name={ /8cfdP Ba
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" GbXa=* <-<
}; 5WlBec@
vtByCu5
private static Sort[] impl=new Sort[]{ &c AFKYt
new InsertSort(), u5'jIqlU
new BubbleSort(), ' ?4\
new SelectionSort(), dmB _`R
new ShellSort(), KUV(vAY,
new QuickSort(), pW7#&@AR
new ImprovedQuickSort(), 5bj9S
new MergeSort(), Zra P\?
new ImprovedMergeSort(), )yl;i
new HeapSort() ln1QY"g
}; M?gc&2Y
Hf$pwfGcY]
public static String toString(int algorithm){ 3D}rxI8N
return name[algorithm-1]; w/1Os!p
} B[$L)y'-;
kB! iEoIBA
public static void sort(int[] data, int algorithm) { Md*~hb8J
impl[algorithm-1].sort(data); hifC.guK
} t}Q PPp y
2Wx~+@1y
public static interface Sort { Qi;62M
public void sort(int[] data); K,f"Q<sU%
} mNQ~9OJ1
nb30<h
public static void swap(int[] data, int i, int j) { V*I2
int temp = data; Pb]EpyAW
data = data[j]; {qJ(55
data[j] = temp; ev4f9Fhu
} W2w A66MB
} 3oQ?VP