[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; w7~&Xxa/
} ='(;!3ZH
int i1=l; Hq,znRz~`
int i2=mid+1; u3HaWf3
for(int cur=l;cur<=r;cur++){ ?:W=ddg
if(i1==mid+1) ")w~pZE&+
data[cur]=temp[i2++]; zF&_9VNk=c
else if(i2>r) T? ,Q=.
data[cur]=temp[i1++]; YW"nPZNPy~
else if(temp[i1] data[cur]=temp[i1++]; ^;@!\Rc
else Wr,pm#gl6
data[cur]=temp[i2++]; U)1hC^[!
} C6d#+
} 8,:lw3x1
&pAmFe
} )(yKm/50
Ua+Us"M3}
改进后的归并排序: yRz l}
s$/Z+"f(
package org.rut.util.algorithm.support; Vtk}>I@%
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import org.rut.util.algorithm.SortUtil; GGFrV8
;$UB@)7%
/** ={~A} X01
* @author treeroot pFEU^]V3*
* @since 2006-2-2 >P2QL>P
* @version 1.0 ZMch2 U8
*/ I5g!c|#y
public class ImprovedMergeSort implements SortUtil.Sort { #}8gHI-9%
N ^H H&~V
private static final int THRESHOLD = 10; 5ma~Pjt8}
{!"lHM%
/* @T{I;8S
* (non-Javadoc) |l,0bkY@&
* 9RY}m7
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Gdlx0i
*/ OWmI$_L
public void sort(int[] data) { 8uB6C0,6?
int[] temp=new int[data.length]; ]$A6krfh|
mergeSort(data,temp,0,data.length-1); G3t\2E9S
} MG$Df$R
Q_A?p$%;L
private void mergeSort(int[] data, int[] temp, int l, int r) { /x&52~X5-
int i, j, k; 200Fd8Ju
int mid = (l + r) / 2; \05 n$.
if (l == r) )H<F([Jri
return; |A:+[35
if ((mid - l) >= THRESHOLD) y!kM#DC^
mergeSort(data, temp, l, mid); ,in"8aT}~
else IaRq6=[
insertSort(data, l, mid - l + 1); ],Y+|uX->
if ((r - mid) > THRESHOLD) S{)'1J_0
mergeSort(data, temp, mid + 1, r); \@*D;-b
else <{A|Xs
insertSort(data, mid + 1, r - mid); s#V:! 7
@4j!M1}4
for (i = l; i <= mid; i++) { |?<r
temp = data; %2rUJaOgy$
} 4CioVQdj
for (j = 1; j <= r - mid; j++) { c|~f[
temp[r - j + 1] = data[j + mid]; yyuf
} +FtL_7[v
int a = temp[l]; Xq.GvZS`
int b = temp[r]; j*@EJ"Gm>
for (i = l, j = r, k = l; k <= r; k++) { 2ee((vO&
if (a < b) { aZYs?b>Gm
data[k] = temp[i++]; n ,CMGe^:
a = temp; MNsgD3
} else { tU(vt0~b
data[k] = temp[j--]; Z)H9D(Za
b = temp[j]; #kL4Rm;
} ~0XV[$`L
} X4:SH>U!
} '5m`[S-IU
D}:M0EBS
/** dFVm18
* @param data d"JI4)%
* @param l 5nJmabw3
* @param i s9}VnNr
*/ 1r;.r|
private void insertSort(int[] data, int start, int len) { $4*k=+wS
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); '9#h^.
} :p,DAt}
} ~V<62"G
} h>A}vI*:
} q<*UeyE S
Fl&Z}&5p
堆排序： 4mJ[Wr\y
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package org.rut.util.algorithm.support; !]z6?kUK
#9)D.d|5
import org.rut.util.algorithm.SortUtil; b(.,Ex]
+XN/ bT
/** &WGG kn
* @author treeroot $S _VR
* @since 2006-2-2 fA>FU/r
* @version 1.0 -THU5AB
*/ >X!A/;$
public class HeapSort implements SortUtil.Sort{ v&i,}p^M5
B'"RKs]
/* (non-Javadoc) ^`XTs!.
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P1f@?R&t+
*/ %1oG<s
public void sort(int[] data) { Us*"g{PQ
MaxHeap h=new MaxHeap(); ($ l t@j
h.init(data); 4S+sz?W2j
for(int i=0;i h.remove(); *nh.&Mv|
System.arraycopy(h.queue,1,data,0,data.length); rF8nz:8
} Z#P:C":e
}yW*vy6`
private static class MaxHeap{ (jY -MF3
BE]PM nI
void init(int[] data){ ?pJUbZ#J
this.queue=new int[data.length+1]; 8S_v} NUm
for(int i=0;i queue[++size]=data; @s2<y@
fixUp(size); rFPfTpS
} j >wT-s
} NlnmeTLO5
oTqv$IzqP
private int size=0; s,|s;w*.
K^'NG!
private int[] queue; wUbs9y<
w0FkKJV
public int get() { uqg#(ADy?R
return queue[1]; WKB8k-.]ww
} aA5rvP+
Mmu>&C\
public void remove() { f*}H4H EO
SortUtil.swap(queue,1,size--); LYv$U;*+
fixDown(1); a8Q=_4 l
} %wYGI
file://fixdown aMaFxEW
private void fixDown(int k) { 2Xt$KF,?
int j; gVs8W3GW
while ((j = k << 1) <= size) { yA/b7x-c
if (j < size %26amp;%26amp; queue[j] j++; +%hA6n
if (queue[k]>queue[j]) file://不用交换 eviv,
break; "$VqOSo
SortUtil.swap(queue,j,k); 7Q(5Nlfcz
k = j; ^Cs5A0xo#s
} &Jr~)o
} ^mu?V-4
private void fixUp(int k) { p+;[i%`
while (k > 1) { AIR\>.~"i*
int j = k >> 1; I<'wZJRRa
if (queue[j]>queue[k]) Q]q`+ Z65
break; $1h,<$5H
SortUtil.swap(queue,j,k); G:]w UC\
k = j; lUR7zrwJ]o
} Fj`6v"h
} O<1qU M
|G5Me
} )@ /!B`
XkWO-L
} q5irKT*Hs
]0VjVU-
SortUtil： $LLy#h?V]
,,Dwb\B}
package org.rut.util.algorithm; yJ(p-3O5
Z>)(yi9+
import org.rut.util.algorithm.support.BubbleSort; n6PXPc
import org.rut.util.algorithm.support.HeapSort; K&t+3O
import org.rut.util.algorithm.support.ImprovedMergeSort; _7AR2
import org.rut.util.algorithm.support.ImprovedQuickSort; &gn^i!%Z)
import org.rut.util.algorithm.support.InsertSort; }4!R2c
import org.rut.util.algorithm.support.MergeSort; C>d_a;pX
import org.rut.util.algorithm.support.QuickSort; Sc!{ o!9\
import org.rut.util.algorithm.support.SelectionSort; cMCGaaLU
import org.rut.util.algorithm.support.ShellSort; <_S>-;by
] Fx9!S
/** ltKUpRE\?
* @author treeroot W?5u O
* @since 2006-2-2 jXBAo
* @version 1.0 `wJR^O!e
*/ Jon<?DQj
public class SortUtil { m'))prl
public final static int INSERT = 1; 1rr\l`
public final static int BUBBLE = 2; v'"0Ya
public final static int SELECTION = 3; _E[zYSo`
public final static int SHELL = 4; $"d< F3k
public final static int QUICK = 5; vjy59m
public final static int IMPROVED_QUICK = 6; 6dG:3n}
public final static int MERGE = 7; KaJCfu yp
public final static int IMPROVED_MERGE = 8; #S57SD
public final static int HEAP = 9; Oy:;v7
Y<'T;@
public static void sort(int[] data) { |U*wMYC
sort(data, IMPROVED_QUICK); XwKB+Yj0
} &{):x
private static String[] name={ l2))StEm
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" ,)u\G(N
}; kKU,|>3h
rZ0+mS'/G
private static Sort[] impl=new Sort[]{ %!5[3b'h
new InsertSort(), aKkG[qN
new BubbleSort(), sLGut7@Sg
new SelectionSort(), ,&Iw5E[
new ShellSort(), 'eNcQJh
new QuickSort(), O7p>"Bh
new ImprovedQuickSort(), )z'LXy8
new MergeSort(), \,<5U F0
new ImprovedMergeSort(), kY8aK8M
new HeapSort() J. ;9-
}; o ]UG*2
#&JhA2]q
public static String toString(int algorithm){ ={[s)G
return name[algorithm-1]; |!VSed#FSn
} =2[5g!qX
K !&{k94
public static void sort(int[] data, int algorithm) { 6I0G.N
impl[algorithm-1].sort(data); 0Q^a*7w`8a
} jpcbW
'l+).},
public static interface Sort { 3<ikMUq&
public void sort(int[] data); /%w9F
} 0_d,sC?V
1]wx Ru
public static void swap(int[] data, int i, int j) { C-Q]f
int temp = data; gxry?':
data = data[j]; Q;]g9T[)
data[j] = temp; tDF=Iqu)a
} Q+d9D1b
} =c{/ Z