[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; 2e<u/M21>
} y7ZYo7avg
int i1=l; _Oc(K "v
int i2=mid+1; _wp_y-"
for(int cur=l;cur<=r;cur++){ EZee kxs
if(i1==mid+1) WZQ EBXs
data[cur]=temp[i2++]; =H_vRd
else if(i2>r) (~ `?_
data[cur]=temp[i1++]; Jmml2?V-c
else if(temp[i1] data[cur]=temp[i1++]; qGXY
else >|1$Pv?
data[cur]=temp[i2++]; -FGM>~x
} /7fD;H^*
} '5xvR G
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} M->BV9
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改进后的归并排序: &`%J1[dy
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package org.rut.util.algorithm.support; sJ{J@/5
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import org.rut.util.algorithm.SortUtil; WdZ_^
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/** R^?9V=Y<T
* @author treeroot )C>8B`^S
* @since 2006-2-2 R KXhD PA
* @version 1.0 >n"4M~I
*/ [e f&|Pi-
public class ImprovedMergeSort implements SortUtil.Sort { ^iqy|zNtn
|*%i]@V=
private static final int THRESHOLD = 10; + usB$=kJ
gA:unsI
/* _zK ~9/5
* (non-Javadoc) Mc9JFzp
* 1'YUK"i
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =1+/`w
*/ X-y3CO:&@h
public void sort(int[] data) { c\le8C3
int[] temp=new int[data.length]; i?:#lbw_
mergeSort(data,temp,0,data.length-1); -~Chf4?<4
} ' +f(9/
"8iIOeY-\
private void mergeSort(int[] data, int[] temp, int l, int r) { P}=U #AV4
int i, j, k; '>k1h.i
int mid = (l + r) / 2; yXT.]%)
if (l == r) +.-g`Vyz*
return; cb5T-'hY
if ((mid - l) >= THRESHOLD) y!VL`xV
mergeSort(data, temp, l, mid); PS3jCT
else 2-pv &
insertSort(data, l, mid - l + 1); 2(2UAB"u
if ((r - mid) > THRESHOLD) +yI2G! $T9
mergeSort(data, temp, mid + 1, r); @+7CfvM
else ~5>k_\G8
insertSort(data, mid + 1, r - mid); D4O^5?F)|
)8`i%2i=
for (i = l; i <= mid; i++) { -)Hc^'.
temp = data; {_R{gpj'
} 64qqJmG3
for (j = 1; j <= r - mid; j++) { q&2L@l3A
temp[r - j + 1] = data[j + mid]; hplxs#
} sQmJ3 (:HO
int a = temp[l]; sLd%m+*p
int b = temp[r]; vcC"
for (i = l, j = r, k = l; k <= r; k++) { }z F,dst
if (a < b) { 0[f[6mm%m
data[k] = temp[i++]; :?j]W2+kR
a = temp; Jb6)U]
} else { wv
data[k] = temp[j--]; 1T}jK^"
b = temp[j]; NpH9},1i
} 2 b80b50
} %)w7t[A2D
} AAF']z<4_"
*RmD%[f
/** K SJ Ko
* @param data YQ>O6:%
* @param l H6hhU'Kxf8
* @param i 9\VV++}s>o
*/ >eWORf>7
private void insertSort(int[] data, int start, int len) { PXFu
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); Vy6~O|68=
} ^"iJ
} cs 58: G5
} K+|0~/0
} (QS 0
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堆排序： a1shP};pK
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package org.rut.util.algorithm.support; Gi\Z"MiBZ
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import org.rut.util.algorithm.SortUtil; Y,?kS dS
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/** (6i4N2
* @author treeroot 40O@a:q*
* @since 2006-2-2 q2U?EP{8~
* @version 1.0 32Wa{LG;2
*/ 7NkMr8[}F
public class HeapSort implements SortUtil.Sort{ LbuhKL}VN
KB{IWu
/* (non-Javadoc) Wf~PP;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) VAp 1{
*/ j_.tg7X
public void sort(int[] data) { uR.`8s|
MaxHeap h=new MaxHeap(); 4|UtE<<b
h.init(data); &\ K
for(int i=0;i h.remove(); }L @~!=q*
System.arraycopy(h.queue,1,data,0,data.length); Oq:$GME
} h0C>z2iH
d.Q<!Au3
private static class MaxHeap{ U ]7;K>.T
%'/^[j#
void init(int[] data){ \hdil`{>
this.queue=new int[data.length+1]; p*l=rni4
for(int i=0;i queue[++size]=data; S{Zf}8?6$
fixUp(size); ,u9>c*Ss\
} })j N 8px
} @ V_i%=go
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private int size=0; n(.L=VuXn
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private int[] queue; [<sN"
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public int get() { *;l[|
return queue[1]; 7=s7dYlu
} -"I9`
3_>=Cv}
public void remove() { CSH*^nk':O
SortUtil.swap(queue,1,size--); !b$]D?=}
fixDown(1); I|Mw*2U
} qfRrX"
file://fixdown .*Z#;3
private void fixDown(int k) { .EC~o
int j; Y?-Ef sK
while ((j = k << 1) <= size) { {"*_++|
if (j < size %26amp;%26amp; queue[j] j++; pb G5y7
if (queue[k]>queue[j]) file://不用交换 j=c< Lo`
break; $W9dUR0
SortUtil.swap(queue,j,k); Ya-GDB;L
k = j; Ap 3B'
} Qn.3B
} }*b\=AS=
private void fixUp(int k) { 1~E;@eK'
while (k > 1) { YxGqQO36
int j = k >> 1; _UY=y^ c0>
if (queue[j]>queue[k]) 4O:HT m
break; ,t!I%r
SortUtil.swap(queue,j,k); m}f{o
k = j; !3{. V\P)
} d$8K,-M
} u>:j$@56
+O)ZB$w4
} a5&[O
A-*MH#QUKh
} )-h{0o
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SortUtil： o6:@j#b
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package org.rut.util.algorithm; [Fv_~F491
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import org.rut.util.algorithm.support.BubbleSort; I:0dz:T7*
import org.rut.util.algorithm.support.HeapSort; a-AA$U9hj
import org.rut.util.algorithm.support.ImprovedMergeSort; PR*EyM[T
import org.rut.util.algorithm.support.ImprovedQuickSort; 9< S
import org.rut.util.algorithm.support.InsertSort; u$X =2u:P
import org.rut.util.algorithm.support.MergeSort; I}m>t}QRI_
import org.rut.util.algorithm.support.QuickSort; YN~1.!F
import org.rut.util.algorithm.support.SelectionSort; uJ8FzS>[V
import org.rut.util.algorithm.support.ShellSort; J4s`U/F
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/** Qz"//=hC|H
* @author treeroot 0#ON}l)>
* @since 2006-2-2 J(A+mYr{:
* @version 1.0 KFy|,@NI
*/ PZ#aq~>w
public class SortUtil { >U?#'e{qW
public final static int INSERT = 1; !)}D_9{
public final static int BUBBLE = 2; 1:_}`x=hM
public final static int SELECTION = 3; D |fo:Xp,
public final static int SHELL = 4; Vt-V'`Y
public final static int QUICK = 5; eu?P6>urA
public final static int IMPROVED_QUICK = 6; [{#n?BT
public final static int MERGE = 7; P.(z)!]
public final static int IMPROVED_MERGE = 8; 0DN&HMI#
public final static int HEAP = 9; AS0mMHJk
rB|4
public static void sort(int[] data) { jo<Gf 5
sort(data, IMPROVED_QUICK); 6/vMK<Fz9
} (`u+(M!^
private static String[] name={ .4[M-@4+]
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" ylDfr){
}; @}uo:b:Q
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private static Sort[] impl=new Sort[]{ j&b<YPZ
new InsertSort(), _Y$v=!fY&
new BubbleSort(), <p+7,aE_
new SelectionSort(), RWoVN$i>
new ShellSort(), M'oQ<,yW-
new QuickSort(), Xn5LrLM&
new ImprovedQuickSort(), c{39,oF
new MergeSort(), ]7RK/Zu i
new ImprovedMergeSort(), nA%8 bZ+
new HeapSort() XpA|<s
}; 8ZJ6~~h
Z=<D`
public static String toString(int algorithm){ K6@ %@v
return name[algorithm-1]; FI)0.p
} !!mGsgnW
F5M{`:/
public static void sort(int[] data, int algorithm) { yVJ)JhV
impl[algorithm-1].sort(data); %o`Cp64`Q
} #qJ6iA6{
6Q&i=!fQ
public static interface Sort { &4)PW\ioY
public void sort(int[] data); 0UGAc]!/RZ
} 238z'I+$G/
VTi;y{
public static void swap(int[] data, int i, int j) { @&9<)1F
int temp = data; Tb*Q4:r"
data = data[j]; $-6[9d-N
data[j] = temp; IVeA[qA0
} .Np!Qp1*
} 4 XGEw9`3