[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; .Wi{lt
} 20rkKFk*
int i1=l; {G*A.$-d
int i2=mid+1; >u%]6_[
for(int cur=l;cur<=r;cur++){ f.GETw
if(i1==mid+1) a{Esw`
data[cur]=temp[i2++]; 3?E8\^N\n
else if(i2>r) V#ev-\k}@
data[cur]=temp[i1++]; -G,^1AL>
else if(temp[i1] data[cur]=temp[i1++]; [Pe#kzLX
else $(Ugtimdv
data[cur]=temp[i2++]; fri0XxF
} R_sC! -
} BK,sc'b
x_|F|9
} ":3 VJ(eY
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改进后的归并排序: drwgjLC+
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package org.rut.util.algorithm.support; x{}z ;yG
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import org.rut.util.algorithm.SortUtil; 9dh>l!2
`IINq{Zk
/** FI8Oz,
* @author treeroot fQ+VT|jzx
* @since 2006-2-2 [~D|peM3
* @version 1.0 :`)~-`_
*/ M\b")Tu{0
public class ImprovedMergeSort implements SortUtil.Sort { PN+G:Qv
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private static final int THRESHOLD = 10; \RQ='/H*
}Vu\(~
/* (SVWdgb
* (non-Javadoc) -oz`"&%
* ]<DNo&fw
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9]$8MY
*/ ,D6v4<jh
public void sort(int[] data) { ')S;[=v
int[] temp=new int[data.length]; vhr+g 'tf
mergeSort(data,temp,0,data.length-1); 6{d6s#|%
} U-wLt(Y<
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private void mergeSort(int[] data, int[] temp, int l, int r) { EPW7+Ve
int i, j, k; c':ezEaC
int mid = (l + r) / 2; o A*G
if (l == r) g=}v>[k E
return; J` {6l
if ((mid - l) >= THRESHOLD) +a= 0\lpOy
mergeSort(data, temp, l, mid); +kdySWF
else mxSKG> O
insertSort(data, l, mid - l + 1); !0/z>#b
if ((r - mid) > THRESHOLD) !~<siy
mergeSort(data, temp, mid + 1, r); IGX:H)&*
else ,(G%e
insertSort(data, mid + 1, r - mid); f]~c)P Cs
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for (i = l; i <= mid; i++) { tNs~M4TVVH
temp = data; &K^MNd
} `P+(&taT
for (j = 1; j <= r - mid; j++) { R4%P:qM
temp[r - j + 1] = data[j + mid]; 9+YD!y
} 5H,G-
int a = temp[l]; M ixwK,
int b = temp[r]; >zY \Llv
for (i = l, j = r, k = l; k <= r; k++) { F)$K
if (a < b) { o?Sla_D
data[k] = temp[i++]; ;@ WV-bLe
a = temp; WKA'=,`v
} else { D 7shiv|,
data[k] = temp[j--]; J3S&3+2G
b = temp[j]; Mu_i$j$vvP
} T#:F]=
} vd#,DU=p!
} LU!1s@
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/** ")s!L"x
* @param data d_}a`H
* @param l HW=xvA+
* @param i "C%!8`K{a*
*/ cTZ)"^z!
private void insertSort(int[] data, int start, int len) { b'>8ZIY
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); ;i#LIHJ
} %IpSK 0<Sp
} <2
} ?BCyJ
} MBk"KF
;'RFo?u K
堆排序： }F`beoMAkM
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package org.rut.util.algorithm.support; [UPNd!sy
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import org.rut.util.algorithm.SortUtil; P`s(kIe
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/** DOD6Liau{Q
* @author treeroot =.m6FRsU
* @since 2006-2-2 X<Za9
* @version 1.0 b5ie <s
*/ UPCQs",
public class HeapSort implements SortUtil.Sort{ coQ[@vu
){Z
/* (non-Javadoc) G=M] 8+h
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vW.%[]
*/ .+#Lx;})
public void sort(int[] data) { 1czG55 |
MaxHeap h=new MaxHeap(); d5xxb _oE
h.init(data); KS!yT_O
for(int i=0;i h.remove(); ui.'^F<
System.arraycopy(h.queue,1,data,0,data.length); ;?9A(q_Z
} 7#4%\f+'t
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private static class MaxHeap{ 0*(K DDv
MUof=EJg>u
void init(int[] data){ +}!DP~y+
this.queue=new int[data.length+1]; }X1.Wt=?
for(int i=0;i queue[++size]=data; M|CrBJv+F
fixUp(size); 2tr :xi@
} $>vy(Y
} m^$5K's&
qMgfMhQ7DU
private int size=0; hN4VlNKu
'_Wt}{h
private int[] queue; #MTj)P,
, p0KLU\-
public int get() { EnscDtf(
return queue[1]; <*@~n- R$
} $^vP<
;e;\q;GP
public void remove() { >_Uj?F:
SortUtil.swap(queue,1,size--); }z'DWp=uN
fixDown(1); Tx+ p8J|Yr
} g5R,% 6
file://fixdown #4y,a_)
private void fixDown(int k) { A o3HX
int j; 1k>naf~O
while ((j = k << 1) <= size) { gg8c7d:Q
if (j < size %26amp;%26amp; queue[j] j++; GJak.,0t
if (queue[k]>queue[j]) file://不用交换 .)ST[G]WK
break; O<`R~
SortUtil.swap(queue,j,k); F!CAitxd
k = j; Dr'sIH^
} [,7-w
} S[U/qO)m
private void fixUp(int k) { D9^7m j?e
while (k > 1) { Z\!rH"8
int j = k >> 1; *( *z|2
if (queue[j]>queue[k]) 7Dl%UG]
break; <ZrFOb
SortUtil.swap(queue,j,k); hPPB45^
k = j; 8IWwjyRr
} *CUdGI&
} vvh.@f
;5M<j3_*
} b7'F|h^
h*'d;_(,
} }J;~P 9Y
]31$KBC
SortUtil： F50JJZ
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package org.rut.util.algorithm; ;f(n.i
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import org.rut.util.algorithm.support.BubbleSort; $I(}r3r
import org.rut.util.algorithm.support.HeapSort; ;C_ >
import org.rut.util.algorithm.support.ImprovedMergeSort; *aG"+c6|
import org.rut.util.algorithm.support.ImprovedQuickSort; G;2[
import org.rut.util.algorithm.support.InsertSort; p"KV*D9b
import org.rut.util.algorithm.support.MergeSort; h2&y<Eg>
import org.rut.util.algorithm.support.QuickSort; Vi,Y@+4
import org.rut.util.algorithm.support.SelectionSort; Y`]rj-8f0B
import org.rut.util.algorithm.support.ShellSort; ,eK2I Ao
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/** $`Rxn*}V4#
* @author treeroot #7C6yXb%
* @since 2006-2-2 VKf6|ae
* @version 1.0 BvI 0v:
*/ CXa Ld7nMX
public class SortUtil { Oo/8Y E@
public final static int INSERT = 1; cKpQr7]ur
public final static int BUBBLE = 2; AY@k-4
public final static int SELECTION = 3; 5Jd` ^U
public final static int SHELL = 4; ;*`_#Rn#
public final static int QUICK = 5; -R74/GBg
public final static int IMPROVED_QUICK = 6; OequU'j
public final static int MERGE = 7; )]}$
public final static int IMPROVED_MERGE = 8; t[q3{-
public final static int HEAP = 9; ER2V*,n@
7V/Zr
public static void sort(int[] data) { I}ndRDz[
sort(data, IMPROVED_QUICK); .pKN4
} 0lf"w@/
private static String[] name={ e#m1X6$.e
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" r"[L0Cbb
}; fU`T\
UhBz<>i;!
private static Sort[] impl=new Sort[]{ |DGCdB|`G
new InsertSort(), :W%4*-FP
new BubbleSort(), 7H?!RYrx
new SelectionSort(), _0*=u$~R
new ShellSort(), ,L~snR'w
new QuickSort(), 'yeh7oR
new ImprovedQuickSort(), g6`.qyVfz'
new MergeSort(), oo'iwq-\
new ImprovedMergeSort(), |} 9GHjG
new HeapSort() VHj*aBHB
}; kw;wlFU;
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public static String toString(int algorithm){ 4zwif&
return name[algorithm-1]; 5Ny0b|+p
} 6<+8}`@B>G
X;5S
public static void sort(int[] data, int algorithm) { vS2(Q0+TZi
impl[algorithm-1].sort(data); rSbQ}O4V
} >["Kd.ye
Y& m<lnB
public static interface Sort { hN}5u"pS
public void sort(int[] data); &#%D.@L
} [@zkv)D6
)Jmw|B
public static void swap(int[] data, int i, int j) { 8vu2k>
int temp = data; vo.EM1x
data = data[j]; 78gob&p?
data[j] = temp; eNivlJ,K|@
} <%(f9j
} 7%X+O8