[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; )QagS.L{z
} Si9Z>MR
int i1=l; L(>=BK*
int i2=mid+1; ^04Q%,
for(int cur=l;cur<=r;cur++){ P|2E2=G
if(i1==mid+1) u,3,ck!B>@
data[cur]=temp[i2++]; kU-t7'?4
else if(i2>r) IL/Yc1
data[cur]=temp[i1++]; %owsBO+
else if(temp[i1] data[cur]=temp[i1++]; IPSF]"}~
else R1:k23{
data[cur]=temp[i2++]; p Rdk>Ph
} 8mLP5s!7
} y %$O-q
r,goRK.
} <!$:8ls
t%zpNd2lk
改进后的归并排序: lJP1XzN_
R`";Z$~{
package org.rut.util.algorithm.support; R:JX<Ba
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import org.rut.util.algorithm.SortUtil; ,6!rR,0
Mr--4D0Hk
/** SjjIr ^
* @author treeroot q{2I_[p
* @since 2006-2-2 E Uar/
* @version 1.0 wfL-oi'5
*/ M}_i52
public class ImprovedMergeSort implements SortUtil.Sort { _ ~RpGX
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private static final int THRESHOLD = 10; gw`B"c|
@\oz4^
/* &AuF]VT
* (non-Javadoc) < _$%@4 L
* 6ZgU"!|r
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Glq85S
*/ YI-O{U
public void sort(int[] data) { 04%S+y.6&Y
int[] temp=new int[data.length]; .,~(%#Wl$
mergeSort(data,temp,0,data.length-1); f"7M^1)h2%
} N$Y" c*
xR"M*%{@0
private void mergeSort(int[] data, int[] temp, int l, int r) { ; UiwH
int i, j, k; ;Zj]~|
int mid = (l + r) / 2; ]Mj/&b>"e
if (l == r) M@P1,Y
return; 6*l^1;U
if ((mid - l) >= THRESHOLD) zJM S=r
mergeSort(data, temp, l, mid); ;TcvA
else P^MOx4
insertSort(data, l, mid - l + 1); ;o/>JHGj
if ((r - mid) > THRESHOLD) T,fI BD:
mergeSort(data, temp, mid + 1, r); #U=X NU}k
else <]C$xp<2
insertSort(data, mid + 1, r - mid); k{tMzx]F__
)CI1;
for (i = l; i <= mid; i++) { T{]~07N?
temp = data; :RSz4
} ;)Kh;;e
for (j = 1; j <= r - mid; j++) { N3t0-6$_
temp[r - j + 1] = data[j + mid]; 1tCQpf
} +,:^5{9{
int a = temp[l]; + SZYg[
int b = temp[r]; KucV3-I
for (i = l, j = r, k = l; k <= r; k++) { @ZN^1?][
if (a < b) { V&soN:HS
data[k] = temp[i++]; TGuiNobD
a = temp; t3Z_Dp~\
} else { nI*/Mhx
data[k] = temp[j--]; Ub0/r$]DK
b = temp[j]; c4e_6=Iv
} ^^i6|l1
} *BD=O@
} W$JebW<z(
?^' 7+8C*J
/** $d+DDm1o
* @param data 0s#vwK13
* @param l L?_7bXoD
* @param i )f+U~4G&
*/ _a_xzv'
private void insertSort(int[] data, int start, int len) { {^{p,9
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); $=sXAK9
} ;E~4)^
} 6*9}4`
} Z'pQ^MO
} -B#yy]8
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堆排序： ?%Rw(E
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package org.rut.util.algorithm.support; Dz!fpE'L
y`e4;*1
import org.rut.util.algorithm.SortUtil; =U OLT>!
uBg 8h{>
/** wI M{pK
* @author treeroot R8*Q$rH<
* @since 2006-2-2 p6EDQwlf
* @version 1.0 AJt!!crs
*/ CZ2`H[8
public class HeapSort implements SortUtil.Sort{ RVtQ20e";r
-7WW[ w
/* (non-Javadoc) 8pLBt:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) C2]Kc{4
*/ +i `*lBup$
public void sort(int[] data) { T1B|w"In
MaxHeap h=new MaxHeap(); e"-X U@`k1
h.init(data); +ww^ev%
for(int i=0;i h.remove(); kI*(V[i
System.arraycopy(h.queue,1,data,0,data.length); J2GcBzRH
} 7RU}FE
p\wJD1s
private static class MaxHeap{ \^+ILYO:$
MgnM,95
void init(int[] data){ 0?7XtC P<
this.queue=new int[data.length+1]; n9LGP2#!
for(int i=0;i queue[++size]=data; m!XI{F@x
fixUp(size); pl*~kG=
} L^kp8o^$
} ,Y_{L|:w
mOll5O7VW
private int size=0; O(2cWQ
W:&R~R
private int[] queue; iWXc
(lA.3 4.p
public int get() { <dA8 '7^
return queue[1]; k>4qkigjc
} <Pqv;WI|R
5`^o1nGO'
public void remove() { #$S}3 o
SortUtil.swap(queue,1,size--); h4&;?T S
fixDown(1); ~ <0Z>qr
} !Gs} tiMH
file://fixdown CF y}r(q
private void fixDown(int k) { fT:}Lj\L1
int j; .W\ve>;
while ((j = k << 1) <= size) { yT OyDm-
if (j < size %26amp;%26amp; queue[j] j++; 4YG/`P
if (queue[k]>queue[j]) file://不用交换 3{raKM6F
break; T*2C_oW
SortUtil.swap(queue,j,k); KV!<Oq
k = j; huFz97?y(
} yT /EHmJ
} hp!d/X=J_
private void fixUp(int k) { Zp`T
while (k > 1) { :bM+&EP
int j = k >> 1; U0B2WmT~Q
if (queue[j]>queue[k]) ={(j`VSUX0
break; I\P Bu$Ww
SortUtil.swap(queue,j,k); @B1{r|-<^
k = j; ^~ =9
} b=##A
} bPD)D'Hs
IxSV?k
} uq7T{7~<
}amU[U,
} n"{X!(RIcx
U)jUq_LX
SortUtil： Eyh|a.)-
^t.W|teD
package org.rut.util.algorithm; I?Y d
,krS-.
import org.rut.util.algorithm.support.BubbleSort; y%BX]~
import org.rut.util.algorithm.support.HeapSort; .:1qK<vz
import org.rut.util.algorithm.support.ImprovedMergeSort; ,cHU)j
import org.rut.util.algorithm.support.ImprovedQuickSort; 0A$SYF$O+[
import org.rut.util.algorithm.support.InsertSort; ^tAO_~4
import org.rut.util.algorithm.support.MergeSort; w8M2N]&:
import org.rut.util.algorithm.support.QuickSort; q|#MB7e/
import org.rut.util.algorithm.support.SelectionSort; y).P=z
import org.rut.util.algorithm.support.ShellSort; LVtu*k
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/** WO</Q6+
* @author treeroot Q}vbm4)[
* @since 2006-2-2 83;IyvbL
* @version 1.0 s"#]L44N
*/ )q^ Bj$
public class SortUtil { ~uaP$*B[
public final static int INSERT = 1; \P?ToTTV
public final static int BUBBLE = 2; :X>DkRP
public final static int SELECTION = 3; ?X_V#8JK
public final static int SHELL = 4; # mT]j""
public final static int QUICK = 5; 1M5 -pZ[D
public final static int IMPROVED_QUICK = 6; Ek .3
public final static int MERGE = 7; ,+L KJl
public final static int IMPROVED_MERGE = 8; +uQB rG
public final static int HEAP = 9; 7 ^I:=qc72
(!zM\sF
public static void sort(int[] data) { T!^Mvat
sort(data, IMPROVED_QUICK); }5gr5g\OtP
} Aka^e\Y@6*
private static String[] name={ T0|H9>M
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" 4,}GyVJFb`
}; 'V!kL, 9ES
D s-`
private static Sort[] impl=new Sort[]{ =MSu3<y,
new InsertSort(), #ooc)),
new BubbleSort(), |-kEGLH[*V
new SelectionSort(), (([I]q
new ShellSort(), K5flit4-
new QuickSort(), DX@}!6|T
new ImprovedQuickSort(), Jp]T9W\
new MergeSort(), *8\(FVyG^
new ImprovedMergeSort(), {'~sS
new HeapSort() @>O&Cpt
}; \iZ1W
6E+=Xi
public static String toString(int algorithm){ 9*pG?3*I
return name[algorithm-1]; epVH.u%
} -CU,z|g+
T-P@u-DU
public static void sort(int[] data, int algorithm) { L>nO:`>h
impl[algorithm-1].sort(data); X<xqT
} < l[`"0
`pYE[y+
public static interface Sort { eTZ`q_LfI1
public void sort(int[] data); q<XcOc5
} (3fPt;U
/=M.-MU2
public static void swap(int[] data, int i, int j) { 3wNN<R
int temp = data; qJMp1DC
data = data[j]; oNSz&)LP
data[j] = temp; a;p6?kv
} nHU3%%%cU
} #$uZDQY_