[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; g,YF$:e
} BPW.&2?<
int i1=l; V+sZ;$
int i2=mid+1; nO6UlY
for(int cur=l;cur<=r;cur++){ IG}yGGn
if(i1==mid+1) 4Kj8i
data[cur]=temp[i2++]; qYe`</
else if(i2>r) L=#B>Eu
data[cur]=temp[i1++]; s'tXb=!HO
else if(temp[i1] data[cur]=temp[i1++]; \``w>Xy8
else F',1R"/}
data[cur]=temp[i2++]; z I9jxwXU
} ysp,:)-%G@
} fMf;
s3ASA.*
} +-t&li%F
(Q `Ps/
改进后的归并排序: x^[0UA]S9
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package org.rut.util.algorithm.support; cJm},
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import org.rut.util.algorithm.SortUtil; K ..Pn17t
l8M}82_
/** 'Eia=@
* @author treeroot DfkGNBY
* @since 2006-2-2 @CR<&^s5V
* @version 1.0 #l)o<Z
*/ wk'(g_DP
public class ImprovedMergeSort implements SortUtil.Sort { 3:sc%IDP
1A;,"8kBd
private static final int THRESHOLD = 10; XH0Vs.w
c;29GHs2
/* HIj:?y
* (non-Javadoc) o|84yT!~
* A0.xPru1p
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) o^uh3,.
*/ Ia9!ucN7DA
public void sort(int[] data) { ?o]NV
int[] temp=new int[data.length]; (u8OTq@
mergeSort(data,temp,0,data.length-1); Wvd-be
} &2y9J2aA
'Q7t5v@FF
private void mergeSort(int[] data, int[] temp, int l, int r) { jfvlkE-uK
int i, j, k; P-^-~/>n
int mid = (l + r) / 2; Lo[;{A$u
if (l == r) ='Oxy
return; (Ww SisC~
if ((mid - l) >= THRESHOLD) 4,)QV_?
mergeSort(data, temp, l, mid); # NK{]H$fd
else #"C*dNAB
insertSort(data, l, mid - l + 1); ~h+B&F+5
if ((r - mid) > THRESHOLD) =fy.'+
mergeSort(data, temp, mid + 1, r); ]t17= Lr?
else 1G(wESe
insertSort(data, mid + 1, r - mid); 2,|@a\H
G'HLnx}Yi
for (i = l; i <= mid; i++) { N1n\tA?
temp = data; 5M8
} Pa; *%7
for (j = 1; j <= r - mid; j++) { Cx) N;x
temp[r - j + 1] = data[j + mid]; h4slQq~K
} )=N.z6?
int a = temp[l]; h_Er$ZT64
int b = temp[r]; >9g^-~X;v
for (i = l, j = r, k = l; k <= r; k++) { E/% F0\B
if (a < b) { w3>G3=b
data[k] = temp[i++]; KJ-Q$ M
a = temp; (a,`Y.
} else { 0icB2Jm:D}
data[k] = temp[j--]; JO87rG
b = temp[j]; s.Mrd~(Drz
} 03 v\v9<T
} #s}tH$MT#
} =/xXB
f|!@H><
/** {qry2ZT5
* @param data LM.#~7jC
* @param l jNIz:_c-~
* @param i !P6y_Frpe
*/ ri9n.-xs
private void insertSort(int[] data, int start, int len) { Eh`W J~
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); M9yqJPS}B
} #TP Y%
} G0r(xP?
} ,5sv;
} {5fq4AA6
noT}NX%
堆排序： zzKU s"u
127@ TN"
package org.rut.util.algorithm.support; QX-M'ur99
~vR<UQz
import org.rut.util.algorithm.SortUtil; ;ZrFy=Iv
5kv]k?
/** "bjbJC&T
* @author treeroot 6~k qU4lL
* @since 2006-2-2 P_@ty~u
* @version 1.0 M?$tHA~OX
*/ 52 DSKL
public class HeapSort implements SortUtil.Sort{ O#U_mgfzJ
4vH.B)S-
/* (non-Javadoc) 6>EoU-YX}l
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =\<!kJ\yH
*/ OBPiLCq
public void sort(int[] data) { twTRw:.!f
MaxHeap h=new MaxHeap(); 5bWy=Xk B
h.init(data); {\=NZ\
for(int i=0;i h.remove(); r2Q) Q
System.arraycopy(h.queue,1,data,0,data.length); Lhgs|*M
} C4C!-12
TF,a`?c`
private static class MaxHeap{ Od]wh
c$3ZEe
void init(int[] data){ 6Qm .k$[
this.queue=new int[data.length+1]; dnX^?
for(int i=0;i queue[++size]=data; ui^v.YCMI
fixUp(size); *\wf(o>Q
} K;f=l5
} A`b )7+mB
}% ?WS
private int size=0; ;77q~_g$
A'? W5~F
private int[] queue; D-5~CK4`
~/R}K g(
public int get() { xWty2/!h
return queue[1]; 0h2MmI#
} [WunA,IuR
<=~'Pd-f(
public void remove() { 5z:/d`P[
SortUtil.swap(queue,1,size--); %gx>|
fixDown(1); tgm(tDL
} Yf^/YLLS
file://fixdown O[')[uo8s
private void fixDown(int k) { gq?~*4H
int j; n%P,"V
while ((j = k << 1) <= size) { Rv+p4RgA
if (j < size %26amp;%26amp; queue[j] j++; ?x =Sm|Ej
if (queue[k]>queue[j]) file://不用交换 Fd0\T#k
break; ^TY8,qDA
SortUtil.swap(queue,j,k); SVyJUd_
k = j; =}4lx^`oeT
} l'Z `%}R
} 3_k3U
private void fixUp(int k) { N_8L8ds5
while (k > 1) { [$GQ]Y
int j = k >> 1; 2$QuR~
if (queue[j]>queue[k]) t!vlZNc
break; x1*@PiO,.
SortUtil.swap(queue,j,k); Z{.L_]$I
k = j; \U'TL_Ql
} 5'O.l$)y
} u&Dd9kMz
iJK rNRj
} 4K*DEVS
]z/
} 'Xzi$}E D
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SortUtil： nnO@$T
g|l|)T.s
package org.rut.util.algorithm; +^.Q%b0Xx
/T2f~1R
import org.rut.util.algorithm.support.BubbleSort; j~Xn\~*n
import org.rut.util.algorithm.support.HeapSort; [Z?vC
import org.rut.util.algorithm.support.ImprovedMergeSort; ?rH=<#@
import org.rut.util.algorithm.support.ImprovedQuickSort; ]^\+B4
import org.rut.util.algorithm.support.InsertSort; =!Y{Mz
import org.rut.util.algorithm.support.MergeSort; 6hm6h7$F1
import org.rut.util.algorithm.support.QuickSort; gb0ZGnI
import org.rut.util.algorithm.support.SelectionSort; &U/~*{
import org.rut.util.algorithm.support.ShellSort; QCWk[Gx
cB[.ET$
/** 4)nQBFX
* @author treeroot *:A)j?(
* @since 2006-2-2 `Lu\zR%<
* @version 1.0 }UWRH.;v
*/ eL!G, W
public class SortUtil { /C}fE]n{X
public final static int INSERT = 1; Kq0hT4w
public final static int BUBBLE = 2; J#W>%2"s
public final static int SELECTION = 3; L:F:ZOM6`
public final static int SHELL = 4; jNNl5.
public final static int QUICK = 5; t|zLR
public final static int IMPROVED_QUICK = 6; 6Gs,-Kb:
public final static int MERGE = 7; Cx/duodp
public final static int IMPROVED_MERGE = 8; ^5~[G%G4
public final static int HEAP = 9; S.OGLLprp
jQ31u
public static void sort(int[] data) { $rC`)"t
sort(data, IMPROVED_QUICK); DDhc^(
} h@D4~(r
private static String[] name={ 9?W38EF
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" ;nJCd1H
}; )FqE8oN-
3?uP$(l
private static Sort[] impl=new Sort[]{ ",rA
new InsertSort(), '[#uf/~W
new BubbleSort(), P5P<-T{-c
new SelectionSort(), n1W}h@>8
new ShellSort(), :r/rByd'
new QuickSort(), _n{6/
new ImprovedQuickSort(), Cst>'g-yB
new MergeSort(), }J$PO*Q@'
new ImprovedMergeSort(), n%<.,(.(S
new HeapSort() zj;y`ENj
}; F<w/@.&m
#zt+U^#)
public static String toString(int algorithm){ vP'R7r2Yx
return name[algorithm-1]; 3-8Vw$u
} {UYqRfgbZ
uyG4zV\h*
public static void sort(int[] data, int algorithm) { $P@P}%2
impl[algorithm-1].sort(data); q+o(`N'~G
} MU&5&)m
"v3u$-xN1
public static interface Sort { aV(*BE/@F
public void sort(int[] data); lv ^=g
} I/)dXk~
{+t'XkA
public static void swap(int[] data, int i, int j) { ~ab"q%
int temp = data; {hRAR8
data = data[j]; Qg _?..%
data[j] = temp; O!]wJ
} Z9aDE@A
} r%'2a+}D