[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; (_*5oj-
} X*Dj[TD]
int i1=l; W4U@%b do
int i2=mid+1; lGk{LO)
for(int cur=l;cur<=r;cur++){ pY~,(s|Qb
if(i1==mid+1) n;p:=\uN
data[cur]=temp[i2++]; T<@cd|`
else if(i2>r) Fxqp-}:
data[cur]=temp[i1++]; "+ >SJ~
else if(temp[i1] data[cur]=temp[i1++]; ~$f;U
else f{i8w!O"~
data[cur]=temp[i2++]; UH>F|3"d
} a/U2xq{x
} M$d%p6Cv
G4;3cT3'
} ?N=m<fn
Cb@3M"1:
改进后的归并排序: drd/jH&
)r z+'|,
package org.rut.util.algorithm.support; /c-r
^/=#UQ*k
import org.rut.util.algorithm.SortUtil; UMp/\&0
A@D2+fS
/** 3 M10fI?
* @author treeroot ym/fFm6h
* @since 2006-2-2 Q33"u/-v
* @version 1.0 %#Z/2<_
*/ TO*BH^5R
public class ImprovedMergeSort implements SortUtil.Sort { ^o@,3__7Q
Y<b-9ai<w
private static final int THRESHOLD = 10; iy\nio`
st&
/* 2Nm>5l
* (non-Javadoc) \U?n+6 7g
* 1s*.A6EP"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ',4x$qe
*/ d:q +
public void sort(int[] data) { G633Lm`ri
int[] temp=new int[data.length]; ;HBCUe<_
mergeSort(data,temp,0,data.length-1); 7HJS.047
} 9F- )r'
ai^4'{#zi
private void mergeSort(int[] data, int[] temp, int l, int r) { lJs<
int i, j, k; /?6|&
int mid = (l + r) / 2; Af5D>/
if (l == r) {[t`j+J
return; j9U%7u]-k
if ((mid - l) >= THRESHOLD) qXW})(
mergeSort(data, temp, l, mid); J.+BD\pa
else 8; R|
insertSort(data, l, mid - l + 1); V~yAE@9
if ((r - mid) > THRESHOLD) XJ+6FT/qss
mergeSort(data, temp, mid + 1, r); %77p5ctW
else @[?!s%*2
insertSort(data, mid + 1, r - mid); nGf);U#K
u@P[Vb
for (i = l; i <= mid; i++) { >Aq870n
temp = data; EIbXmkHl<
} BtdXv4V
for (j = 1; j <= r - mid; j++) { GOB(#vu
temp[r - j + 1] = data[j + mid]; 4Kv[e]10(
} F;!2(sPS
int a = temp[l]; Q U F$@)A
int b = temp[r]; W*:,m8wk
for (i = l, j = r, k = l; k <= r; k++) { LFp]7Dq
if (a < b) { .LRxP#B
data[k] = temp[i++]; 3PUAH
a = temp; E%TpJl'U
} else { m&oi8 P-6
data[k] = temp[j--]; x/MZ(A%D
b = temp[j]; ^D_/=4rz8
} *Sf-;U
} &>jAe_{",
} QIn/,Yd
"4j:[9vR\
/** rba;&D;
* @param data }T0K^Oe+eS
* @param l p(m1O70C
* @param i qy!Ou3^
*/ YIp-Y}6
private void insertSort(int[] data, int start, int len) { wj|x:YZ*
for(int i=start+1;i for(int j=i;(j>start) %26amp;%26amp; data[j] SortUtil.swap(data,j,j-1); zMK](o1Vj
} 0i8hI6d
} oXt,e
} =`C4qC_
} DV]7.Bm
A?"h@-~2
堆排序： UU}7U]9u
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package org.rut.util.algorithm.support; <;t)6:N\
r\9TMg`C
import org.rut.util.algorithm.SortUtil; td-3h,\\
n1:v HBM@\
/** -,":5V26
* @author treeroot i"^<CR@e
* @since 2006-2-2 ;;gK@?hJ
* @version 1.0 c| ' w
*/ }GnwY97
public class HeapSort implements SortUtil.Sort{ :H[\;Z1_
f.pkQe(
/* (non-Javadoc) `Xcirfp
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) QI!i
*/ #S+Z$DQD
public void sort(int[] data) { L8vOBI7N
MaxHeap h=new MaxHeap(); m^\TUj
h.init(data); 4`2$_T$F
for(int i=0;i h.remove(); P8gXCX!>U
System.arraycopy(h.queue,1,data,0,data.length); x@cN3O
} K,}w]b
~%|G+m>
private static class MaxHeap{ xQlT%X;'
H.J5i~s
void init(int[] data){ fRg=!<#%
this.queue=new int[data.length+1]; 8<)$z?K
for(int i=0;i queue[++size]=data; Oz:ZQ M
fixUp(size); yNJAWM7
} a~^Srj!}x
} =O{~Q3z@s
X`\:_|
private int size=0; 9g?xlue#?
%W|DJ\l8"
private int[] queue; Dd2Lx&9
"t&{yBQ0u
public int get() { KLt%[$CTi
return queue[1]; ij&p4
} tnW;E\cR
VKLU0*2R
public void remove() { ~j,TVY
SortUtil.swap(queue,1,size--); C'9 1d7E
fixDown(1); +3bfD
} ? Ekq6uz\)
file://fixdown 1}`LTPW9
private void fixDown(int k) { RyRqH:p)3
int j; ~' =lou
while ((j = k << 1) <= size) { voRfjsS~
if (j < size %26amp;%26amp; queue[j] j++; <qiICb)~
if (queue[k]>queue[j]) file://不用交换 DB&SOe
break; :?r*p>0$
SortUtil.swap(queue,j,k); (@ea|Fd#4
k = j; g^o_\hp
} `.k5v7!o
} -%uy63LbHF
private void fixUp(int k) { 5&4F,v[zp
while (k > 1) { yCM{M
int j = k >> 1; 4&}\BU*
if (queue[j]>queue[k]) dB|Te"6
break; u2`xC4>c
SortUtil.swap(queue,j,k); 8g5V,3_6
k = j; gB CC
} {>.>7{7
} S+*cbA{J|
4IGxI7~27#
} T=? bdIl
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} iiwpSGFl]
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SortUtil： ,eELRzjl
uU+s!C9r
package org.rut.util.algorithm; \!X?zR_
j3P RAe
import org.rut.util.algorithm.support.BubbleSort; Rx. rj~
import org.rut.util.algorithm.support.HeapSort; tmxPOe
import org.rut.util.algorithm.support.ImprovedMergeSort; BpXEK.Xw
import org.rut.util.algorithm.support.ImprovedQuickSort; HRRngk#lV
import org.rut.util.algorithm.support.InsertSort; f0F#Yi{fw
import org.rut.util.algorithm.support.MergeSort; VA]ZR+m
import org.rut.util.algorithm.support.QuickSort; _XN~@5elrC
import org.rut.util.algorithm.support.SelectionSort; F|]rA*2u
import org.rut.util.algorithm.support.ShellSort; 9c5!\m1
oBUh]sR{.
/** &8Wlps`
* @author treeroot ]b\WaS8I
* @since 2006-2-2 ip5u_Xj?
* @version 1.0 0e9A+&r
*/ @dhH;gt.I
public class SortUtil { H5q:z=A
public final static int INSERT = 1; Nzc>)2% N
public final static int BUBBLE = 2; 59qnEIi
public final static int SELECTION = 3; GHrBK&
public final static int SHELL = 4; jg^^\n
public final static int QUICK = 5; mSj76'L#
public final static int IMPROVED_QUICK = 6; /lUk5g^j
public final static int MERGE = 7; /Y^7Rl
public final static int IMPROVED_MERGE = 8; c20|Cx2m
public final static int HEAP = 9; .5k^f5a
xDe47&qKM
public static void sort(int[] data) { ]EX--d<_`
sort(data, IMPROVED_QUICK); 7+]F^ 6
} B=x~L
private static String[] name={ T.euoFU{Z
"insert", "bubble", "selection", "shell", "quick", "improved_quick", "merge", "improved_merge", "heap" k*9%8yi_ U
}; {1HB!@%,(
rH^/8|}&s
private static Sort[] impl=new Sort[]{ "11j$E9#\n
new InsertSort(), <d<RK@2-
new BubbleSort(), 9_`3IJ
new SelectionSort(), :,=Fx</H
new ShellSort(), '!j(u@&!
new QuickSort(), >?Qxpqf2
new ImprovedQuickSort(), +wjlAqMQ
new MergeSort(), ]J~g'">
new ImprovedMergeSort(), 0eaUorm)
new HeapSort() ^AH-+#5
}; wO\!xW:
W)
public static String toString(int algorithm){ *%f3rvt7@)
return name[algorithm-1]; 'v`~(9'Rcj
} G32_FQ$b
k%a?SU<f
public static void sort(int[] data, int algorithm) { x_pMG!2
impl[algorithm-1].sort(data); ;op'V6iG
} _PdAN= C3
1uj05aZh}
public static interface Sort { c; d"XiA
public void sort(int[] data); zrTY1Asw;4
} n K0hTQ
X!?wL0n
public static void swap(int[] data, int i, int j) { yL4 -4
int temp = data; ?-M)54b\
data = data[j]; Cg?I'1]o6
data[j] = temp; K;kLQ2)
} /T4VJ{D
} }W)Mwu'W