This commit is contained in:
Looly 2019-09-09 21:58:13 +08:00
parent 7174b49906
commit 692397f313
5 changed files with 48 additions and 29 deletions

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@ -20,6 +20,7 @@
### Bug修复
* 【core】 修复NetUtil.getUsableLocalPort问题pr#69@Gitee
* 【core】 修复MathUtil.arrangementSelect重复元素导致无结果问题issue#529@Gitee
-------------------------------------------------------------------------------------------------------------

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@ -5,6 +5,7 @@ import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import cn.hutool.core.util.ArrayUtil;
import cn.hutool.core.util.NumberUtil;
/**
@ -14,7 +15,7 @@ import cn.hutool.core.util.NumberUtil;
* @author looly
* @since 4.0.7
*/
public class Arrangement implements Serializable{
public class Arrangement implements Serializable {
private static final long serialVersionUID = 1L;
private String[] datas;
@ -27,7 +28,7 @@ public class Arrangement implements Serializable{
public Arrangement(String[] datas) {
this.datas = datas;
}
/**
* 计算排列数即A(n, n) = n!
*
@ -46,12 +47,12 @@ public class Arrangement implements Serializable{
* @return 排列数
*/
public static long count(int n, int m) {
if(n == m) {
if (n == m) {
return NumberUtil.factorial(n);
}
return (n > m) ? NumberUtil.factorial(n, n - m) : 0;
}
/**
* 计算排列总数即A(n, 1) + A(n, 2) + A(n, 3)...
*
@ -60,14 +61,15 @@ public class Arrangement implements Serializable{
*/
public static long countAll(int n) {
long total = 0;
for(int i = 1; i <= n; i++) {
for (int i = 1; i <= n; i++) {
total += count(n, i);
}
return total;
}
/**
* 全排列选择列表全部参与排列
*
* @return 所有排列列表
*/
public List<String[]> select() {
@ -82,52 +84,45 @@ public class Arrangement implements Serializable{
*/
public List<String[]> select(int m) {
final List<String[]> result = new ArrayList<>((int) count(this.datas.length, m));
select(new String[m], 0, result);
select(this.datas, new String[m], 0, result);
return result;
}
/**
* 排列所有组合即A(n, 1) + A(n, 2) + A(n, 3)...
*
* @return 全排列结果
*/
public List<String[]> selectAll(){
final List<String[]> result = new ArrayList<>((int)countAll(this.datas.length));
for(int i = 1; i <= this.datas.length; i++) {
public List<String[]> selectAll() {
final List<String[]> result = new ArrayList<>((int) countAll(this.datas.length));
for (int i = 1; i <= this.datas.length; i++) {
result.addAll(select(i));
}
return result;
}
/**
* 排列选择
* 排列选择<br>
* 排列方式为先从数据数组中取出一个元素再把剩余的元素作为新的基数依次列推直到选择到足够的元素
*
* @param datas 选择的基数
* @param dataList 待选列表
* @param resultList 前面resultIndex-1个的排列结果
* @param resultIndex 选择索引从0开始
* @param result 最终结果
*/
private void select(String[] resultList, int resultIndex, List<String[]> result) {
int resultLen = resultList.length;
if (resultIndex >= resultLen) { // 全部选择完时输出排列结果
result.add(Arrays.copyOf(resultList, resultList.length));
private void select(String[] datas, String[] resultList, int resultIndex, List<String[]> result) {
if (resultIndex >= resultList.length) { // 全部选择完时输出排列结果
if (false == result.contains(resultList)) {
result.add(Arrays.copyOf(resultList, resultList.length));
}
return;
}
// 递归选择下一个
for (int i = 0; i < datas.length; i++) {
// 判断待选项是否存在于排列结果中
boolean exists = false;
for (int j = 0; j < resultIndex; j++) {
if (datas[i].equals(resultList[j])) {
exists = true;
break;
}
}
if (false == exists) { // 排列结果不存在该项才可选择
resultList[resultIndex] = datas[i];
select(resultList, resultIndex + 1, result);
}
resultList[resultIndex] = datas[i];
select(ArrayUtil.remove(datas, i), resultList, resultIndex + 1, result);
}
}
}

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@ -3,8 +3,11 @@ package cn.hutool.core.math;
import java.util.List;
import org.junit.Assert;
import org.junit.Ignore;
import org.junit.Test;
import cn.hutool.core.lang.Console;
/**
* 排列单元测试
* @author looly
@ -51,4 +54,13 @@ public class ArrangementTest {
List<String[]> list2 = arrangement.select(0);
Assert.assertTrue(1 == list2.size());
}
@Test
@Ignore
public void selectTest2() {
List<String[]> list = MathUtil.arrangementSelect(new String[] { "1", "1", "3", "4" });
for (String[] strings : list) {
Console.log(strings);
}
}
}

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@ -483,6 +483,17 @@ public class ExcelWriter extends ExcelBase<ExcelWriter> {
}
return this;
}
/**
* 设置默认行高值为一个点的高度
*
* @param height 高度
* @return this
* @since 4.6.5
*/
public ExcelWriter setDefaultRowHeight(int height) {
return setRowHeight(-1, height);
}
/**
* 设置行高值为一个点的高度

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@ -75,7 +75,7 @@ public class ExcelWriteTest {
rows.add(ObjectUtil.clone(row1));
}
String filePath = "e:/writeTest.xlsx";
String filePath = "f:/test/writeTest.xlsx";
FileUtil.del(filePath);
// 通过工具类创建writer
ExcelWriter writer = ExcelUtil.getWriter(filePath);