Java 如何在不使用集合的情况下洗牌字符串中的字符。洗牌(…)?
如何洗牌字符串中的字符(例如,hello可以是ehlol或lleoh或…)。我不想使用Collections.shuffle(…)方法,有更简单的方法吗?我不知道更简单的方法。但是,您可以使用Math.rand()功能在角色长度范围内生成一个随机数,而无需替换,这将给您一个无序输出Java 如何在不使用集合的情况下洗牌字符串中的字符。洗牌(…)?,java,string,shuffle,Java,String,Shuffle,如何洗牌字符串中的字符(例如,hello可以是ehlol或lleoh或…)。我不想使用Collections.shuffle(…)方法,有更简单的方法吗?我不知道更简单的方法。但是,您可以使用Math.rand()功能在角色长度范围内生成一个随机数,而无需替换,这将给您一个无序输出 public class Shuffle { public static void main(String[] args) { Shuffle s = new Shuffle();
public class Shuffle {
public static void main(String[] args) {
Shuffle s = new Shuffle();
s.shuffle("hello");
}
public void shuffle(String input){
List<Character> characters = new ArrayList<Character>();
for(char c:input.toCharArray()){
characters.add(c);
}
StringBuilder output = new StringBuilder(input.length());
while(characters.size()!=0){
int randPicker = (int)(Math.random()*characters.size());
output.append(characters.remove(randPicker));
}
System.out.println(output.toString());
}
}
/*
Sample outputs
hlleo
llheo
leohl
lleho
*/
公共类洗牌{
公共静态void main(字符串[]args){
洗牌s=新洗牌();
s、 洗牌(“你好”);
}
公共无效洗牌(字符串输入){
列表字符=新的ArrayList();
for(char c:input.toCharArray()){
字符。添加(c);
}
StringBuilder输出=新的StringBuilder(input.length());
while(characters.size()!=0){
int randPicker=(int)(Math.random()*characters.size());
output.append(characters.remove(randPicker));
}
System.out.println(output.toString());
}
}
/*
样本输出
赫利奥
伊洛
莱奥尔
卢埃霍
*/
您可以迭代所有字符,将每个字符与下一个字符进行比较。然后,如果Math.rand()>0.5将此字符与下一个字符交换,否则继续下一个字符。例如:
static String shuffle(String text){
if (text.length()<=1)
return text;
int split=text.length()/2;
String temp1=shuffle(text.substring(0,split));
String temp2=shuffle(text.substring(split));
if (Math.random() > 0.5)
return temp1 + temp2;
else
return temp2 + temp1;
}
静态字符串洗牌(字符串文本){
if(text.length()0.5)
返回temp1+temp2;
其他的
返回temp2+temp1;
}
输出:
啊哈哈性能不是很好,但在我看来还是可读的:
public static String shuffleString(String string)
{
List<String> letters = Arrays.asList(string.split(""));
Collections.shuffle(letters);
String shuffled = "";
for (String letter : letters) {
shuffled += letter;
}
return shuffled;
}
公共静态字符串shufflesting(字符串)
{
列表字母=array.asList(string.split(“”);
收藏。洗牌(字母);
字符串洗牌=”;
for(字符串字母:字母){
洗牌+=字母;
}
换位;
}
以下代码既不需要递归,也不需要转换为集合
public static String shuffle(String string) {
StringBuilder sb = new StringBuilder(string.length());
double rnd;
for (char c: string.toCharArray()) {
rnd = Math.random();
if (rnd < 0.34)
sb.append(c);
else if (rnd < 0.67)
sb.insert(sb.length() / 2, c);
else
sb.insert(0, c);
}
return sb.toString();
}
publicstaticstringshuffle(字符串){
StringBuilder sb=新的StringBuilder(string.length());
双rnd;
for(char c:string.toCharArray()){
rnd=数学随机();
如果(rnd<0.34)
sb.附加(c);
否则如果(rnd<0.67)
sb.插入(sb.长度()/2,c);
其他的
sb.插入(0,c);
}
使某人返回字符串();
}
不知道为什么你不想使用shuffle,除非是为了上学。;)
如果您关心性能,那么您肯定不能使用任何将字符串与“+”连接起来的解决方案
以下是我能想到的最简洁的解决方案:
public static String shuffle(String string) {
if (StringUtils.isBlank(string) {
return string;
}
final List<Character> randomChars = new ArrayList<>();
CollectionUtils.addAll(randomChars, ArrayUtils.toObject(string.toCharArray()));
Collections.shuffle(randomChars);
return StringUtils.join(randomChars, "");
}
publicstaticstringshuffle(字符串){
if(StringUtils.isBlank)(字符串){
返回字符串;
}
最终列表randomChars=新的ArrayList();
CollectionUtils.addAll(randomChars、ArrayUtils.toObject(string.tocharray());
集合。洗牌(随机字符);
返回StringUtils.join(randomChars,“”);
}
这个怎么样:
public static String shuffle(String text) {
char[] characters = text.toCharArray();
for (int i = 0; i < characters.length; i++) {
int randomIndex = (int)(Math.random() * characters.length);
char temp = characters[i];
characters[i] = characters[randomIndex];
characters[randomIndex] = temp;
}
return new String(characters);
}
publicstaticstringshuffle(字符串文本){
char[]characters=text.toCharArray();
for(int i=0;i
这是一个多么烦人的问题。我最终得出以下结论:
import java.util.Collections;
import com.google.common.primitives.Chars;
import org.apache.commons.lang3.StringUtils;
String shuffle(String s) {
List<Character> chars = Chars.asList(s.toCharArray());
Collections.shuffle(chars);
return StringUtils.join(chars.stream().toArray());
}
import java.util.Collections;
导入com.google.common.primitives.Chars;
导入org.apache.commons.lang3.StringUtils;
串洗牌(串s){
List chars=chars.asList(s.tocharray());
收藏。洗牌(字符);
返回StringUtils.join(chars.stream().toArray());
}
是的,有两个库:)如果以后仍要恢复原始库,请尝试以下操作:
public static class ShuffledString
{
private List<Integer> indices;
private String string;
public ShuffledString(List<Integer> indices, String string)
{
this.indices = indices;
this.string = string;
}
public List<Integer> getIndices()
{
return indices;
}
public String getRegularString()
{
StringBuilder stringBuilder = new StringBuilder();
for (int stringIndex = 0; stringIndex < indices.size(); stringIndex++)
{
int characterIndex = indices.indexOf(stringIndex);
stringBuilder.append(string.charAt(characterIndex));
}
return stringBuilder.toString();
}
}
public static ShuffledString shuffle(String input)
{
List<Integer> indices = new ArrayList<>();
StringBuilder output = new StringBuilder(input.length());
while (indices.size() < input.length())
{
int randomIndex;
while (indices.contains(randomIndex = (int) (Math.random() * input.length())))
{
}
indices.add(randomIndex);
output.append(input.charAt(randomIndex));
}
return new ShuffledString(indices, output.toString());
}
公共静态类ShuffledString
{
私人名单索引;
私有字符串;
公共ShuffledString(列表索引、字符串)
{
该指数=指数;
this.string=string;
}
公共列表获取索引()
{
回报指数;
}
公共字符串getRegularString()
{
StringBuilder StringBuilder=新的StringBuilder();
对于(int-stringIndex=0;stringIndex
无外部库,适用于不介意使用集合的用户。shuffle():
静态字符串洗牌(字符串){
List List=string.chars().mapToObj(c->新字符((char)c))
.collect(Collectors.toList());
集合。洗牌(列表);
StringBuilder sb=新的StringBuilder();
list.forEach(c->sb.append(c));
使某人返回字符串();
}
导入java.util.Random;
公共课收费{
公共静态void main(字符串[]args){
//TODO自动生成的方法存根
String characters=“AZERTYUIOPQSDFGHJKLMWXCVBNazertyuiopqsdfghjklmwxcvbn1234567890”;
Random rand=新的Random();
//诺姆布雷克拉提尔酒店
整数长度=20;
//可变轮胎
字符串随机字符串=”;
//
字符[]文本=新字符[长度];
for(int i=0;iimport java.util.Collections;
import com.google.common.primitives.Chars;
import org.apache.commons.lang3.StringUtils;
String shuffle(String s) {
List<Character> chars = Chars.asList(s.toCharArray());
Collections.shuffle(chars);
return StringUtils.join(chars.stream().toArray());
}
public static class ShuffledString
{
private List<Integer> indices;
private String string;
public ShuffledString(List<Integer> indices, String string)
{
this.indices = indices;
this.string = string;
}
public List<Integer> getIndices()
{
return indices;
}
public String getRegularString()
{
StringBuilder stringBuilder = new StringBuilder();
for (int stringIndex = 0; stringIndex < indices.size(); stringIndex++)
{
int characterIndex = indices.indexOf(stringIndex);
stringBuilder.append(string.charAt(characterIndex));
}
return stringBuilder.toString();
}
}
public static ShuffledString shuffle(String input)
{
List<Integer> indices = new ArrayList<>();
StringBuilder output = new StringBuilder(input.length());
while (indices.size() < input.length())
{
int randomIndex;
while (indices.contains(randomIndex = (int) (Math.random() * input.length())))
{
}
indices.add(randomIndex);
output.append(input.charAt(randomIndex));
}
return new ShuffledString(indices, output.toString());
}
static String shuffle(String string){
List<Character> list = string.chars().mapToObj(c -> new Character((char) c))
.collect(Collectors.toList());
Collections.shuffle(list);
StringBuilder sb = new StringBuilder();
list.forEach(c -> sb.append(c));
return sb.toString();
}
import java.util.Random;
public class carteRecharge {
public static void main(String[] args) {
// TODO Auto-generated method stub
String characters = "AZERTYUIOPQSDFGHJKLMWXCVBNazertyuiopqsdfghjklmwxcvbn1234567890";
Random rand = new Random();
//Nombre de caratère à tirer
int length = 20;
//La variable qui contiendra le mot tire
String randomString = "";
//
char[] text = new char[length];
for(int i = 0; i < length; i++) {
text[i] = characters.charAt(rand.nextInt(characters.length()));
}
for(int i=0; i<text.length; i++) {
randomString += text[i];
}
System.out.print(randomString);
}
}
public static String shuffle(final String str) {
List<Character> chars = str.chars().mapToObj(e->(char)e).collect(Collectors.toList());
Collections.shuffle(chars);
return chars.stream().map(e->e.toString()).collect(Collectors.joining());
}
val helloCharArray = "hello".toCharArray()
helloCharArray.shuffle()
val shuffledHello = helloCharArray.concatToString()
import org.apache.commons.lang3.ArrayUtils;
String shuffle(String text) {
char[] chars = text.toCharArray();
ArrayUtils.shuffle(chars);
return String.valueOf(chars);
}
String shuffle(String str) {
return new Random().ints(0, str.length()).distinct().limit(str.length()) // shuffle indexes
.mapToObj(i->""+str.charAt(i)).collect(Collectors.joining()); // collect letters
}