-1
我已经在下面写了这样的代码,并且我会将两个列表传递给此方法,其中tree list
是空列表,而array list
是对象列表。为什么不返回正确的排列!
public void permute(List<Element> tree, List<Element> array) {
if (array.size() <= 1) {
for (Element i : array) {
tree.add(i);
}
System.out.println(tree.toString());
} else {
for (int i = 0; i < array.size(); i++) {
try {
list = array.subList(0, i);
list.add(array.get(i + 1));
tree.add(array.get(i));
permute(tree, list);
} catch (StringIndexOutOfBoundsException exception) {
exception.printStackTrace();
}
}
}
}
,但它会打印下面几行:
[digit :7 probability: 66.0, digit :7 probability: 66.0]
[digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0]
[digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0]
[digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0]
[digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0]
[digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0]
[digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0, digit :7 probability: 66.0]
也行继续,但我在这里只是复制了一些他们的! 它有什么问题? 请帮我 感谢 编辑: 这是字符串的代码,我用它为我的对象:
import java.io.*;
public class NewClass{
public static void main(String args[]) throws IOException{
String str;
System.out.println("Enter the initial string");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
str=br.readLine();
System.out.println("Permutations are :");
permute("", str);
}
public static void permute(String beginningString, String endingString) {
if (endingString.length() <= 1)
System.out.println(beginningString + endingString);
else
for (int i = 0; i < endingString.length(); i++) {
try {
String newString = endingString.substring(0, i) + endingString.substring(i + 1);
permute(beginningString + endingString.charAt(i), newString);
} catch (StringIndexOutOfBoundsException exception) {
exception.printStackTrace();
}
}
}
}
你到底想达到什么目的?如果你通过数组[1,2,3,4,5],你期望什么结果? – 2010-12-10 11:17:02
你最初**作为参数传递了什么,即'beginningString'的初始值和'endingString'的初始值是什么? – 2010-12-10 11:17:49
我想要所有的组合!例如5个数字,我想要5个!每个排列都将显示为一个数组列表。 – user472221 2010-12-10 11:21:39