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Permutation.java
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43 lines (35 loc) · 986 Bytes
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package algorithms;
/**
* @Auther: Jesper
* @Date: 2019/2/12 17:23
* @Description: 全排列
*/
public class Permutation {
int count = 0;
public void permutation(char[] cs, int index) {
if (index > cs.length) {
return;
}
if (index == cs.length) {
System.out.println(new String(cs));
count++;
}
for (int i = index; i < cs.length; i++) {
swap(cs, index, i);
permutation(cs, index + 1);
// 再次交换，保持原状
swap(cs, index, i);
}
}
private void swap(char[] cs, int index, int target) {
char tmp = cs[index];
cs[index] = cs[target];
cs[target] = tmp;
}
public static void main(String[] args) {
char[] cs = new char[]{'a', 'b', 'c', 'd'};
Permutation per = new Permutation();
per.permutation(cs, 0);
System.out.println("方法总数:" + per.count);
}
}