java实现:从26个字目中任取5个字母,排列组合出所有的可能,打印出来
推荐回答(1个)
package baidu.testTwo;
public class Sort {
private static char[] NUM = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
'W', 'X', 'Y', 'Z' };// 所有的字母数
public char[] randNum(int num) {// 随机选取num个数
char[] s = new char[num];// 定就num个长度的字符数组
int i = 0;// 计算循环数
int n = 0;// 控制循环
while (i < num) {
char c = NUM[(int) (Math.random() * NUM.length)];// 随机出一个字符,将其赋给c
for (int j = 0; j < s.length; j++) {// 这个循环是除去重的字符
if (s[j] == c)
{// 如果有重复的则终止循环
n = 1;// 将n=1
break;// 终止for循环
}
}
if (n == 1) { // 如果n==1,则进入下一个while循环
n = 0; // 将n还原 n=0;
continue; // 进入下一循环
} else { // 如果n不等于1,刚将字符c赋给s[i]
n = 0; // 将n还原 n=0;
s[i] = c; // 将字符c赋给s[i]
i++;
}
}
return s;// 返回含有num个不重复的字符数组
}
public void sortNum(int num) {//排列出所有的可能
char[] s = randNum(num).clone();//clone一个randNum(num);
System.out.println("***" + s.length);//打印s的长度
for (int i = 0; i < s.length; i++) {//排列循环
for (int j = 0; j < s.length - 1; j++) {
char t;
t = s[j];
s[j] = s[j + 1];
s[j + 1] = t;
for (int m = 0; m < s.length; m++) {//打印排列
System.out.print(s[m]);
}
System.out.println();
}
}
}
public static void main(String[] a) {
Sort s = new Sort();
s.sortNum(5);
}
}
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