Maximum 69 Number
给一个数字, 6和9可以互换一次, 求得到的最大数字.
class Solution {
public int maximum69Number (int num) {
String s = num + "";
StringBuilder sb = new StringBuilder(s);
for(int i = 0; i < sb.length(); i++) {
if(sb.charAt(i) == '6') {
sb.setCharAt(i, '9');
break;
}
}
return Integer.valueOf(sb.toString());
}
}