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.
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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()); } } |