leetcode SingleNumber
z
 2019-04-09 10:36:27   
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public class SingleNumber {
  public static void main(String[] args){

    int i = 9; // 1001
    int x = 1; //    1
    System.out.println(i^x);
    System.out.println(i|x);
    System.out.println(i&x);
  }
}