在java中如何在两个字符之间切换？

char[] chars = {'a', 'b'};
char temp = chars[0];
chars[0] = chars[1];
chars[1] = temp;

char char1 = 'a';
char char2 = 'b';
char temp = char1;
char1 = char2;
char2 = temp;

char char1 = 'a';
char char2 = 'b';
char1 = (char) (char1 ^ char2);
char2 = (char) (char1 ^ char2);
char1 = (char) (char1 ^ char2);