token是怎么分配到不同机器上的
optional怎么处理异常

Optional<Employee> optionalEmp = new Optional(null);

try {
//get method
}catch (NullPointerException){
return optionalEmp;
}

write code for comapring two string
if they have same characters but in different order e.g.
String s1 = "army" and String s2 = "mary";
//use char[]

//initiate 2 char[] array
char[] charsInS1 = new char[26];
char[] charsInS2 = new char[26];

//loop and store in each array
for (char c1 : s1.toCharArray()) {
charsInS1[c1 - 'a']++;
}
for (char c2 : 21.toCharArray()) {
charsInS2[c2 - 'a']++;
}

//compare whether charsInS1.equals(charsInS2)
System.out.println(charsInS1.equals(charsInS2));

//if true, loop s1 and s2 for the order
for (int i = 0; i < ) {

}