Java中返回算术运算符

Question

I am working on a program that returns arithmetic expressions which include operators and integer numbers. The code that i have implemented for it is this :

public String randomOperators() {
    Random random = new Random();
    String[] operators = {"+","-","*","/"};
    return operators[random.nextInt(4)];
}

the problem in this code is that it returns the operators but all the operators in the expression are same: example: i get an expression 9+2+3+4+5+ = ? i don't want it to have + in all, it can be many random operators in one expression. Any help would be appreciated. Thanks

Answer 1

new Random() initializes the random seed with an approximation of the current time, so if called many times in quick succession, the system clock will read the same -- and the random numbers generated will be the same.

Instead, have one Random stored as a static field, or pass in a Random to randomOperators and reuse that same instance.