switch-case statement in Java

class ArithmeticFunction {
  public static int arithmetic(int a, int b, String operator) {
    int result=0;
    switch(operator){
    case "add":
      result=a+b;
    case "subtract":
      result=a-b;
    case "multiply":
      result=a*b;
    case "divide":
      result=a/b;

    return result;//The statement is valid here
    }
    return result;//The statement is invalid here, and the value of result is 0
  }
}

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