java 代码优化

Question

问题描述

代码里面出现了太多的if条件怎么优化

相关代码

if (workPerson.contains("A")){
a ++;
}
if (workPerson.contains("B")){
b ++;
}
if (workPerson.contains("C")){
c ++;
}
if (workPerson.contains("D")){
d ++;
}
if (workPerson.contains("E")){
e ++;
}
if (workPerson.contains("F")){
f ++;
}

不想有这么多if判断该怎么优化呢？

Answer 1

Map<String,Integer> workPerson = new HashMap<>();
workPerson.put("A",0);
workPerson.put("B",0);
workPerson.put("C",0);
workPerson.put("D",0);
workPerson.put("E",0);
workPerson.put("F",0);

String inputStr = "F";
workPerson.put(inputStr, workPerson.getOrDefault(inputStr, 0) + 1);
System.out.println(workPerson);

Answer 2

if 是难免的，无需优化

Answer 3

if (workPerson.contains("A")) a ++;
if (workPerson.contains("B")) b ++;
if (workPerson.contains("C")) c ++;
if (workPerson.contains("D")) d ++;
if (workPerson.contains("E")) e ++;
if (workPerson.contains("F")) f ++;

或者将数据存map里

Map<String, Integer> map = new HashMap<>();
map.put("A", map.getOrDefault("A", 0) + 1);

取值

Integer a = map.get("A");