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java中过多if-else分支语句的优化方案

利用Map优化过的的if-else分支

package com.taiping.test;

import java.util.HashMap;
import java.util.Map;

public class Test {

  public static void main(String[] args) throws Exception {

    int seatCount=2; //需要进行判断的变量

    String projectCode;//判断之后赋值的变量

    String type = "A";

    /**优化之前,逻辑判断太多,效率低下*/
    if(type.equals("A")){
      if(seatCount == 2){
        projectCode = "0001";
      }else if(seatCount == 4){
        projectCode = "0002";
      }else if(seatCount == 5){
        projectCode = "0003";
      }else if(seatCount == 6){
        projectCode = "0004";
      }else if(seatCount == 7){
        projectCode = "0005";
      }
    }else{
      if(seatCount == 2){
        projectCode = "0006";
      }else if(seatCount == 4){
        projectCode = "0007";
      }else if(seatCount == 5){
        projectCode = "0008";
      }else if(seatCount == 6){
        projectCode = "0008";
      }else if(seatCount == 7){
        projectCode = "0010";
      }
    }


    /**优化之后,采用map方式,简洁高效*/
    Map<Integer, String> map = new HashMap<Integer, String>();

    if(type.equals("A")){
      map.put(2, "0001");
      map.put(4, "0002");
      map.put(5, "0003");
      map.put(6, "0004");
      map.put(7, "0005");
    }else{
      map.put(2, "0006");
      map.put(4, "0007");
      map.put(5, "0008");
      map.put(6, "0009");
      map.put(7, "0010");
    }

    projectCode = map.get(seatCount);//采用map的get方式取值

    System.out.println(projectCode);

  //优化前与优化后结果一致,map方式效率更好
  }  

}

posted @ 2019-02-27 17:01  Happy丶小鱼  阅读(13626)  评论(4编辑  收藏  举报