3-8作业问题

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    package com.imcoo.demo;
/***
 * 创建 部门类
 * @author Administrator
 *   描述部门编号、部门名称、获取所有该部门员工信息
 *   统计该部门员工个数
 */
public class Department {
 
     private String departmentnumb;
     private String departmentname;
     private staff[] mystaff;
     private int staffNumber;
 
      
    public Department() {
         
    }
    public Department(String departmentname) {
             
        this.setDepartmentname(departmentname);
    }
     
     
    public String getDepartmentnumb() {
        return departmentnumb;
    }
    public void setDepartmentnumb(String departmentnumb) {
        this.departmentnumb = departmentnumb;
    }
    public String getDepartmentname() {
        return departmentname;
    }
    public void setDepartmentname(String departmentname) {
        this.departmentname = departmentname;
    }
    public staff[] getMystaff() {
        if(this.mystaff==null)
            this.mystaff=new staff[100];
        return mystaff;
    }
    public void setMystaff(staff[] mystaff) {
        this.mystaff = mystaff;
    }
      
     public int getStaffNumber() {
        return staffNumber;
    }
    public void setStaffNumber(int staffNumber) { 
        this.staffNumber = staffNumber;
    }
     
    public void  addstaff(staff sta) {
         
         for(int i=0,m=0,n=0;i<this.getMystaff().length;i++) {
             if(this.getMystaff()[i]==null) {
             this.getMystaff()[i]=sta;          
                 if(this.getMystaff()[i].getStaffname()=="人事部")
                 { this.staffNumber=m+1;
                     m++;
                 }
                     else 
                        {this.staffNumber=n+1;
                         n++;}
                 break;
             }
                 
             
              
              
              
     }
 
          
          
     }  
     
     
}       
             
             
             
             
             
             
             
    package com.imcoo.test;
import com.imcoo.demo.Department;
import com.imcoo.demo.Job;
import com.imcoo.demo.staff;
public class TestDemo {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Department  dep1=new Department("人事部");
        Job job1=new Job("经理");
        staff sta1= new staff("张铭","S001","男",29,dep1,job1);
         
        System.out.println(sta1.Play());
        System.out.println("====================================");
         
     
        Job job2=new Job("助理");
        staff sta2= new staff("李艾爱","S002","女",21,dep1,job1);
        System.out.println(sta2.Play());
        System.out.println("====================================");
         
        Job job3=new Job("职员");
        staff sta3= new staff("孙超","S004","男",29,dep1,job3);
        System.out.println(sta3.Play());
        System.out.println("====================================");
        Department  dep2=new Department("市场部");      
        staff sta4= new staff("张美美","S005","女",26,dep2,job3);
        System.out.println(sta4.Play());
        System.out.println("====================================");
        staff sta5= new staff("张蓝迪","S006","男",37,dep2,job1);
        System.out.println(sta5.Play());    
        staff sta6= new staff("米莉","S007","女",24,dep2,job3);
        System.out.println(sta6.Play());
        System.out.println("====================================");
         
        dep1.addstaff(sta1);
        dep1.addstaff(sta2);
        dep1.addstaff(sta3);
        dep2.addstaff(sta4);
        dep2.addstaff(sta5);
        dep2.addstaff(sta6);
         
         
        System.out.println(dep1.getDepartmentname()+"总共有"+dep1.getStaffNumber()+"名员工");
        System.out.println(dep2.getDepartmentname()+"总共有"+dep2.getStaffNumber()+"名员工");
    }
 
     
     
}       
            

老师帮忙看下我这个输出为什么一直是1 到底是我的加法语句有问题还是其他地方的问题

猪哥哥呀 2017-09-26

源自：Java封装综合案例 3-7 问题解析--通过一个方法完成学生和专业的双向关联

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1回答

好帮手慕雪 2017-09-27 09:48:56

1）因为每次 addstaff(staff sta) 时都会走 for(int i=0,m=0,n=0;i<this.getMystaff().length;i++) {所以m和n每次都是从0开始计数的，你可以把m,n删除,直接写成this.staffNumber=this.staffNumber+1; 2）另外你没必要 if(this.getMystaff()[i].getStaffname()=="人事部")｛｝else{}不管是什么部门，this.staffNumber都是在统计本部门的员工数。直接this.staffNumber=this.staffNumber+1; 就可以了。3）字符串判断内容是否相等不是用==判断，而应该用"".equals("")这种形式。祝：学习愉快

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提问者猪哥哥呀 #1

public void addstaff(staff sta) { /** * 1丶将员工保存到数组中； * 2丶将人事部员工个数保存到staffNumber1 * 3丶将市场部员工个数保存到staffNumber2 */ for(int i=0;i<this.getMystaff().length;i++) { if(this.getMystaff()[i]==null) { this.getMystaff()[i]=sta; this.staffNumber1++; this.staffNumber2++; break; } 可是我这是分别统计2个部门员工的个数，我这样写解释不通啊，为什么我用if(this.getMystaff()[i].getStaffname().equals("人事部")} 这句话判断输入哪个部门不起作用？

2017-09-27 15:30:51
好帮手慕雪回复提问者猪哥哥呀 #2

查看 http://class.imooc.com/course/qadetail/21518

2017-09-27 17:34:22