对统计部门人数还是不太理解

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为什么de1.fff和de2.fff 统计的人数一样 不是de1先放了3个，de2再放3个进数组吗？ 我之前是写了2个fff方法来得到结果的

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// 计算人数的方法

public void fff(Employess emp){

for(int i=0;i<this.getMyemoloyess1().length;i++){

if(this.myemoloyess1[i]==null){

emp.setDepartment(this);;

this.myemoloyess1[i]=emp;

this.Num1=i+1;

return;

}

}

}

//创建对象数组来统计

private Employess[] myemoloyess1=new Employess[100];

//实例化两个部门

Department de1 = new Department("J001", "人事部");

Department de2 = new Department("J002", "市场部");

//

Employess em1 = new Employess("张铭", "S001", "男", 29);

em2,3,4,5,6;

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de1.fff(em1);

de1.fff(em2);

de1.fff(em3);

System.out.println(de1.getDepartmentName() + "有" + de1.getNum1() + "名员工");

de2.fff(em4);

de2.fff(em5);

de2.fff(em6);

System.out.println(de2.getDepartmentName() + "有" + de2.getNum1() + "名员工");