JAVA集合 - ArrayList

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            /*
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             * 作者：白客C

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             * 时间：2020年02月28日

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             * 内容：简单员工管理系统

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            */
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            package
             com.beekc.www;

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            import java.io.*;
  9import java.util.*;
 10 11publicclass Beekc {
 12publicstaticvoid main(String[] args) throws Exception{
 13 14//创建EmpManage 15         EmpManage em = new EmpManage();
 16 17//输入流 18         InputStreamReader isr = new InputStreamReader(System.in);
 19         BufferedReader br = new BufferedReader(isr);
 20 21//简易菜单 22        em.menu();
 23while (true)
 24        {
 25 26             System.out.print("请选择你要进行的操作：");
 27//接收选择项 28             String operType = br.readLine();
 29 30if (operType.equals("1")) {
 31 32                 System.out.print("请输入编号：");
 33                 String empNo = br.readLine();
 34                 System.out.print("请输入名字：");
 35                 String name = br.readLine();
 36                 System.out.print("请输入工资：");
 37                 Float sal = Float.parseFloat(br.readLine());
 38 39                 Emp emp =new Emp(empNo,name,sal);
 40                em.addEmp(emp);
 41 42             }elseif (operType.equals("2"))
 43            {
 44                 System.out.print("请输入编号：");
 45                 String empNo = br.readLine();
 46                em.showInfo(empNo);
 47 48             }elseif (operType.equals("3"))
 49            {
 50                 System.out.print("请输入编号：");
 51                 String empNo = br.readLine();
 52                 System.out.print("请输入新工资：");
 53                 Float sal = Float.parseFloat(br.readLine());
 54                em.updateSal(empNo,sal);
 55 56             }elseif (operType.equals("4"))
 57            {
 58                 System.out.print("请输入编号：");
 59                 String empNo = br.readLine();
 60                em.delEmp(empNo);
 61 62             }elseif (operType.equals("5"))
 63            {
 64                em.showAll();
 65            }
 66        }
 67    }
 68}
 69 70//雇员管理类 71class EmpManage{
 72private ArrayList al = null;
 73 74//构造函数 75public EmpManage()
 76    {
 77         al = new ArrayList();
 78    }
 79 80//菜单 81publicvoid menu()
 82    {
 83         System.out.println("1.添加一个雇员");
 84         System.out.println("2.查找一个雇员");
 85         System.out.println("3.修改一个雇员工资");
 86         System.out.println("4.删除一个雇员");
 87         System.out.println("5.查询所有雇员");
 88    }
 89 90//加入员工 91publicvoid addEmp(Emp emp)
 92    {
 93//添加对象到集合 94        al.add(emp);
 95    }
 96 97//显示员工信息 98publicvoid showInfo(String empNo)
 99    {
100//遍历整个ArrayList101for(int i = 0 ; i < al.size() ; i++)
102        {
103//取出Emp对象104             Emp emp =(Emp)al.get(i);
105106//比较编号,注意字符串比较用equals()107if(emp.getEmpNo().equals(empNo))
108            {
109                 System.out.println("该员工信息是：");
110                 System.out.println("编号：" + empNo);
111                 System.out.println("名字：" + emp.getName());
112                 System.out.println("工资：" + emp.getSal());
113            }
114        }
115    }
116117//显示所有员工信息118publicvoid showAll()
119    {
120for(int i = 0 ; i < al.size() ; i++)
121        {
122             System.out.print("编号\t");
123             System.out.print("姓名\t");
124             System.out.println("工资");
125        }
126127for(int i = 0 ; i < al.size() ; i++)
128        {
129             Emp emp = (Emp)al.get(i);
130             System.out.print(emp.getEmpNo() + "\t\t");
131             System.out.print(emp.getName() + "\t\t");
132            System.out.println(emp.getSal());
133        }
134    }
135136//修改员工薪水137publicvoid updateSal(String empNo ,float newSal)
138    {
139for(int i = 0 ; i < al.size() ; i++)
140        {
141             Emp emp = (Emp)al.get(i);
142if(emp.getEmpNo().equals(empNo))
143            {
144//修改成功145                emp.setSal(newSal);
146            }
147        }
148    }
149150//删除员工151publicvoid delEmp(String empNo)
152    {
153for(int i = 0 ; i < al.size() ; i++)
154        {
155             Emp emp = (Emp)al.get(i);
156if(emp.getEmpNo().equals(empNo))
157            {
158//删除集合里的对象159                al.remove(i);
160//al.remove(emp);161            }
162        }
163    }
164//--------------------------165}
166167//雇员类168class Emp{
169//学号170private String empNo;
171//姓名172private String name;
173//薪水174privatefloat sal;
175176//构造函数177public Emp(String empNo, String name, float sal)
178    {
179this.empNo = empNo;
180this.name = name;
181this.sal = sal;
182    }
183184public String getEmpNo() {
185return empNo;
186    }
187188publicvoid setEmpNo(String empNo) {
189this.empNo = empNo;
190    }
191192public String getName() {
193return name;
194    }
195196publicvoid setName(String name) {
197this.name = name;
198    }
199200publicfloat getSal() {
201return sal;
202    }
203204publicvoid setSal(float sal) {
205this.sal = sal;
206    }
207 }