Java从入门到精通09-集合

import java.util.ArrayList;

public class Test {
    public static void main(String args[]) {
        ClerkManage cm = new ClerkManage();
        Clerk clerk1 = new Clerk("01", "宋江", 40, 20000);
        Clerk clerk2 = new Clerk("02", "吴用", 38, 18000);
        Clerk clerk3 = new Clerk("03", "林冲", 42, 15000);
        cm.addClerk(clerk1);
        cm.addClerk(clerk2);
        cm.addClerk(clerk3);
        cm.showInfo("02");
        cm.updateSalary("01",25000);
        cm.removeClerk("03");
    }
}

class ClerkManage {
    private ArrayList al = null;

    public ClerkManage() {
        al = new ArrayList();
    }

    public void addClerk(Clerk clerk) {
        al.add(clerk);
    }

    public void showInfo(String no) {
        for (int i = 0; i < al.size(); i++) {
            Clerk clerk = (Clerk) al.get(i);
            if (clerk.getNo().equals(no)) {
                System.out.println("找到该员工信息！");
                System.out.println("姓名：" + clerk.getName());
                System.out.println("年龄：" + clerk.getAge());
                System.out.println("薪水：" + clerk.getSalary());
            }
        }
    }

    public void updateSalary(String no, float salary) {
        for (int i = 0; i < al.size(); i++) {
            Clerk clerk = (Clerk) al.get(i);
            if (clerk.getNo().equals(no)) {
                clerk.setSalary(salary);
            }
        }
    }

    public void removeClerk(String no) {
        for (int i = 0; i < al.size(); i++) {
            Clerk clerk = (Clerk) al.get(i);
            if (clerk.getNo().equals(no)) {
                al.remove(i);
            }
        }
    }
}

class Clerk {
    private String no;
    private String name;
    private int age;
    private float salary;

    public Clerk(String no, String name, int age, float salary) {
        this.no = no;
        this.name = name;
        this.age = age;
        this.salary = salary;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public float getSalary() {
        return salary;
    }

    public void setSalary(float salary) {
        this.salary = salary;
    }

    public String getNo() {
        return no;
    }

    public void setNo(String no) {
        this.no = no;
    }
}

public class Test {
    public static void main(String args[]) {
        HashMap hm = new HashMap();
        Clerk clerk1 = new Clerk("01", "宋江", 40, 20000);
        Clerk clerk2 = new Clerk("02", "吴用", 38, 18000);
        Clerk clerk3 = new Clerk("03", "林冲", 42, 15000);
        hm.put("01", clerk1);
        hm.put("02", clerk2);
        hm.put("03", clerk3);
        if (hm.containsKey("01")) {
            System.out.println("有该员工!");
            Clerk clerk = (Clerk) hm.get("01");
            System.out.println("姓名：" + clerk.getName());
            System.out.println("年龄：" + clerk.getAge());
            System.out.println("薪水：" + clerk.getSalary());
        } else {
            System.out.println("查无此人!");
        }
        //遍历HashMap中所有的key和value
        Iterator it = hm.keySet().iterator();
        while (it.hasNext()) {
            //取出key
            String key = it.next().toString();
            Clerk clerk = (Clerk) hm.get(key);
            System.out.println("姓名：" + clerk.getName());
            System.out.println("年龄：" + clerk.getAge());
            System.out.println("薪水：" + clerk.getSalary());
        }
    }
}