JAVA学习笔记-08

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set接口是Collection子接口，没有顺序，是集合。具体实现HashSet,TreeSet。底层用HashMap实现，放在key中，所以不能有重复的元素。
JAVA-bean

public class Employee {//javabean,实体类    private int id;    private String name;    private int salary;    private String departement;    private Date hireDate;    DateFormat format = new SimpleDateFormat("yyyy-MM-dd");    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getSalary() {        return salary;    }    public void setSalary(int salary) {        this.salary = salary;    }    public String getDepartement() {        return departement;    }    public void setDepartement(String departement) {        this.departement = departement;    }    public Date getHireDate() {        return hireDate;    }    public void setHireDate(Date hireDate) {        this.hireDate = hireDate;    }    public Employee(int id, String name, int salary, String departement, String hireDate) throws ParseException {        super();        this.id = id;        this.name = name;        this.salary = salary;        this.departement = departement;        this.hireDate = format.parse(hireDate);    }   }

public class Employee {//javabean,实体类    private int id;    private String name;    private int salary;    private String departement;    private Date hireDate;    DateFormat format = new SimpleDateFormat("yyyy-MM-dd");    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getSalary() {        return salary;    }    public void setSalary(int salary) {        this.salary = salary;    }    public String getDepartement() {        return departement;    }    public void setDepartement(String departement) {        this.departement = departement;    }    public Date getHireDate() {        return hireDate;    }    public void setHireDate(Date hireDate) {        this.hireDate = hireDate;    }    public Employee(int id, String name, int salary, String departement, String hireDate) throws ParseException {        super();        this.id = id;        this.name = name;        this.salary = salary;        this.departement = departement;        this.hireDate = format.parse(hireDate);    }   }

Set的遍历方法

public class test01 {public static void main(String[] args) {//无序的Set遍历方法    Set set = new HashSet();    set.add("aaa");    set.add("bbb");    set.add("ccc");    Iterator iter =set.iterator();    while(iter.hasNext()) {        System.out.println((String)iter.next());        }    }}

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