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java培训
Java Collection接口

    import java.util.*;

    public class BasicContainer {

    public static void main(String[] args) {

    Collection c = new HashSet();

    c.add("hello");

    c.add(new Name("f1","l1"));

    c.add(new Integer(100));

    c.remove("hello");

    c.remove(new Integer(100));

    System.out.println

    (c.remove(new Name("f1","l1")));

    System.out.println(c);

    }

    }

    class Name implements Comparable {

    private String firstName,lastName;

    public Name(String firstName, String lastName) {

    this.firstName = firstName; this.lastName = lastName;

    }

    public String getFirstName() { return firstName; }

    public String getLastName() { return lastName; }

    public String toString() { return firstName + " " + lastName; }

    public boolean equals(Object obj) {

    if (obj instanceof Name) {

    Name name = (Name) obj;

    return (firstName.equals(name.firstName))

    && (lastName.equals(name.lastName));

    }

    return super.equals(obj);

    }

    public int hashCode() {

    return firstName.hashCode();

    }

    public int compareTo(Object o) {

    Name n = (Name)o;

    int lastCmp =

    lastName.compareTo(n.lastName);

    return

    (lastCmp!=0 ? lastCmp :

    firstName.compareTo(n.firstName));

    }

    }