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Mon, 12 Jan 2009 14:17:00 GMT

上�v交通大学java视频教程�?1�?/a>
If you are interested in java, you can spend time learning about it

郭兴�?/a> 2009-01-12 22:17 发表评论

*.class 如何打包

Thu, 13 Nov 2008 01:12:00 GMT

先放下吧

郭兴�?/a> 2008-11-13 09:12 发表评论

java中的printf

Thu, 13 Nov 2008 01:09:00 GMT

public class TestPrintf{
    public static void main(String args[]){
        System.out.printf("%+8.3f",3.14);
        System.out.println();
        System.out.printf("%+-8.3f\n",3.14);
        System.out.printf("%08.3f\n",3.14);
        System.out.printf("%(8.3f\n",-3.14);
        System.out.printf("%,f\n",2356.34);
        System.out.printf("%x\n",0x4a3b);
        System.out.printf("%#x\n",0x4a3b);
        System.out.println("------------");
        System.out.printf("你好:%s,%3d�?工资%-7.2f\n","张三",38,15000.00);
        System.out.printf("你好:%1$s,%2$3d�?%2$#x岁\n","张三",38);
        System.out.printf("%3d,%#",38);
    }
}

郭兴�?/a> 2008-11-13 09:09 发表评论

java中的集合

Thu, 13 Nov 2008 01:07:00 GMT

摘要: Integer[] a = {3,25,12,79,48}; System.out.println(a); System.out.println(Arrays.toStrin... 阅读全文

郭兴�?/a> 2008-11-13 09:07 发表评论

Arraylist

Fri, 07 Nov 2008 08:34:00 GMT

/**
*　��试数组列表的��?br /> */

import java.util.ArrayList;

public class ArrayListTest
{
    public static void main(String[] args)
    {
        ArrayList list = new ArrayList();
        list.add(new Student("Tom","20020410"));
        list.add(new Student("Jack","20020411"));
        list.add(new Student("Rose","20020412"));

        for(int i = 0; i < list.size(); i++)
        {
            System.out.println((Student)list.get(i));
        }
    }
}

class Student
{
    private String strName = "";//学生姓名
    private String strNumber = "";//学号
    private String strSex = "";//性别
    private String strBirthday = "";//出生�q�月
    private String strSpeciality = "";//专业
    private String strAddress = "";//地址

    public Student(String name, String number)
    {
        strName = name;
        strNumber = number;
    }

    public String getStudentName()
    {
        return strName;
    }

    public String getStudentNumber()
    {
        return strNumber;
    }

    public void setStudentSex(String sex)
    {
        strSex = sex;
    }

    public String getStudentSex()
    {
        return strSex;
    }

    public String getStudentBirthday()
        {
        return strBirthday;
    }

    public void setStudentBirthday(String birthday)
    {
        strBirthday = birthday;
    }

    public String getStudentSpeciality()
    {
        return strSpeciality;
    }

    public void setStudentSpeciality(String speciality)
    {
        strSpeciality = speciality;
    }

    public String getStudentAddress()
    {
        return strAddress;
    }

    public void setStudentAddress(String address)
    {
        strAddress = address;
    }

    public String toString()
    {
        String information = "学生姓名=" + strName + ", 学号=" + strNumber;
        if( !strSex.equals("") )
            information += ", 性别=" + strSex;
        if( !strBirthday.equals(""))
            information += ", 出生�q�月=" + strBirthday;
        if( !strSpeciality.equals("") )
            information += ", 专业=" + strSpeciality;
        if( !strAddress.equals("") )
            information += ", �c�诏=" + strAddress;
        return information;
    }
}

郭兴�?/a> 2008-11-07 16:34 发表评论

Fri, 07 Nov 2008 08:31:00 GMT

/**
* 通过本程序的��试�Q�主要学习抽象类及子�c�，抽象�Ҏ(gu��)��的实�?br /> * 动态绑定，多�?br /> */

import java.text.NumberFormat;

public class AbstractTest
{
    public static void main(String[] args)
    {
        Person[] p = new Person[2];
        p[0] = new Worker("Jack", 1000);
        p[1] = new Student("Tom", "Computer");

        for(int i = 0; i < p.length; i++)
        {
            Person people = p[i];
            System.out.println(people.getDescription());
        }
    }
}

/**
* 抽象�c?br /> */
abstract class Person
{
    private String strName;

    public Person(String strName)
    {
        this.strName = strName;
    }

    public String getName()
    {
        return strName;
    }

    //抽象�Ҏ(gu��)��Q�返回�h的描�q?/span>
    public abstract String getDescription();
}

/**
* 工�h�c�，扩展了抽象类�Q��ƈ实现了抽象方�?br /> */
class Worker extends Person
{
    private double salary;

    public Worker(String strName, double s)
    {
        super(strName);
        salary = s;
    }

    public String getDescription()
    {
        NumberFormat formate = NumberFormat.getCurrencyInstance();
        return "the worker with a salary of " + formate.format(salary);
    }
}

/**
* 学生�c�，扩展了抽象类�Q�实��C��抽象�Ҏ(gu��)��
*/
class Student extends Person
{
    private String strMajor;

    public Student(String strName, String strMajor)
    {
        super(strName);
        this.strMajor = strMajor;
    }

    public String getDescription()
    {
        return "the student majoring in " + strMajor;
    }
}

郭兴�?/a> 2008-11-07 16:31 发表评论

java中的HashMapTest

Fri, 07 Nov 2008 08:12:00 GMT

摘要: /** *//** *　通过�q�个�E�序�Q�测试散列映像的存储与遍历，�Ҏ(gu��)��的��? */ import java.util.HashMap; import java.util.Collection; import java.util.Iterator; import java.util.Set; public&nb... 阅读全文

郭兴�?/a> 2008-11-07 16:12 发表评论

java中的treeset

Fri, 07 Nov 2008 08:10:00 GMT

/**
* 通过�q�个�E�序�Q�测试树集的��d��元素的无序性与输出的有序�?br /> */

import java.util.TreeSet;
import java.util.Iterator;

public class TreeSetTest
{
    public static void main(String[] args)
    {
        TreeSet tree = new TreeSet();
        tree.add("China");
        tree.add("America");
        tree.add("Japan");
        tree.add("Chinese");

        Iterator iter = tree.iterator();
        while(iter.hasNext())
        {
            System.out.println(iter.next());
        }
    }
}

郭兴�?/a> 2008-11-07 16:10 发表评论

java中的treemap

Fri, 07 Nov 2008 08:08:00 GMT

摘要: /** *//** *　通过�q�个�E�序�Q�测试树映像的��用，表目集合的遍�? */ import java.util.TreeMap; import java.util.Map; import java.util.Iterator; import java.util.Set; public class&... 阅读全文

郭兴�?/a> 2008-11-07 16:08 发表评论