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java1.5注解（一）

由來(lái)

減少代碼和程序錯(cuò)誤的發(fā)生
C＃中的也有這種情況

對(duì)java程序沒有直接影響，
內(nèi)置注解
Override
Deprecated
SuppressWarnings

//對(duì)學(xué)框架有幫助
通過(guò)程序來(lái)說(shuō)明

注意override與overload區(qū)別

class OverrideTest2

{

@Override

public String toString(){

return "guoxinghua";

}

public static void main(String[] args)

{

OverrideTest2 test=new OverrideTest2();

System.out.println(test.toString());

}

class OverrideTest3

{

//@Override

public String ToString(){

return "guoxinghua";

}

public static void main(String[] args)

{

OverrideTest3 test=new OverrideTest3();

System.out.println(test.toString());

}

class OverrideTest3

{

@Override

public String ToString(){

return "guoxinghua";

}

public static void main(String[] args)

{

OverrideTest3 test=new OverrideTest3();

System.out.println(test.toString());

}

class DeprecatedTest

{

public void doSomething(){

System.out.println("guoxinghua");

}

public static void main(String[] args)

{

DeprecatedTest test=new DeprecatedTest();

test.doSomething();

}

class DeprecatedTest

{

@Deprecated

public void doSomething(){

System.out.println("guoxinghua");

}

public static void main(String[] args)

{

DeprecatedTest test=new DeprecatedTest();

test.doSomething();

}

class SubDeprecatedTest extends DeprecatedTest

{

@Override

public void doSomething(){

System.out.println("guoxinghua");

}

public static void main(String[] args)

{

SubDeprecatedTest sub=new SubDeprecatedTest();

sub.doSomething();

}

posted @ 2008-10-25 22:22 郭興華閱讀(563) | 評(píng)論 (0) | 編輯收藏

jsp中使用類

package mypack;

class Student

{

private int age;

private String xm;

private float mark;

public void setAge(int age){

this.age=age;

}

public int getAge(){

return age;

}

public void setXm(String xm)

{

this.xm=xm;

}

public String getXm()

{

return xm;

}

public void setMark(float mark)

{

this.mark=mark;

}

public float getMark(){

return mark;

}

package mypack;

class Say

{

public String hello(String xm)

{return "Hello World "+xm;

}

<%@page language="java" import ="java.util.*,mypack.*" pageEncoding="GBK"%>
<%@import="....."%>//用于多個(gè)包的導(dǎo)入

<%!

public int add(int x,int y)

{

return x+y;

}

int a=10;

%>

<%

Student stu=new Student();

stu.setAge(29);

stu.setXm("guoxinghua");

stu.setMark(200.0F);

int a=100;

%>

<%Say s=new Say()%>

<%=s.hello(stu.getXm())%>

<%=s.add(10,20)%><%=stu.getAge()%>

<%=stu.getXm()%>

<%=stu.getMark()%>

<%=this.a%>

<%=a%>

<%%>這種是代碼段，在這里聲明的方法和變量是在局部的
<%!%>這種是聲明語(yǔ)句，在這里聲明的變量和方法是全局的
<%=%>這種是表達(dá)式

posted @ 2008-10-25 11:55 郭興華閱讀(236) | 評(píng)論 (0) | 編輯收藏

VectorTest.java(待寫.....)

/**

* 通過(guò)這個(gè)程序，測(cè)試Vector的添加元素及插入元素

*/

import java.util.Vector;

public class VectorTest{

public static void main(String[] args)

{

} }

posted @ 2008-10-23 16:09 郭興華閱讀(80) | 評(píng)論 (0) | 編輯收藏

VectorTest2.java

/**

*通過(guò)這個(gè)程序，測(cè)試Vector的ratainAll方法

*/

import java.util.Vector;

public class VectorTest{

public static void main(String[] args){

VectorTest2 test=new VectorTest2();

Vector vec1=new Vector();

Vector vec2=new Vector();

Student tom =new Student("tom","20020410");

Student jack=new Student("jack","20020411");

Student smith=new Student("Smith","20020412");

Student rose=new Student("rose","20020413");

vec1.add(tom);

vec1.add(jack);

vec1.add(smith);

vec1.add(rose);

System.out.println("第一個(gè)Vector中的元素分別是：");

test.display(vec1);

vec2.add(rose);

vec2.add(tom);

System.out.println("\n第二個(gè)Vector中的元素分別是：");

test.display(vec2);

System.out.println("\n調(diào)用retainAll方法后，第一個(gè)Vector中的元素分別是：");

vec1.retainAll(vec2);

test.display(vec1);

}

public void display(Vector vec){

for(int i=0;i<vec.size();i++)

{

System.out.println(vec.get(i));

}

posted @ 2008-10-23 15:54 郭興華閱讀(101) | 評(píng)論 (0) | 編輯收藏

VectorTest2.java

/**

*通過(guò)這個(gè)程序，測(cè)試Vector的ratainAll方法

*/

import java.util.Vector;

public class VectorTest{

public static void main(String[] args){

VectorTest2 test=new VectorTest2();

Vector vec1=new Vector();

Vector vec2=new Vector();

Student tom =new Student("tom","20020410");

Student jack=new Student("jack","20020411");

Student smith=new Student("Smith","20020412");

Student rose=new Student("rose","20020413");

vec1.add(tom);

vec1.add(jack);

vec1.add(smith);

vec1.add(rose);

System.out.println("第一個(gè)Vector中的元素分別是：");

test.display(vec1);

vec2.add(rose);

vec2.add(tom);

System.out.println("\n第二個(gè)Vector中的元素分別是：");

test.display(vec2);

System.out.println("\n調(diào)用retainAll方法后，第一個(gè)Vector中的元素分別是：");

vec1.retainAll(vec2);

test.display(vec1);

}

public void display(Vector vec){

for(int i=0;i<vec.size();i++)

{

System.out.println(vec.get(i));

}

posted @ 2008-10-23 15:54 郭興華閱讀(102) | 評(píng)論 (0) | 編輯收藏

VectorTest1.java(數(shù)據(jù)結(jié)構(gòu)練習(xí))

/**

*通過(guò)這個(gè)程序，測(cè)試Vector的添加元素及插入元素

*/

import java.util.Vector;

public static void main(String[] args){

Vector vec=new Vector();

Student tom=new Student("tom","20020410");

Student jack=new Student("jack","20020412");

Student smith=new Student("Smith","20020412");

vec.add(tom);

vec.add(0,jack);//inset a new element

vec.add(0,smith);//inset a new element too

for(int i=0;i<vec.size();i++){

System.out.println(vec.get(i));

}

posted @ 2008-10-23 15:39 郭興華閱讀(95) | 評(píng)論 (0) | 編輯收藏

AbstractTest.java

/**

* 通過(guò)本程序的測(cè)試，主要學(xué)習(xí)抽象類及子類，抽象方法的實(shí)現(xiàn)

* 動(dòng)態(tài)綁定，多態(tài)

*/

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());

}}}

/**

*抽象類

*/

abstract class Person{

private String strName;

public Person(String strName)

{

this.strName = strName;

}

public String getName()

{

return strName;

}

//抽象方法，返回人的描述

public abstract String getDescription();

}

/**

* 工人類，擴(kuò)展了抽象類，并實(shí)現(xiàn)了抽象方法

*/

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);

}

/**

* 學(xué)生類，擴(kuò)展了抽象類，實(shí)現(xiàn)了抽象方法

*/

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;

}

posted @ 2008-10-23 15:23 郭興華閱讀(130) | 評(píng)論 (0) | 編輯收藏

MuilInterfaceTest.java

/**

*通過(guò)這個(gè)程序，我們要測(cè)試接口的多重實(shí)現(xiàn)，并學(xué)習(xí)對(duì)象比較方法的實(shí)現(xiàn)

*/

import java.util.Arrays

public class MuilInterfaceTest{

public static void main(String[] args){

Student[] staff=new student[3];

staff[0]=new Student("tom","20031020");

staff[1]=new Student("jack","20031022");

staff[2]=new Student("rose","20021023");

Arrays.sort(staff);

for(int i=0;i<staff.length;i++)

{

System.out.println((Student)staff[i]);

}} }

/*

*學(xué)生類，包括學(xué)生的基本信息，實(shí)現(xiàn)了Person與Comparable接口

*/

class Student implements Person, Comparable

{

private String strName = "";//學(xué)生姓名

private String strNumber = "";//學(xué)號(hào)

private String strSex = "";//性別

private String strBirthday = "";//出生年月

private String strSpeciality = "";//專業(yè)

private String strAddress = "";//地址

public Student(String name, String number)

{

strName = name;

strNumber = number;

}public int compareTo(Object otherObject){

Student other=(Student)otherObject;

int otherNumber=Integer.parseInt(other.strNumber);

int thisNumber=Integer.parseInt(this.strNumber);

if(thisNumber>otherNumber)

return 1;

else if(thisNubmer==otherNumber)

return 0;

else return -1;

}

public String getName()

{

return strName;

}

public String getStudentNumber()

{

return strNumber;

}

public void setStudentSex(String sex)

{

strSex = sex;

}

public String getSex()

{

return strSex;

}

public String getBirthday()

{

return strBirthday;

}

public void setStudentBirthday(String birthday)

{

strBirthday = birthday;

}

public String getStudentSpeciality()

{

return strSpeciality;

}

public void setStudentSpeciality(String speciality)

{

strSpeciality = speciality;

}

public String getAddress()

{

return strAddress;

}

public void setAddress(String address)

{

strAddress = address;

}

public String toString(){

String information="student name="+strName+"student numbeer="+strNumber;

if(!strSex.equals(""))

information+=",sex="+strSex;

if(!strBirthday.equals(""))

information+=",Birthday="+strBirthday;

if(!strSpeciality.equals(""))

information+=",專業(yè)＝"+strSpeciality;

if(!strAddress.equals(""))

information+=",address="+strAddress;

return information;}}

posted @ 2008-10-23 15:02 郭興華閱讀(125) | 評(píng)論 (0) | 編輯收藏

CloneTest2.java

摘要: /**//* *測(cè)試包含對(duì)象的克隆及clone方法的重寫 */ import java.util.GregorianCalendar; import java.util.Date; public class CloneTest{ public static void main(String[]&nbs... 閱讀全文

posted @ 2008-10-23 14:40 郭興華閱讀(147) | 評(píng)論 (0) | 編輯收藏

CloneTest.java

/**

*i測(cè)試對(duì)象的克隆及clone方法的重寫

*/

public class CloneTest{

public static void main(String[] args){

Student tom=new Student("tom","20020410");

Student tomcopy=(Student)tom.clone();

tomcopy.setStudentSex("man");

tomcopy.setStudentAddress("America");

System.out.println(tom);

System.out.println(tomcopy);

}

/*

* 學(xué)生類，包括學(xué)生的基本信息，實(shí)現(xiàn)了Cloneable接口

*/

class Student implements Cloneable

{

private String strName = "";//學(xué)生姓名

private String strNumber = "";//學(xué)號(hào)

private String strSex = "";//性別

private String strBirthday = "";//出生年月

private String strSpeciality = "";//專業(yè)

private String strAddress = "";//地址

public Student(String name, String number)

{

strName = name;

strNumber = number;

}

public Object clone(){

try{

return super.clone();

}

catch(CloneNotSupportedException e){

return null;}

}

public String getStudentName(){

return strNumber;

}

public void setStudentSex(String sex)

{

strSex=sex;

}

public String getStudentSex(){

return strSex;

}

public String getStudentBirthday(){

return strBirthday;

}

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 Stirng toString()

{

String information="student name="+strName+",student number="+strNumber;

if(!strSex.equals(""))

information+=",sex="+strSex;

if(!strBirthday.equals(""))

information+=",birthday="+strBirthday;

if(!strSpeciality.equals(""))

information+=",專業(yè)＝"+strSpeciality;

if(!strAddress.equals(""))

information+=",address="+strAddress;

return information;

}

posted @ 2008-10-23 14:16 郭興華閱讀(151) | 評(píng)論 (0) | 編輯收藏

java技術(shù)博客

java1.5注解（一）

jsp中使用類

VectorTest.java(待寫.....)

VectorTest2.java

VectorTest2.java

VectorTest1.java(數(shù)據(jù)結(jié)構(gòu)練習(xí))

AbstractTest.java

MuilInterfaceTest.java

CloneTest2.java

CloneTest.java

統(tǒng)計(jì)

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