Java实验一
-
面向对象编程图书类
点击查看代码
import java.util.Date;//java.sql.Date;
import java.text.SimpleDateFormat;
interface management {
void borrow();
void rebook();
}
class Book {
String name;
Date date;
String log;
int count;
Book(String n,Date d,String l,int c){
this.name = n;
this.date = d;
this.log = l;
this.count = c;
}
public Book(){
this.name = "jobs";
this.date= new Date(111,4,20);
this.log = "literature";
this.count = 20;
}//默认
void reDate(Date date2){
date = date2;
}
void getDate(){
System.out.print("public date="+date+";");
}
void getName(){
System.out.print("name="+name+";");
}
void getNumber(){
System.out.print("Quantity="+count+";");
}
void getSort(){
System.out.print("class="+log+";");
}
void display(){
System.out.println("name="+name+";public date="+date+";class="+log+";Quantity="+count+";");
}
}
public class Science extends Book implements management{
String profession;
public Science(String n,Date d,String l,int c,String p){
super(n,d,l,c);
this.profession = p;
}
public void borrow(){
this.count--;
}
public void rebook(){
this.count++;
}
void display(){
System.out.println("name:"+name+",public date:"+date+",class:"+log+",Quantity:"+count+",Professional type:"+profession);
}
public static void main(String[] args) {
Date date1 = new Date(2017-01-05);
Book book1 = new Book("Novel", date1, "Novel class", 200);
Date date2 = new Date(2015-01-05);
book1.reDate(date2);
book1.display();
Book book2=new Book();
book2.display();
Date date3 = new Date(13, 1, 1);
Book book3 = new Book("Prose", date3, "Prose class", 22);
book3.getDate();
book3.getName();
book3.getNumber();
book3.getSort();
Date date4 = new Date(20, 4, 4);
book3.reDate(date4);
book3.display();
Science science = new Science("Technology", date4, "Technology class", 20,"Technology");
science.borrow();
science.display();
science.rebook();
science.display();
}
}
-
面向对象编程动物类
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class Animal {
static int age;
static String name;
static String sex;
public Animal(String string, String string2, int i) {
// TODO Auto-generated constructor stub
name=new String();
name=string;
sex=new String();
sex=string2;
age=i;
}
public Animal()
{
}
public void getName() {
// TODO Auto-generated method stub
System.out.println("name:"+name);
}
public void getAge() {
// TODO Auto-generated method stub
System.out.println("age:"+age);
}
public void getSex() {
// TODO Auto-generated method stub
System.out.println("sex:"+sex);
}
public void growUp() {
// TODO Auto-generated method stub
age+=1;
}
public static void getInfo() {
// TODO Auto-generated method stub
System.out.println("name:"+name);
System.out.println("sex:"+sex);
System.out.println("age:"+age);
}
}
interface Action {
void breed();
void move();
}
public class Frog extends Animal implements Action{
static String type;
public Frog(String string, String string2, String string3, int i) {
// TODO Auto-generated constructor stub
super(string,string2,i);
type=new String();
type=string3;
}
public Frog(String string, String string2, int i) {
// TODO Auto-generated constructor stub
super();
name=new String();
name="frog";
sex=new String();
sex=string;
type=new String();
type=string2;
age=i;
}
public void growup()
{
super.growUp();
}
public static void getInfo() {
// TODO Auto-generated method stub
System.out.println("name:"+name);
System.out.println("sex:"+sex);
System.out.println("age:"+age);
if (age>=10)
{
System.out.println("Form:"+"frog");
}
else
{
System.out.println("Form:"+"tadpole");
}
}
public void breed() {
// TODO Auto-generated method stub
System.out.println("Production of larvae");
}
public void move() {
// TODO Auto-generated method stub
if(age>=10)
{
System.out.println("jump");
}
else
{
System.out.println("swim");
}
}
public static void main(String[] args) {
Animal cat = new Animal("cat","female",3);//名字，性别，年龄
cat.getName();
cat.getAge();
cat.getSex();
cat.growUp();
Animal.getInfo();
Frog frog1 = new Frog("frog","male","tadpole",5);//名字，性别，形态，年龄
frog1.growUp();
frog1.getInfo();
frog1.move();
frog1.breed();
Frog frog2 = new Frog("male","tadpole",9);//性别，形态，年龄
frog2.growUp();
frog2.getInfo();
frog2.move();
frog2.breed();
}
}
-
面向对象编程点和圆
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class Rectangle {
double width;
double height;
Rectangle(double d1,double d2){
width = d1;
height = d2;
}
double getArea(){
return (width*height);
}
double getS(){
return 2*(width+height);
}
}
class Square extends Rectangle{
Square(double d1,double d2){
super(d1,d2);
}
}
class Point {
double x;
double y;
double getX()
{
return x;
}
double getY()
{
return y;
}
void show()
{
System.out.println("("+x+","+y+")");
}
Point(int i1,int i2)
{
x = i1;
y = i2;
}
}
class Circle extends Point{
double r;
double getArea(){
return Math.PI*r*r;
}
double getS()
{
return 2*Math.PI*r;
}
double getR()
{
return r;
}
void setR(int x){
r = x;
}
Circle(int i1,int i2){
super(i1,i2);
}
}
public class Test{
public static void main(String args[]){
Point p = new Point(1,2);
p.show();
Circle s = new Circle(1,1);
s.setR(2);
System.out.println("The circumference of the circle is:"+s.getS());
System.out.println("The area of the circle is:"+s.getArea());
System.out.println("The radius of the circle is:"+s.getR());
s.show();
Rectangle r = new Rectangle(1,2);
System.out.println("The circumference of the rectangle is:"+r.getS());
System.out.println("The area of the rectangle is:"+r.getArea());
Square t = new Square(1,1);
System.out.println("The circumference of the square is:"+t.getS());
System.out.println("The area of the square is:"+t.getArea());}
}
-
虚函数与多态性设计OK
点击查看代码
import java.util.Scanner;
//A类声明与定义
class A{
private int a;
A(int aa){
a=aa;
System.out.println("A construct");
}
A(){
System.out.println("A construct");
}
void fun1(){
System.out.println(a+" A::fun1");
}
void fun2(){
System.out.println(a+" A::fun2");
}
public void finalize(){
System.out.println("A destruct");
}
public static void f(A obja){
obja.fun1();
obja.fun2();
}
}
//B类声明与定义
public class B extends A{
private int b;
public void finalize(){
System.out.println("B destruct");
System.out.println("A destruct");
}
void fun1(){
System.out.println(b+" B::fun1");
}
public B(int aa,int bb){
super(aa);
b=bb;
System.out.println("B construct");
}
public static void main(String[] args) {
int a,b;
Scanner sc = new Scanner(System.in);
a=sc.nextInt();
b=sc.nextInt();
A oa=new A(a);
A.f(oa);
System.out.println("----------\n");
B ob=new B(a*2,b);
A.f(ob);
ob.finalize();
oa.finalize();
}
}
Java实验二
-
设计算术运算器图形用户界面
点击查看代码
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ArithOperJFrame extends JFrame implements ActionListener
{
private JTextField[] texts; //文本行数组，操作数和运算结果
private JComboBox combox; //组合框，算术运算符
private JButton button;
private String[] operators={"+","-","*","/","%"}; //算术运算符
public ArithOperJFrame()
{
super("算术运算器");
this.setSize(460,100);
this.setLocation(200,200);
this.setBackground(Color.lightGray);
this. setDefaultCloseOperation (EXIT_ON_CLOSE);//窗口关闭按钮，关闭功能设置
this.getContentPane().setLayout( new FlowLayout() ); //设置流布局
this.texts = new JTextField[3]; //文本行数组，2个操作数和1个运算结果
for (int i=0; i<this.texts.length; i++)
{
this.texts[i] = new JTextField("",6); //文本行
this.getContentPane().add(this.texts[i]);
}
this.texts[this.texts.length-1]. setEditable(false) ; //只能显示，不允许编辑
this.combox = new JComboBox( this.operators ); //设置组合框中的值
this.getContentPane().add(this.combox,1);
this.button = new JButton("=");
this.getContentPane().add(button,3);
this.button. addActionListener(this) ; //按钮注册单击事件监听器
this. setVisible(true) ; //设置窗体可见
}
public void actionPerformed(ActionEvent e) //动作事件处理方法，参数事件对象变量e
{
try{
int x = Integer.parseInt(this.texts[0].getText());
int y = Integer.parseInt(this.texts[1].getText());
switch (this.combox. getSelectedIndex() ){ //获得组合框选中序号
case 0: x+=y; break; //+
case 1: x-=y; break; //-
case 2: x*=y; break; //*
case 3: if (y!=0){ //“/”，整数除
x/=y; break;
}else{
JOptionPane. showMessageDialog (this, "除数为0，不能计算。");//显示消息对话框
this.texts[this.texts.length-1].setText("");
return;
}
case 4: x%=y; break; //%，取余数
}
this.texts[this.texts.length-1].setText(x+"");
}
catch ( NumberFormatException nfex){ //数值格式异常
try{
double x = Double.parseDouble(this.texts[0].getText());
double y = Double.parseDouble(this.texts[1].getText());
switch (this.combox. getSelectorIndex() ){ //获得组合框选中序号
case 0: x+=y; break; //+
case 1: x-=y; break; //-
case 2: x*=y; break; //*
case 3: if (y!=0){ //“/”，整数除
x/=y; break;
}else{
JOptionPane. showMessageDialog (this, "除数为0，不能计算。");//显示消息对话框
this.texts[this.texts.length-1].setText("");
return;
}
case 4: JOptionPane. showMessageDialog (this, "浮点数不能进行%运算。");//显示消息对话框
this.texts[this.texts.length-1].setText("");
return;
}
this.texts[this.texts.length-1].setText(x+"");
}
catch ( NumberFormatException ex){ //数值格式异常
JOptionPane. showMessageDialog (this,"字符串不能转换成浮点数。");//显示消息对话框
}
}
finally{}
}
public static void main(String[] arg){
new ArithOperJFrame();
}
}
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
public class GraphUI extends Frame implements
ActionListener,WindowListener {
private Label label1;
private TextField textfield1;
private Button button1;
public GraphUI(){
super ("图形界面1");
this.setSize(300,160);
this.setBackground(Color.LIGHT_GRAY);
this.setLocation(500,500);
this. setLayout (new FlowLayout());
label1 = new Label(" ");
textfield1 = new TextField(30);
button1 = new Button("button1");
this.add(label1);
this.add(textfield1);
this.add(button1);
button1. addActionListener(this) ;//注册事件
this. assWindowListener(this) ;//注册事件;
this. setVisible(true) ;//显示界面
}
public void actionPerformed(ActonEvent e) {
if(e.getSource()==button1)
System.out.println("Button clicked!") ;
}
public static void main(String[] args) {
GraphUI gui=new GraphUI() ;
}
}
class WinClose implements WindowListener {
public void windowClosing(WindowEvent e){
System.exit(0);
}
public void windowOpened(WindowEvent e){}
public void windowActivated(WindowEvent e){}
public void windowDeactivated(WindowEvent e){}
public void windowClosed(WindowEvent e){}
public void windowIconified(WindowEvent e){}
public void windowDeiconified(WindowEvent e){}
}
3.画图
import java.awt.*;
import java.awt.event.*;
public class tuxing extends Frame
implements ActionListener,ItemListener,WindowListener //写出监听接口，按首字母排列写出
{
Color color = Color.red; //画线的颜色
Panel p1;
TextField text;
Choice c;
MenuBar mb1;
Menu mf1,me1,mh1,md1;
CheckboxMenuItem cbmi1;
PopupMenu pm1;
Dialog d;
int drawG;//记录画什么图形
public tuxing()
{
super ("图形界面设计");
Label l1=new Label("画字内容");
text=new TextField("",20);
Label l2=new Label("设置颜色");
c=new Choice();
c. additem ("红色");
c. additem ("蓝色");
c. additem ("黄色");
c. additem ("绿色");
p1=new Panel();
p1. add(l1) ;
p1. add(text) ;
p1. add(l2) ;
p1. add(c) ;
add(p1,"North");
text. addActionListener(this) ; //注册文本行的事件监听程序
this. addWindowListener(this) ;//窗口监听事件注册
c. additemListener(this) ; //注册选择框事件监听程序
setSize(540,380);
setLocation(400,200);
p1.setBackground(Color.lightGray);
setBackground(Color.white);
setVisible(true);
d = new Dialog( this ,"Dialog Example",true);
d.add(new Label("打开一个对话框"),"Center");
d.setSize(120,60);
d.setLocation(500,300);
d. addWindowListener(this) ; //为对话框d注册事件监听程序
addmyMenu();
}
public void addmyMenu()
{
mb1 = new MenuBar(); //生成一个菜单栏
this. setMenuBar(mb1) ; //框架f上添加菜单栏
mf1 = new Menu("File"); //生成一个菜单
me1 = new Menu("Edit");
mh1 = new Menu("Help");
mb1.add(mf1); //菜单栏中加入菜单
mb1.add(me1);
mb1.add(mh1);
mf1.add(new MenuItem("Open")) ; //生成菜单项Open并加入到File菜单
mf1.addActionListener(this);
mf1.add(new MenuItem("画圆")) ; //生成菜单项画圆并加入到Edit菜单
mf1.add(new MenuItem("画矩形")) ; //生成菜单项画矩形并加入到Edit菜单
mf1.add(new MenuItem("画线")) ; //生成菜单项画线并加入到Edit菜单
me1.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
if (e.getSource()==text) rapaint() ;
if(e.getActionCommand()=="Open") d.setVisible(true) ;
if(e.getActionCommand()=="画圆") { drawG=1;repaint();}
if(e.getActionCommand()=="画矩形"){ drawG=2;repaint(); }
if(e.getActionCommand()=="画线") { drawG=3;repaint();}
}
public void itemStateChanged(itemEvent e) (ItemEvent e)
{
if (c.getSelectedItem()=="红色") color = Color.red; //对选择框操作时触发
if (c.getSelectedItem()=="蓝色") color = Color.blue;
if (c.getSelectedItem()=="黄色") color = Color.yellow;
if (c.getSelectedItem()=="绿色") color = Color.green;
repaint();
}
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
public void windowOpened(WindowEvent e){}
public void windowActivated(WindowEvent e){}
public void windowDeactivated(WindowEvent e){}
public void windowClosed(WindowEvent e){}
public void windowIconified(WindowEvent e){}
public void windowDeiconified(WindowEvent e){}
public void Graphics g
{
g.setColor(color);
g. drawString (text.getText(),350,350);//画字符串
if(drawG==1)g. drawOval (100,100,200,200);
if(drawG==2)g. drawRect (200,150,120,100);
if(drawG==3)g. drawLine (10,180,170,330);
}
public static void main(String arg[])
{
new tuxing();
}
}