//定义一个接口Shape,有两判指个抽象方法:getArea()和getPerimeter()interface Shape { double getArea() double getPerimeter()
}//定义一个类Circle,实现Shape接口class Circle implements Shape { //定义一个私有属性radius,表示圆的半径
private double radius //定义一个公有构造方法,用于初始化radius
public Circle(double radius) {this.radius = radius
} //实现getArea()方法,返回圆的面积
public double getArea() {return Math.PI * radius * radius
} //实现getPerimeter()方法,返回圆的周长
public double getPerimeter() {return Math.PI * radius * 2
}
}//定义一个类Rectangle,实现Shape接口class Rectangle implements Shape { //定义两个私有属性width和height,表示矩形的宽度和高度
private double width private double height //定义一个公有构造方法,用于初始化width和height
public Rectangle(double width, double height) {this.width = width this.height = height
} //实现getArea()方法,返回矩形的面积
public double getArea() {return width * height
} //实现getPerimeter()方法,返回矩形的周长
public double getPerimeter() { return (width + height) *2
}
}//定义一个类Triangle,实现Shape接口class Triangle implements Shape { //定义三个私有属性a,b,c表示三角形的三条边长
private double a private double b private double c //定义一个公有构造方法,用于初始化a,b,c,并检查是否满足三角形条件(任意两边之和大于第三边)
public Triangle(double a, double b, double c) throws Exception{ if (a + b >c &&a + c >b &&b + c >a) {
this.a = a this.b = b
this.c = c
} else {
throw new Exception("Invalid triangle")
}
} //实现getArea()方法,返回三角形的面积(使用海伦公式)
public double getArea() { //计算半周长p
double p = (a + b + c) /2//计算并返回面积s(使用Math.sqrt()函数求平方根)
return Math.sqrt(p * (p - a) * (p - b) * (p - c))
}//实现getPerimeter()方法,返回三角形的周长
public double getPerimeter(){ return a + b + c
}
}//定义一个类Square,继承Rectangle类,并重写构造方法和toString()方法class Square extends Rectangle { //重写构造方法,在调用父类构造方法时传入相弊者同的参数side作为width和height
public Square(double side){ super(side, side)
} //重写toString()方法,在原来基础上加上"Square:"前缀,并只显示side属性而不显示width和height属性(使用String.format()函数格式化字符串)
@Override
public String toString(){ return String.format("Square: side=%.2f", super.width) /* 或者直接使用super.getPerimeter()/4作为side */
/* return String.format("Square: side=%.2f", super.getPerimeter()/4)*/
/* 注意:不能直接访问super.side属性,
贪吃蛇游戏 望采纳import java.awt.Button
import java.awt.Color
import java.awt.GridLayout
import java.awt.Point
import java.awt.event.KeyEvent
import java.awt.event.KeyListener
import java.util.*
import javax.swing.JFrame
import javax.swing.JOptionPane
public class Snake extends JFrame implements KeyListener{
int Count=0
Button[][] grid = new Button[20][20]
ArrayList<Point>snake_list=new ArrayList<Point>()
Point bean=new Point(-1,-1)//保存随机豆子【坐标】
int Direction = 1//方向标志 1:上2:下 3:左 4:右
//构造方法
public Snake()
{
//窗体初始化
this.setBounds(400,300,390,395)
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
GridLayout f=new GridLayout(20,20)
this.getContentPane().setBackground(Color.gray)
this.setLayout(f)
//初始化20*20个按钮
for(int i=0i<20i++)
for(int j=0j<20j++)
{
grid[i][j]=new Button()
this.add(grid[i][j])
grid[i][j].setVisible(false)
grid[i][j].addKeyListener(this)
grid[i][j].setBackground(Color.blue)
}
//蛇体初始化
grid[10][10].setVisible(true)
grid[11][10].setVisible(true)
grid[12][10].setVisible(true)
grid[13][10].setVisible(true)
grid[14][10].setVisible(true)
//在动态数组中保存蛇体按钮坐毁歼蔽标【行列】信息
snake_list.add(new Point(10,10))
snake_list.add(new Point(11,10))
snake_list.add(new Point(12,10))
snake_list.add(new Point(13,10))
snake_list.add(new Point(14,10))
this.rand_bean()
this.setTitle("总分:0")
this.setVisible(true)
}
//该方法随机一个豆子,且不在蛇体上,并使豆子可见
public void rand_bean(){
Random rd=new Random()
do{
bean.x=rd.nextInt(20)//纤州行
bean.y=rd.nextInt(20)//列
}while(snake_list.contains(bean))
grid[bean.x][bean.y].setVisible(true)
grid[bean.x][bean.y].setBackground(Color.red)
}
//判断拟增蛇头是否与自身有碰撞改含
public boolean is_cross(Point p){
boolean Flag=false
for(int i=0i<snake_list.size()i++){
if(p.equals(snake_list.get(i) )){
Flag=truebreak
}
}
return Flag
}
//判断蛇即将前进位置是否有豆子,有返回true,无返回false
public boolean isHaveBean(){
boolean Flag=false
int x=snake_list.get(0).x
int y=snake_list.get(0).y
Point p=null
if(Direction==1)p=new Point(x-1,y)
if(Direction==2)p=new Point(x+1,y)
if(Direction==3)p=new Point(x,y-1)
if(Direction==4)p=new Point(x,y+1)
if(bean.equals(p))Flag=true
return Flag
}
//前进一格
public void snake_move(){
if(isHaveBean()==true){//////////////有豆子吃
Point p=new Point(bean.x,bean.y)//【很重要,保证吃掉的是豆子的复制对象】
snake_list.add(0,p)//吃豆子
grid[p.x][p.y].setBackground(Color.blue)
this.Count++
this.setTitle("总分:"+Count)
this.rand_bean() //再产生一个豆子
}else{///////////////////无豆子吃
//取原蛇头坐标
int x=snake_list.get(0).x
int y=snake_list.get(0).y
//根据蛇头坐标推算出拟新增蛇头坐标
Point p=null
if(Direction==1)p=new Point(x-1,y)//计算出向上的新坐标
if(Direction==2)p=new Point(x+1,y)//计算出向下的新坐标
if(Direction==3)p=new Point(x,y-1)//计算出向左的新坐标
if(Direction==4)p=new Point(x,y+1)//计算出向右的新坐标
//若拟新增蛇头碰壁,或缠绕则游戏结束
if(p.x<0||p.x>19|| p.y<0||p.y>19||is_cross(p)==true){
JOptionPane.showMessageDialog(null, "游戏结束!")
System.exit(0)
}
//向蛇体增加新的蛇头坐标,并使新蛇头可见
snake_list.add(0,p)
grid[p.x][p.y].setVisible(true)
//删除原蛇尾坐标,使蛇尾不可见
int x1=snake_list.get(snake_list.size()-1).x
int y1=snake_list.get(snake_list.size()-1).y
grid[x1][y1].setVisible(false)
snake_list.remove(snake_list.size()-1)
}
}
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_UP &&Direction!=2) Direction=1
if(e.getKeyCode()==KeyEvent.VK_DOWN &&Direction!=1) Direction=2
if(e.getKeyCode()==KeyEvent.VK_LEFT &&Direction!=4) Direction=3
if(e.getKeyCode()==KeyEvent.VK_RIGHT &&Direction!=3) Direction=4
}
@Override
public void keyReleased(KeyEvent e) { }
@Override
public void keyTyped(KeyEvent e) { }
public static void main(String[] args) throws InterruptedException {
Snake win=new Snake()
while(true){
win.snake_move()
Thread.sleep(300)
}
}
}
import java.awt.Dimensionimport java.awt.Graphics
import java.awt.event.ActionEvent
import java.awt.event.ActionListener
import javax.swing.JButton
import javax.swing.JFrame
import javax.swing.JPanel
public class Painter extends JFrame{
/**
*
*/
private static final long serialVersionUID = 8160427604782702376L
CanvasPanel canvas = new CanvasPanel()
public Painter() {
super("Star")
this.add(canvas)
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
this.pack()
this.setResizable(false)
this.setLocationRelativeTo(null)
this.setVisible(true)
}
public static void main(String[] args) {
new Painter()
}
}
class CanvasPanel extends JPanel implements ActionListener{
/**
*
*/
private static final long serialVersionUID = -4642528854538741028L
private JButton[] btn = new JButton[4]
private String[] btn_name = {"+", "-", "R", "L"}
private int center_x = 200, center_y = 200, radius = 100, degree = 0
public CanvasPanel() {
this.setPreferredSize(new Dimension(400, 500))
this.setLayout(null)
for(int i = 0i <4i++) {
btn[i] = new JButton(btn_name[i])
btn[i].setBounds(160 + i * 60, 425, 50, 50)
btn[i].addActionListener(this)
this.add(btn[i])
}
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g)
for(int i = 0i <5i++) {
g.drawLine( (int) (center_x + radius * Math.sin(Math.toRadians(degree + 72 * i))),
(int) (center_y - radius * Math.cos(Math.toRadians(degree + 72 * i))),
(int) (center_x + radius * Math.sin(Math.toRadians(degree + 72 * i + 144))),
(int) (center_y - radius * Math.cos(Math.toRadians(degree + 72 * i + 144))))
}
}
public void actionPerformed(ActionEvent e) {
/知派/ TODO Auto-generated method stub
if(e.getActionCommand() == "+") {
if(radius <答猛吵 200)
radius += 2
repaint()
} else if(e.getActionCommand() == "-") {
if(radius >0)
radius -= 2
repaint()
} else if(e.getActionCommand() == "清侍R") {
degree = (degree + 2) % 360
repaint()
} else if(e.getActionCommand() == "L") {
degree = (degree - 2) % 360
repaint()
}
}
}
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