Java程序设计2023-第四次上机练习

8-1三子棋

编写程序，实现简单的三子棋游戏。在三子棋中，双方在3×3的棋盘中轮流下棋，一方用*示，另一方用O表示。如果一方的3个棋子占据了同一行，同一列或者对角线，则该方获胜。如果棋盘已被棋子占满，但没有一方获胜则出现平局。在程序中，一方为用户，用户在界面上输入每次下棋的位置；另一方下棋的位置为随机自动生成。
在这里插入图片描述

参考代码有所修改

import java.util.Random;
import javax.swing.*;
class CheckerBoard{
    static final Integer BOUNDARY = 3;
    char[][] board;
    int count;
    int[] route;
    boolean firstPlayer;
    public CheckerBoard() {
        count = 0;
        int num = 1;
        route = new int[10];
        board = new char[5][5];
        for(int i = 1; i <= BOUNDARY; i++){
            for(int j = 1; j <= BOUNDARY; j++){
                board[i][j] = (char) ('0' + num++);
            }
        }
    }
    public void update(int local, char c) {
        int i = (local + 3 - 1) / 3;
        int j = (local - 1) % 3 + 1;
        board[i][j] = c;
        count++;
        route[count] = local;
    }
    public boolean goBack(){
        if(count <= 1){
            return false;
        }
        count-=2;
        for(int k = 1; k <= 2; k++){
            int local = route[count + k];
            int i = (local + 3 - 1) / 3;
            int j = (local - 1) % 3 + 1;
            board[i][j] = (char) (local + '0');
        }
        return true;
    }
    public boolean check(int local) {
        int i = (local + 3 - 1) / 3;
        int j = (local - 1) % 3 + 1;
        return board[i][j] == '*' || board[i][j] == 'o';
    }
    public String output() {
        StringBuilder str = new StringBuilder("-----------------------\n");
        for(int i = 1; i <= BOUNDARY; i++) {
            str.append(" |   ").append(board[i][1]).append("   |   ").append(board[i][2]).append("   |   ").append(board[i][3]).append("   |\n");
            str.append("------------------------\n");       
        }
        return str.toString();
    }
    public boolean isExceed(int local) {return local < 1 || local > 9 ;}
    public boolean isWin() {
        //判断行列
        for(int i = 1; i <= BOUNDARY; i++) {
            if(board[i][1] == board[i][3] && board[i][2] == board[i][1])return true;
            if(board[1][i] == board[3][i] && board[2][i] == board[1][i])return true;
        }
        //判断对角线
        if(board[1][1] == board[3][3] && board[1][1] == board[2][2])return true;
        return board[1][3] == board[3][1] && board[1][3] == board[2][2];
    }
}
public class TicTacToe {
    static CheckerBoard b = new CheckerBoard();
    public static void robotPut () {
        Random rand = new Random();
        int local = rand.nextInt(9) + 1;
        while(b.check(local)) {
            local = rand.nextInt(9) + 1;
        }
        b.update(local, 'o');
    }
    public static void userPut() {
        UIManager.put("OptionPane.cancelButtonText", "撤销");
        String s = JOptionPane.showInputDialog(b.output() + "请输入位置:");
        while("".equals(s) || s == null || b.isExceed(Integer.parseInt(s)) || b.check(Integer.parseInt(s))) {
            if(s == null){
                if(b.goBack()){
                    JOptionPane.showMessageDialog(null, "撤销成功!");
                }else{
                    JOptionPane.showMessageDialog(null, "撤销失败!","提示",JOptionPane.ERROR_MESSAGE);
                }
                userPut();
                return;
            }
            JOptionPane.showMessageDialog(null, "输入有误, 请重新输入!","提示",JOptionPane.ERROR_MESSAGE);
            s = JOptionPane.showInputDialog(b.output() + "请输入位置:");
        }
        b.update(Integer.parseInt(s), '*');
    }
    public static void main(String[] args) {
    	int f=JOptionPane.showConfirmDialog(null,"你是否要先下？","选择",JOptionPane.YES_NO_CANCEL_OPTION);
    	boolean curPlayer=true;
    	if(f==0) {curPlayer=true;JOptionPane.showMessageDialog(null,"你先下!");}
    	else if(f==1){curPlayer=false;JOptionPane.showMessageDialog(null,"机器人先下!");}
    	else System.exit(0);
        if(curPlayer) {
            userPut();
        } else {
            robotPut();
        }
        curPlayer = !curPlayer;
        while(!b.isWin()) {
            if(b.count == 9) {//判断是否平局
                JOptionPane.showMessageDialog(null,b.output() + "平局!");
                System.exit(0);
            }
            if(curPlayer) {
                userPut();
            } else {
                robotPut();
            }
            curPlayer = !curPlayer;
        }
        String str = curPlayer ? "机器人" : "你";
        if(str.equals("机器人"))JOptionPane.showMessageDialog(null, b.output()+"很遗憾，你输了！");
        JOptionPane.showMessageDialog(null, b.output() + "恭喜你赢了!");
        System.exit(0);
    }
}

8-3绘制随机图形

定义4个类，MyShape、MyLine、MyRectangle和MyOval，其中MyShape是其他三个类的父类。MyShape为抽象类，包括图形位置的四个坐标；一个无参的构造方法，将所有的坐标设置为0；一个带参的构造函数，将所有的坐标设置为相应值；每个坐标的设置和读取方法；abstract void draw(Graphics g)方法。MyLine类负责画直线，实现父类的draw方法；MyRectangle负责画矩形，实现父类的draw方法；MyOval负责画椭圆，实现父类的draw方法。编写一个应用程序，使用上面定义的类，随机选取位置和形状，绘制20个图形。
在这里插入图片描述

参考代码

package ticTacToe.pack;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JComponent;
import javax.swing.JFrame;
 
abstract class MyShape{
	double a;double b;double c;double d;
	public MyShape(){
		a=0;b=0;c=0;d=0;
	}
	public MyShape(double a,double b,double c,double d) {
		this.a=a;this.b=b;this.c=c;this.d=d;
	}
	public double getA() {
		return a;
	}
	public void setA(int a) {
		this.a = a;
	}
	public double getB() {
		return b;
	}
	public void setB(int b) {
		this.b = b;
	}
	public double getC() {
		return c;
	}
	public void setC(int c) {
		this.C = c;
	}
	public double getD() {
		return d;
	}
	public void setD(int d) {
		this.d = d;
	}
	abstract void draw(Graphics g);
}
class MyLine extends MyShape{
	public MyLine(double a,double b,double c,double d) {
		super(a,b,c,d);
	}
	void draw(Graphics g) {
		Graphics2D g2=(Graphics2D )g;
		Line2D line=new Line2D.Double(this.a,this.b,this.c,this.d);
		g2.draw(line);
	}
}
class MyRectangle extends MyShape{
	public MyRectangle(double a,double b,double c,double d) {
		super(a,b,c,d);
	}
	void draw(Graphics g) {
		Graphics2D g2=(Graphics2D )g;
		Rectangle2D rectangle=new Rectangle2D.Double(this.a,this.b,this.c,this.d);
		g2.draw(rectangle);
	}
}
class MyOval extends MyShape{
	public MyOval(double a,double b,double c,double d) {
		super(a,b,c,d);
	}
	void draw(Graphics g) {
		Graphics2D g2=(Graphics2D )g;
		Ellipse2D ellipse=new Ellipse2D.Double(this.a,this.b,this.c,this.d);
		g2.draw(ellipse);
	}
}
 
public class Paint{
	public static void main(String []args) {
		EventQueue.invokeLater(new Runnable()
	   	{
	   	   public void run()
		   {
              JFrame Frame = new JFrame();
              Frame.add(new DrawComponent());
              Frame.pack();
              Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              Frame.setVisible(true);
		  }
	  });
		
	}
}
class DrawComponent extends JComponent
{
	private static final int DEFAULT_WIDTH=500;
	private static final int DEFAULT_HEIGHT=500;
 
	public void paintComponent(Graphics g)
	{
		for(int i=0;i<20;i++) {
			double a = Math.random()*300;
			double b = Math.random()*300;
			double c = Math.random()*300;
			double d = Math.random()*300;
			if(i<6) {
				MyOval aMyOval = new MyOval(a, b, c, d);
				aMyOval.draw(g);
			}
			else if(i<12) {
				MyRectangle aMyRectangle = new MyRectangle(a, b, c, d);
				aMyRectangle.draw(g);
			}
			else {
				MyLine aLine = new MyLine(a, b, c, d);
				aLine.draw(g);
			}
		}
	}
 
   public Dimension getPreferredSize()
   {
	  	return new Dimension(DEFAULT_WIDTH,DEFAULT_HEIGHT);
   }
}

8-4猜数游戏

编写一个猜数程序，该程序随机在1到1000的范围中选择一个供用户猜测的整数。界面上提供一个文本框来接收用户输入的猜测的数，如果用户猜得太大，则背景变为红色，如果猜得太小，背景变为蓝色。用户猜对后，文本框变为不可编辑，同时提示用户猜对了。界面上提供一个按钮，使用户可以重新开始这个游戏。在界面上还需显示用户猜测的次数。
实验步骤：
(1) 定义继承自JFrame的类，在该类中添加界面各部分；
(2) 定义事件监听器类完成事件处理；
(3) 定义一个包含main方法的测试类，在该类中创建框架类对象，并显示。
实验提示：
(1) 使用面板进行页面布局；
(2) 可以使用内部类定义事件监听器类；
(3) 按钮点击通过处理ActionEvent事件来完成响应。
在这里插入图片描述

参考代码

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
class Gs extends JPanel implements ActionListener{
   private int cnt;
   private int truenb;
   private JPanel all;
   private JLabel lb1,lb2,lb3,lb4,lb5;
   private JButton bnt1,bnt2,bnt3;
   private JTextField inp;
   private JFrame jf;
   public void generate(){
      //生成随机数作为答案
      Random r=new Random();
      truenb=r.nextInt(1000)+1;
   }
   public Gs(){
      cnt=0;
      generate();
      //生成所有物件的容器
      all=new JPanel();
      all.setLayout(null);  
       all.setBounds(100,80,350,200);

      // JLabel提示信息
      lb1= new JLabel("你已经猜了"+cnt+"次"); //已经猜了x次
      lb1.setBounds(0, 5, 150, 20);
      lb1.setFont(new Font("宋体",Font.BOLD,14));
      // lb1.setVisible(true);
      all.add(lb1);

      lb2=new JLabel(); //输入猜测的数
      lb2.setText("输入猜测的数");
      lb2.setFont(new Font("宋体",Font.BOLD,14));
      lb2.setBounds(10, 40, 110, 20);
      all.add(lb2);     

       inp=new JTextField(); //输入框
      inp.setBounds(110, 40, 120, 20);
      inp.setBackground(Color.WHITE);
      all.add(inp);
      
      lb3=new JLabel(); //太大or太小
      lb3.setFont(new Font("宋体",Font.BOLD,14));
      lb3.setBounds(240, 40, 120, 20);
      lb3.setVisible(false);
      all.add(lb3);

      lb4=new JLabel("恭喜你猜对了");
      lb4.setFont(new Font("宋体",Font.BOLD,14));
      lb4.setBounds(10, 125, 120, 20);
      lb4.setVisible(false);
      all.add(lb4);

      lb5=new JLabel("猜测范围在1—~1000之间");
      lb5.setFont(new Font("宋体",Font.BOLD,14));
      lb5.setBounds(10,60,180,20);
      all.add(lb5);
      
      bnt1=new JButton("确定");
      bnt1.setBounds(10, 90, 90, 30);
      all.add(bnt1);

      bnt2=new JButton("重新开始");
      bnt2.setBounds(120, 90, 90, 30);
      
      all.add(bnt2);

      bnt3=new JButton("退出");
      bnt3.setBounds(230, 90, 90, 30);
      all.add(bnt3);

      //给按钮添加事件监听
      bnt1.addActionListener(this);    //传this指针方便判断
      bnt2.addActionListener(this);
      bnt3.addActionListener(this);

      //将Jpanel加入Jframe
      jf=new JFrame();
      jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      jf.setTitle("猜数游戏");
      // jf.setLayout(null);
      jf.setBounds(250,200,350,200);
      jf.add(all);
      jf.setVisible(true);
   }
   public void actionPerformed(ActionEvent e){
      if(e.getSource()==bnt1){   //确定按钮
         cnt++;
         lb1.setText("您已经猜了"+cnt+"次");
         int gus=Integer.valueOf(inp.getText());
         if(gus<truenb){   //太小
            lb3.setVisible(true);
            lb3.setText("太小");
            all.setBackground(Color.BLUE);
         }
         else if(gus>truenb){    //太大
            lb3.setVisible(true);
            lb3.setText("太大!");
            all.setBackground(Color.RED);
         }
         else{    //猜对了
            lb4.setVisible(true);
            inp.setEditable(false);    //禁止用户编辑
            bnt1.setEnabled(false);    //禁止按确认按钮
            lb3.setVisible(false);
            all.setBackground(Color.GREEN);
         }
      }else if(e.getSource()==bnt2)     //重开
      {
         cnt=0;      //重开次数置零
         lb1.setText("您已经猜了"+cnt+"次");
         generate(); //生成新数
         all.setBackground(null);   //清除背景色
         inp.setText(null);      //清空输入框
         inp.setEditable(true);
         lb4.setVisible(false);  //胜利提示关掉
         bnt1.setEnabled(true);    //允许按确认按钮
         lb3.setVisible(false);
      }else {       //退出
         System.exit(0);
      }
   }
}
public class guess {
   public static void main(String[] args) {
      new Gs();
   }
}