之前几个案例代码总结

作者: linhaoyou | 来源:发表于2017-07-06 09:39 被阅读0次

总结：

import java.awt.*;

public class MyBall{
    public static void main(String[] args){
        Frame w = new Frame();      
        w.setSize(300, 400);
        
        MyPanel mp = new MyPanel();
        w.add(mp);
        
        Thread t = new Thread(mp);
        t.start();
        
        w.show();
    }
}

class MyPanel extends Panel implements Runnable{
    int x = 30;
    int y = 30;
    int att = 0;
    public void paint(Graphics g){      
        g.fillOval(x, y, 20, 20);       
    }
    
    public void run(){
        while(true){    
        
            if(att == 0){
                x++;
                y++;
            }
            if(att == 1){
                x--;
                y++;
            }
            if(att == 2){
                x--;
                y--;
            }
            if(att == 3){
                x++;
                y--;
            }
            
            if(x > 263){
                if(att == 0){
                    att = 1;
                }else{
                    att = 2;
                }
            }
            if(y > 341){
                if(att == 1){
                    att = 2;
                }else{
                    att =3;
                }
            }
            if(x < 0){
                if(att == 2){
                    att = 3;
                }else{
                    att = 0;
                }
            }
            if(y < 0){
                if(att == 3){
                    att = 0;
                }else{
                    att = 1;
                }
            }
            try{
                Thread.sleep(30);
            }catch(Exception e){
                
            }
            repaint();
        }
    }
}

运行结果：（画斜线的小球，撞墙会改变方向）

图片.png

import java.awt.*;
import java.awt.event.*;

public class MyBall2{
    public static void main(String[] args){
        Frame w = new Frame();
        w.setSize(300, 400);
        
        MyPanel mp = new MyPanel();
        w.add(mp);
        
        w.addKeyListener(mp);
        mp.addKeyListener(mp);
        
        w.show();
    }
}

class MyPanel extends Panel implements KeyListener{
    int x = 30;
    int y = 30;
    public void paint(Graphics g){
        g.fillOval(x, y, 20, 20);
    }
    
    @Override
    public void keyPressed(KeyEvent arg0){
        if(arg0.getKeyCode() == 37){
            x--;
        }
        if(arg0.getKeyCode() == 38){
            y--;
        }
        if(arg0.getKeyCode() == 39){
            x++;
        }
        if(arg0.getKeyCode() == 40){
            y++;
        }
        repaint();
    }
    
    @Override
    public void keyReleased(KeyEvent arg0){
        
    }
    
    @Override
    public void keyTyped(KeyEvent arg0){
        
    }
}

运行结果：（键盘上的上下左右键控制小球）

图片.png

import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

public class MyChar{
    public static void main(String[] args){
        Frame w = new Frame();
        w.setSize(300, 400);
        
        MyPanel mp = new MyPanel();
        w.add(mp);
        
        w.addKeyListener(mp);
        mp.addKeyListener(mp);
        
        Thread t = new Thread(mp);
        t.start();
        
        w.show();
    }
}

class MyPanel extends Panel implements Runnable,KeyListener{
    int[] x = new int[10];
    int[] y = new int[10];
    char[] c = new char[10];
    int score = 1000;
    
    public MyPanel(){
        for(int i=0; i<10;i++){
            x[i] = (int)(Math.random()*300);
            y[i] = (int)(Math.random()*300);
            c[i] = (char)(Math.random()*26 + 97);
        }       
    }
    
    public void paint(Graphics g){
        g.setColor(Color.BLACK);
        for(int i=0;i<10;i++){
            g.drawString(new Character(c[i]).toString(), x[i], y[i]);
        }
        g.setColor(Color.RED);
        g.drawString("你的成绩是："+score, 5, 15);
    }
    
    public void run(){
        while(true){
            for(int i=0;i<10;i++){
                y[i]++;
                if(y[i]>400){
                    y[i] = 0;
                    x[i] = (int)(Math.random()*300);
                    c[i] = (char)(Math.random()*26 + 97);
                    score -= 100;
                }
            }
            
            try{
                Thread.sleep(30);
            }catch(Exception e){
                
            }
            repaint();
        }
    }
    
    @Override
    public void keyPressed(KeyEvent arg0){
        char keyC = arg0.getKeyChar();
        int nowY = -1;
        int nowIndex = -1;

        for(int i=0;i<10;i++){
            if(keyC == c[i]){
                if(y[i]>nowY){
                    nowY = y[i];
                    nowIndex = i;
                }               
            }
        }
        
        if(nowIndex != -1){
            y[nowIndex] = 0;
            x[nowIndex] = (int)(Math.random()*300);
            c[nowIndex] = (char)(Math.random()*26 + 97);
            score += 10;
        }else{
            score -= 100;
        }
    }
    
    @Override
    public void keyReleased(KeyEvent arg0){
        
    }
    
    @Override
    public void keyTyped(KeyEvent arg0){
        
    }
}

运行结果：（打字游戏）

图片.png

import java.awt.*;

public class MySnow{
    public static void main(String[] args){
        Frame w = new Frame();
        w.setSize(1024, 768);
        w.setBackground(Color.BLACK);
        
        MyPanel mp = new MyPanel();
        w.add(mp);
        
        Thread t = new Thread(mp);
        t.start();
        
        w.show();
    }
}

class MyPanel extends Panel implements Runnable{
    int x[] = new int[300];
    int y[] = new int[300];
    
    public MyPanel(){
        for(int i=0;i<300;i++){
            x[i] = (int)(Math.random()*1024);
            y[i] = (int)(Math.random()*768);
        }
    }
    
    public void paint(Graphics g){
        g.setColor(Color.WHITE);
        for(int i=0;i<300;i++){
            g.drawString("*",x[i], y[i]);
        }       
    }
    
    public void run(){
        while(true){
            try{
                for(int i=0; i<300; i++){
                    y[i]++;
                    if(y[i]>768){
                        y[i] = 0;
                    }
                }
                Thread.sleep(30);
            }catch(Exception e){
                
            }
            repaint();
        }
    }
}

运行结果：（下雪）

图片.png

import java.awt.Frame;
import java.awt.*;

public class MyTest{
    public static void main(String args[]){
        Frame w = new Frame();
        w.setSize(300, 400);
        
        MyPanel mp = new MyPanel();
        w.add(mp);
        
        w.show();
    }
}

class MyPanel extends Panel{
    public void paint(Graphics g){
        g.setColor(Color.BLUE);
        g.drawLine(30, 30, 100, 100);
        g.fillOval(30, 30, 50, 100);
    }
}

运行结果：（画斜线和椭圆）

图片.png

import java.awt.*;
import java.lang.Math;

public class MyTest2{
    public static void main(String[] args){
        Frame w = new Frame();
        
        w.setSize(1024,768);
        w.setBackground(Color.BLACK);
        
        MyPanel2 mp = new MyPanel2();
        w.add(mp);
        
        w.show();
    }
}

class MyPanel2 extends Panel{
    public void paint(Graphics g){
        g.setColor(Color.WHITE);
        for(int i = 0 ; i < 300; i++){
            g.drawString("*", (int)(Math.random()*1024), 
                    (int)(Math.random()*768));
        }       
    }
}

运行结果：（画满天星星）

图片.png

import java.awt.*;
import javax.swing.*;

public class MyBall{
    public static void main(String[] args){
        JFrame w = new JFrame();
        w.setSize(300, 400);
        
        MyPanel mp = new MyPanel();
        w.add(mp);
        
        Thread t = new Thread(mp);
        t.start();
        
        w.setVisible(true);
    }
}

class MyPanel extends JPanel implements Runnable{
    int x = 30;
    int y = 30;
    public void paint(Graphics g){
        super.paint(g);
        g.fillOval(x, y, 20, 20);
    }
    
    public void run(){
        while(true){
            y++;
            if(y>400){
                y = 0;
            }
            
            try{
                Thread.sleep(20);
            }catch(Exception e){
                
            }
            repaint();
        }
    }
}

运行结果：（下落小球）

图片.png

import java.awt.*;
import javax.swing.*;

public class MyButton{
    public static void main(String[] args){
        JFrame w = new JFrame();
        w.setSize(300, 400);
        
        JButton b1 = new JButton("OK1");
        JButton b2 = new JButton("OK2");
        JButton b3 = new JButton("OK3");
        JButton b4 = new JButton("OK4");
        JButton b5 = new JButton("OK5");
        
        //设置布局
        w.setLayout(new FlowLayout());
        
        w.add(b1);
        w.add(b2);
        w.add(b3);
        w.add(b4);
        w.add(b5);
        
        w.setVisible(true);
    }
}

运行结果：（画按钮）

图片.png

public class MyTest{
    public static void main(String args[]){
        String s1 = new String("abc");
        String s2 = new String("abc");
        String s3 = "abc";
        String s4 = "abc";
        System.out.println(s1==s2);
        System.out.println(s3==s4);
        System.out.println("abc".hashCode());
    }
}

运行结果：

图片.png

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class QQLogin implements ActionListener{
    public static void main(String args[]){
        JFrame w = new JFrame();
        w.setSize(250, 125);
        
        //new 组件
        JLabel labUser = new JLabel("用户名");
        JLabel labPass = new JLabel("密码");
        
        JTextField txtUser = new JTextField();
        JPasswordField txtPass = new JPasswordField();
        
        JButton btnLogin = new JButton("登录");
        JButton btnReg = new JButton("注册");
        JButton btnCancel = new JButton("取消");
        
        //注册事件监听
        QQLogin e = new QQLogin();
        btnLogin.addActionListener(e);
        btnReg.addActionListener(e);
        btnCancel.addActionListener(e);
        
        //布置输入面板
        JPanel panInput = new JPanel();
        panInput.setLayout(new GridLayout(2, 2));
        
        panInput.add(labUser);
        panInput.add(txtUser);
        
        panInput.add(labPass);
        panInput.add(txtPass);
        
        //布置按钮面板
        JPanel panButton = new JPanel();
        panButton.setLayout(new FlowLayout());
        
        panButton.add(btnLogin);
        panButton.add(btnReg);
        panButton.add(btnCancel);
        
        //布置窗体
        w.setLayout(new BorderLayout());
        
        w.add(panInput, BorderLayout.CENTER);
        w.add(panButton, BorderLayout.SOUTH);
        
        w.setVisible(true);
    }
    
    @Override
    public void actionPerformed(ActionEvent arg0){
        if(arg0.getActionCommand().equals("登录")){
            System.out.println("用户点击了登录");
        }
        if(arg0.getActionCommand().equals("注册")){
            System.out.println("用户点击了注册");
        }
        if(arg0.getActionCommand().equals("取消")){
            System.out.println("用户点击了取消");
        }
    }
}

运行结果：

图片.png

import java.awt.*;
import javax.swing.*;

public class QQMain{
    public static void main(String args[]){
        JFrame w = new JFrame();
        w.setSize(300, 400);
        
        //new 组件
        JTextField txtMess = new JTextField();
        
        JComboBox cmbUser = new JComboBox();
        JButton btnSend = new JButton("发送");
        
        JTextArea txtContent = new JTextArea();
        //设置滚动条
        JScrollPane spContent = new JScrollPane(txtContent);
        
        //布置小面板
        JPanel panSmall = new JPanel();
        panSmall.setLayout(new GridLayout(1,2));
        
        panSmall.add(cmbUser);
        panSmall.add(btnSend);
        
        //布置大面板
        JPanel panBig = new JPanel();
        panBig.setLayout(new GridLayout(2, 1));
        
        panBig.add(txtMess);
        panBig.add(panSmall);
        
        //布置窗体
        w.setLayout(new BorderLayout());
        
        w.add(panBig, BorderLayout.NORTH);
        w.add(spContent, BorderLayout.CENTER);
        
        w.setVisible(true);
    }
}

图片.png

之前几个案例代码总结

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