How to write a submarine game using Java?

First is the window defined in the main method (these are fixed formats, it’s okay if you don’t know how to do it, just Ctrl c v, you can basically understand it just by looking at the data)

Write one Super class, the super class needs to have the width and height of submarines, depth charges, mines and battleships, as well as the x and y coordinates when they appear, and their movement speed. Pictures of all objects, movement methods of all objects, and collision

Then write the derived class. According to defeating a mine submarine, the battleship will gain one life, and defeating other submarines, the battleship will gain points, so it needs to be defined Two interfaces, one is used to add lives, the other is used to add points

The complete code is as follows (you can find pictures yourself, just change the Image class and the width and height of each object)

Game World World Class

package cn.tedu.sunarine;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Graphics;
import java.util.Arrays;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
//整个游戏世界
public class World extends JPanel {
    public static final int WIDTH = 641;
    public static final int HEIGHT = 479;
 
 
    public static final int RUNNING =0;
    public static final int GAME_OVER=1;
    private int state = RUNNING;
 
    //窗口所显示的对象
    private Battleship ship = new Battleship(); //战舰
    private SeaObject[] submarines = {}; //潜艇(侦察潜艇、鱼雷潜艇、水雷潜艇)
    private Mine[] mines = {}; //水雷
    private Bomb[] bombs = {}; //深水炸弹
 
 
    //随机生成潜艇
    public SeaObject nextSubmarine(){
        Random rand = new Random();
        int type = rand.nextInt(30);
        if(type<10){
            return new ObserveSubmarine();
        }else if(type<15){
            return new TorpedoSubmarine();
        }else{
            return new MineSubmarine();
        }
    }
 
    private int subEnterIndex = 0;
    //潜艇入场
    public void submarineEnterAction(){ //每10毫秒走一次
        subEnterIndex++;
        if(subEnterIndex%40==0){ //每40毫秒
            SeaObject obj = nextSubmarine();
            submarines = Arrays.copyOf(submarines,submarines.length+1);
            submarines[submarines.length-1] = obj;
        }
    }
 
    private int mineEnterIndex = 0;
    //鱼雷，水雷入场
    public void MineEnterAction(){
        mineEnterIndex++;
        if(mineEnterIndex%100==0){
            for (int i=0;i<submarines.length;i++){
                if (submarines[i] instanceof  MineSubmarine){
                    if (submarines[i].isLIVE()) {
                        MineSubmarine ms = (MineSubmarine) submarines[i];
                        Mine obj = ms.shootMine();
                        mines = Arrays.copyOf(mines, mines.length + 1);
                        mines[mines.length - 1] = obj;
                    }
                }
            }
        }
    }
 
    public void gameOver(){
        if (ship.getLife()<=0){
            state = GAME_OVER;
        }
    }
 
    //海洋对象移动
    public void moveAction(){
        for(int i=0;i<submarines.length;i++){
            submarines[i].move();
        }
        for(int i=0;i<mines.length;i++){
            mines[i].move();
        }
        for(int i=0;i<bombs.length;i++){
            bombs[i].move();
        }
    }
 
    //删除越界对象
    public void outOfBoundsAction(){
        for(int i=0;i<submarines.length;i++){
            if(submarines[i].isOutOfBounds()){
                submarines[i] = submarines[submarines.length-1];
                submarines = Arrays.copyOf(submarines,submarines.length-1);
            }
        }
 
        for(int i=0;i<mines.length;i++){
            if(mines[i].isOutOfBounds()){
                mines[i] = mines[mines.length-1];
                mines = Arrays.copyOf(mines,mines.length-1);
            }
        }
 
        for(int i=0;i<bombs.length;i++){
            if(bombs[i].isOutOfBounds()){
                bombs[i] = bombs[bombs.length-1];
                bombs = Arrays.copyOf(bombs,bombs.length-1);
            }
        }
    }
 
    private  int score = 0;
 
    public void BombsBangAction(){
//深水炸弹炸潜艇
        for (int i=0;i<bombs.length;i++){
            Bomb b =bombs[i];
            for (int j=0;j<submarines.length;j++){
                SeaObject s = submarines[j];
                if (b.isLIVE()&& s.isLIVE()&&s.isHit(b)){
                    b.goDead();
                    s.goDead();
                    if (s instanceof EnemyScore){
                        EnemyScore es = (EnemyScore) s;
                        score += es.getScore();
                    }
                    if (s instanceof EnemyLife){
                        EnemyLife ea = (EnemyLife) s;
                        int num = ea.getLife();
                        ship.addLife(num);
                    }
 
                }
            }
        }
    }
 
    public void mineBangAction(){
        for (int i=0;i<mines.length;i++){
            Mine m= mines[i];
            if (m.isLIVE()&& ship.isLIVE()&&m.isHit(ship)){
                m.goDead();
                ship.subtratLife();
            }
        }
    }
 
 
    /** 启动程序的运行 */
    public void action(){
        KeyAdapter k = new KeyAdapter(){
 
            public void keyPressed(KeyEvent e) {
                if(e.getKeyCode() == KeyEvent.VK_SPACE){
                    Bomb obj = ship.shoot(); //深水炸弹入场
                    bombs = Arrays.copyOf(bombs,bombs.length+1);
                    bombs[bombs.length-1] = obj;
                }
                if(e.getKeyCode() == KeyEvent.VK_LEFT){
                    ship.moveLeft();
                }
                if(e.getKeyCode() == KeyEvent.VK_RIGHT){
                    ship.moveRight();
                }
            }
        };
        this.addKeyListener(k);
 
        Timer timer = new Timer();
        int interval = 10;
        timer.schedule(new TimerTask() {
            public void run() {
                submarineEnterAction(); //潜艇(侦察、水雷、鱼雷)入场
                MineEnterAction();      //水雷入场
                moveAction();           //海洋对象移动
                BombsBangAction();      //深水炸弹和潜艇碰撞
                mineBangAction();       //水雷和战舰碰撞
                outOfBoundsAction();    //删除越界的对象
                gameOver();
                repaint();
            }
        }, interval, interval);
    }
 
    public void paint (Graphics g ){
        switch (state) {
            case GAME_OVER:
                Images.gameover.paintIcon(null,g,0,0);
                break;
            case RUNNING:
            Images.sea.paintIcon(null, g, 0, 0);
            ship.paintImage(g);
            for (int i = 0; i < submarines.length; i++) {
                submarines[i].paintImage(g);
            }
            for (int i = 0; i < mines.length; i++) {
                mines[i].paintImage(g);
            }
            for (int i = 0; i < bombs.length; i++) {
                bombs[i].paintImage(g);
            }
            g.drawString("SCORE" + score, 200, 50);
            g.drawString("LIFE" + ship.getLife(), 400, 50);
        }
    }
 
 
 
 
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        World world = new World();
        world.setFocusable(true);
        frame.add(world);
        frame.setResizable(false);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(WIDTH, HEIGHT+19);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
        world.action();
    }
}

Define a SeaObject class as a super class (parent class), and then write other derived classes (subclasses)

package cn.tedu.sunarine;
 
import javax.swing.ImageIcon;
import java.awt.Graphics;
import java.util.Random;
 
public abstract class SeaObject {
 
    public static final int LIVE = 0;
    public static final int DEAD = 1;
    protected int state=LIVE;
 
    protected int width;
    protected int height;
    protected int x;
    protected int y;
    protected int speed;
 
    //三个潜艇
    public SeaObject(int width, int height) {
        this.width = width;
        this.height = height;
        x =-width;
        Random rand = new Random();
        y = rand.nextInt(497 - height - 150 + 1) + 150;
        speed = rand.nextInt(3) + 1;
    }
//水雷，战舰，炸弹
    public SeaObject(int width, int height, int x, int y, int speed) {
        this.width = width;
        this.height = height;
        this.x = x;
        this.y = y;
        this.speed = speed;
    }
 
    public abstract void move();
 
    public abstract ImageIcon getImage();
 
    public boolean isLIVE(){
        return state ==LIVE;
    }
    public void paintImage(Graphics g){
        if (isLIVE()){
            this.getImage().paintIcon(null,g,this.x,this.y);
        }
    }
    public boolean isOutOfBounds(){
        return x>=World.WIDTH;
    }
    public boolean isHit(SeaObject other){
        int x1 = this.x-other.width;
        int x2 = this.x+this.width;
        int y1 = this.y-other.height;
        int y2 = this.y+this.height;
        int x=other.x;
        int y=other.y;
        return x>=x1 && x<=x2 && y>=y1 && y<=y2;
    }
 
    public void goDead(){
        state =DEAD;
    }
}

In Reference superclass of derived class

torpedo submarine class

package cn.tedu.sunarine;
import javax.swing.ImageIcon；
 
//鱼雷潜艇
public class TorpedoSubmarine extends SeaObject implements EnemyScore{
    TorpedoSubmarine(){
        super(64,20);
    }
 
    @Override
    public void move() {
        x+=speed;
    }
    public ImageIcon getImage(){
        return Images.torpedo;
    }
    public boolean isOutOfBounds() {
        return x>=World.WIDTH;
    }
    public int getScore(){
        return 20;
    }
}

mine submarine class

package cn.tedu.sunarine;
import javax.swing.ImageIcon;
 
//水雷潜艇
public class MineSubmarine extends SeaObject implements EnemyScore{
    MineSubmarine(){
       super(63,19);
    }
 
    @Override
    public void move() {
        x+=speed;
    }
    public ImageIcon getImage(){
        return Images.minesubm;
    }
    public Mine shootMine(){
        int x = this.x+(this.width/2);
        int y =this.y;
        return new Mine(x,y);
    }
    public boolean isOutOfBounds() {
        return x>=World.WIDTH;
    }
    public int getLife(){
        return 1;
    }
}

reconnaissance submarine class

package cn.tedu.sunarine;
import javax.swing.ImageIcon;
 
//侦察潜艇
public class ObserveSubmarine extends SeaObject implements EnemyScore{
    ObserveSubmarine(){
        super(63,19);
    }
 
    @Override
    public void move() {
        x+=speed;
    }
    public ImageIcon getImage(){
        return Images.observesubm;
    }
    public boolean isOutOfBounds() {
        return x>=World.WIDTH;
    }
    public int getScore(){
        return 10;
    }
}

torpedo class

package cn.tedu.sunarine;
//鱼雷
import javax.swing.ImageIcon;
public class Mine extends SeaObject{
        Mine(int x,int y){
            super(11,11,x,y,1);
        }
 
    @Override
    public void move() {
        y-=speed;
    }
 
    public ImageIcon getImage(){
            return Images.mine;
    }
    public boolean isOutOfBounds(){
            return y<=150-(height/2);
    }
}

Depth bomb class

package cn.tedu.sunarine;
//深水炸弹
import javax.swing.ImageIcon;
public class Bomb extends SeaObject{
    Bomb(int x,int y){
        super(9,12,x,y,3);
    }
 
    @Override
    public void move() {
        y+=speed;
    }
    public ImageIcon getImage(){
        return Images.bomb;
    }
    public boolean isOutOfBounds(){
        return y>=World.HEIGHT;
    }
}

Battleship class

package cn.tedu.sunarine;
 
import javax.swing.*;
 
//战舰
public class Battleship extends SeaObject{
    int life;
    Battleship(){
       super(66,26,270,124,20);
       life=1;
    }
 
    @Override
    public void move() {
        System.out.println("战舰移动");
    }
    public ImageIcon getImage(){
        return Images.battleship;
    }
    public Bomb shoot(){
        return new Bomb(this.x,this.y+height);
    }
    //限制移动范围
    public void moveLeft(){
        x-=speed;
        x=Math.max(0,x);
    }
    public void moveRight(){
        x+=speed;
        x=Math.min(x,World.WIDTH-this.width);
    }
    public void addLife(int num){
        life+=num;
    }
    public int getLife(){
        return life;
    }
    public void subtratLife(){
        life--;
    }
}

Added life interface

package cn.tedu.sunarine;
 
public interface EnemyLife {
    public int getLife();
}

Added point interface

package cn.tedu.sunarine;
 
public interface EnemyScore {
    public int getScore();
}

Finally, the Image class (can be based on your own picture Change)

package cn.tedu.sunarine;
import javax.swing.*;
public class Images {
    public static ImageIcon battleship;
    public static ImageIcon observesubm;
    public static ImageIcon mine;
    public static ImageIcon bomb;
    public static ImageIcon sea;
    public static ImageIcon torpedo;
    public static ImageIcon minesubm;
    public static ImageIcon gameover;
    static {
        battleship = new ImageIcon("./img/battleship.png");
        bomb = new ImageIcon("./img/bomb.png");
        gameover = new ImageIcon("./img/gameover.png");
        mine = new ImageIcon("./img/mine.png");
        minesubm = new ImageIcon("./img/minesubm.png");
        observesubm = new ImageIcon("./img/obsersubm.png");
        sea = new ImageIcon("./img/sea.png");
        torpedo = new ImageIcon("./img/torpesubm.png");
    }
 
    public static void main(String[] args) {
        System.out.println(battleship.getImageLoadStatus());
        System.out.println(observesubm.getImageLoadStatus());
        System.out.println(mine.getImageLoadStatus());
        System.out.println(battleship.getImageLoadStatus());
        System.out.println(bomb.getImageLoadStatus());
        System.out.println(gameover.getImageLoadStatus());
        System.out.println(minesubm.getImageLoadStatus());
        System.out.println(sea.getImageLoadStatus());
    }
}

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