给段最简单的java代码 让我新手看一下

最简单的java代码肯定就是这个了，如下：

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public class MyFirstApp

{

public static void main(String[] args)

{

System.out.print("Hello world");

}

}

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Java写一套漂亮的代码，哪些设计模式比较常用

对于代码结构上，看起来漂亮起作用的模式，常用的策略模式，工厂模式，装饰模式和观察者模式吧。但也看情景，生搬硬套会显得不够简洁的。

求java代码怎么做一个好看的贪吃蛇

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.util.*;

public class GreedSnake implements KeyListener{

JFrame mainFrame;

Canvas paintCanvas;

JLabel labelScore;

SnakeModel snakeModel = null;

public static final int canvasWidth = 200;

public static final int canvasHeight = 300;

public static final int nodeWidth = 10;

public static final int nodeHeight = 10;

public GreedSnake() {

mainFrame = new JFrame("GreedSnake");

Container cp = mainFrame.getContentPane();

labelScore = new JLabel("Score:");

cp.add(labelScore, BorderLayout.NORTH);

paintCanvas = new Canvas();

paintCanvas.setSize(canvasWidth+1,canvasHeight+1);

paintCanvas.addKeyListener(this);

cp.add(paintCanvas, BorderLayout.CENTER);

JPanel panelButtom = new JPanel();

panelButtom.setLayout(new BorderLayout());

JLabel labelHelp;

labelHelp = new JLabel("PageUp, PageDown for speed;", JLabel.CENTER);

panelButtom.add(labelHelp, BorderLayout.NORTH);

labelHelp = new JLabel("ENTER or R or S for start;", JLabel.CENTER);

panelButtom.add(labelHelp, BorderLayout.CENTER);

labelHelp = new JLabel("SPACE or P for pause",JLabel.CENTER);

panelButtom.add(labelHelp, BorderLayout.SOUTH);

cp.add(panelButtom,BorderLayout.SOUTH);

mainFrame.addKeyListener(this);

mainFrame.pack();

mainFrame.setResizable(false);

mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

mainFrame.setVisible(true);

begin();

}

public void keyPressed(KeyEvent e){

int keyCode = e.getKeyCode();

if (snakeModel.running)

switch(keyCode){

case KeyEvent.VK_UP:

snakeModel.changeDirection(SnakeModel.UP);

break;

case KeyEvent.VK_DOWN:

snakeModel.changeDirection(SnakeModel.DOWN);

break;

case KeyEvent.VK_LEFT:

snakeModel.changeDirection(SnakeModel.LEFT);

break;

case KeyEvent.VK_RIGHT:

snakeModel.changeDirection(SnakeModel.RIGHT);

break;

case KeyEvent.VK_ADD:

case KeyEvent.VK_PAGE_UP:

snakeModel.speedUp();

break;

case KeyEvent.VK_SUBTRACT:

case KeyEvent.VK_PAGE_DOWN:

snakeModel.speedDown();

break;

case KeyEvent.VK_SPACE:

case KeyEvent.VK_P:

snakeModel.changePauseState();

break;

default:

}

if (keyCode == KeyEvent.VK_R ||

keyCode == KeyEvent.VK_S ||

keyCode == KeyEvent.VK_ENTER){

snakeModel.running = false;

begin();

}

}

public void keyReleased(KeyEvent e){

}

public void keyTyped(KeyEvent e){

}

void repaint(){

Graphics g = paintCanvas.getGraphics();

//draw background

g.setColor(Color.WHITE);

g.fillRect(0,0,canvasWidth,canvasHeight);

// draw the snake

g.setColor(Color.BLACK);

LinkedList na = snakeModel.nodeArray;

Iterator it = na.iterator();

while(it.hasNext()){

Node n = (Node)it.next();

drawNode(g,n);

}

// draw the food

g.setColor(Color.RED);

Node n = snakeModel.food;

drawNode(g,n);

updateScore();

}

private void drawNode(Graphics g, Node n){

g.fillRect(n.x*nodeWidth,

n.y*nodeHeight,

nodeWidth-1,

nodeHeight-1);

}

public void updateScore(){

String s = "Score: " + snakeModel.score;

labelScore.setText(s);

}

void begin(){

if (snakeModel == null || !snakeModel.running){

snakeModel = new SnakeModel(this,

canvasWidth/nodeWidth,

canvasHeight/nodeHeight);

(new Thread(snakeModel)).start();

}

}

public static void main(String[] args){

GreedSnake gs = new GreedSnake();

}

}

///////////////////////////////////////////////////

// 文件2

///////////////////////////////////////////////////

import java.util.*;

import javax.swing.*;

class SnakeModel implements Runnable{

GreedSnake gs;

boolean[][] matrix;

LinkedList nodeArray = new LinkedList();

Node food;

int maxX;

int maxY;

int direction = 2;

boolean running = false;

int timeInterval = 200;

double speedChangeRate = 0.75;

boolean paused = false;

int score = 0;

int countMove = 0;

// UP and DOWN should be even

// RIGHT and LEFT should be odd

public static final int UP = 2;

public static final int DOWN = 4;

public static final int LEFT = 1;

public static final int RIGHT = 3;

public SnakeModel(GreedSnake gs, int maxX, int maxY){

this.gs = gs;

this.maxX = maxX;

this.maxY = maxY;

// initial matirx

matrix = new boolean[maxX][];

for(int i=0; imaxX; ++i){

matrix = new boolean[maxY];

Arrays.fill(matrix,false);

}

// initial the snake

int initArrayLength = maxX 20 ? 10 : maxX/2;

for(int i = 0; i initArrayLength; ++i){

int x = maxX/2+i;

int y = maxY/2;

nodeArray.addLast(new Node(x, y));

matrix[x][y] = true;

}

food = createFood();

matrix[food.x][food.y] = true;

}

public void changeDirection(int newDirection){

if (direction % 2 != newDirection % 2){

direction = newDirection;

}

}

public boolean moveOn(){

Node n = (Node)nodeArray.getFirst();

int x = n.x;

int y = n.y;

switch(direction){

case UP:

y--;

break;

case DOWN:

y++;

break;

case LEFT:

x--;

break;

case RIGHT:

x++;

break;

}

if ((0 = x x maxX) (0 = y y maxY)){

if (matrix[x][y]){

if(x == food.x y == food.y){

nodeArray.addFirst(food);

int scoreGet = (10000 - 200 * countMove) / timeInterval;

score += scoreGet 0? scoreGet : 10;

countMove = 0;

food = createFood();

matrix[food.x][food.y] = true;

return true;

}

else

return false;

}

else{

nodeArray.addFirst(new Node(x,y));

matrix[x][y] = true;

n = (Node)nodeArray.removeLast();

matrix[n.x][n.y] = false;

countMove++;

return true;

}

}