javajpenal的简单介绍

博主：adminadmin 2022-11-27 04:50:06 54

本篇文章给大家谈谈javajpenal，以及对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。

本文目录一览：

java面板

代码确实不对，应该是你截出来的片段吧？

调程序要从现象找原因的，第二个图是异常吧？异常你也发现了，就是penal的y值没有从0开始，这就是异常的原因啊，然后去代码里面看，debug跟一下代码，看看初始化的时候y值为什么不是0，跟踪一下y值。调程序必须用Eclipse debug呀！

java问题，我用io流获取了一张图片，请问要如何在JPenal中显示呢？需要详细代码....

给你代码

import java.awt.Container;

import java.awt.Graphics;

import java.awt.Image;

import java.awt.Toolkit;

import javax.swing.JFrame;

import javax.swing.JPanel;

class DemoPanel extends JPanel {

 private Image im1 = Toolkit.getDefaultToolkit().getImage("e:/123.jpg");

 public void paintComponent(Graphics g) {

  g.drawImage(im1, 0, 0, null);

 }

}

public class DemoBackground extends JFrame {

 public DemoBackground() {

  Container con = this.getContentPane();

  DemoPanel my = new DemoPanel();

  this.setBounds(200, 100, 400, 300);

  con.add(my);

  this.setVisible(true);

  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 }

 public static void main(String[] args) {

  new DemoBackground();

 }

}

swing中如何清空penal容器中的组件

JPanel提供了一个removeAll()的方法，可以清空JPanel容器里面所有的组件。

如果对你有帮助，别忘了采纳哈?

java编程问题

我自己写了一个简单的程序，可选择落子的先后顺序，重新开始，最后判断某一方是否为五子连珠。选择落子的先后顺序，只需定义一个boolean变量，每次切换取其反值；重制棋盘或重新开始就把棋盘重新绘制一遍；判断某一方是否为五子连珠，就判断某方的每个棋子，以它为中心与之紧邻的水平，垂直，左斜，右斜四个方向是否有五子连珠。用一个二维数组position存储棋盘上的棋子情况，position[x][y]=1,0,-1分别表示棋盘的第x行第y列下有黑子，无子，白子。源代码如下：

package com.test;

import java.awt.*;

import java.util.*;

import java.awt.geom.*;

import java.awt.event.*;

import javax.swing.*;

public class MyFiveChess {

public static void main(String[] args) {

JFrame f = new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

int screenWidth = screenSize.width;

int screenHeight = screenSize.height;

f.setSize(screenWidth / 2, screenHeight / 2);

f.setLocation(screenWidth / 4, screenHeight / 4);

f.setTitle("FiveChess");

MyPanel panel = new MyPanel();

f.add(panel);

f.setVisible(true);

}

}

class MyPanel extends JPanel {

private static final int SIDELENGTH = 10;

private ArrayListEllipse2D squares = new ArrayListEllipse2D();;

private Ellipse2D current = null;

JButton jb = new JButton("重新开始");

JButton jb2 = new JButton("切换先手");

boolean isBlack;

boolean first = true;

boolean isOver;

int l = 16;

int n = 20;

int bx = 20;

int by = 20;

int[][] position = new int[n + 1][n + 1];

public MyPanel(){

jb.addActionListener(new MyActionHandler());

jb2.addActionListener(new MyActionHandler());

addMouseListener(new MouseHandler());

addMouseMotionListener(new MouseMotionHandler());

add(jb);

add(jb2);

}

public void initMyPenal(){

squares = new ArrayListEllipse2D();

current = null;

isBlack = first;

isOver = false;

position = new int[n + 1][n + 1];

for(int i = 0; i = n; i++)

for(int j = 0; j = n; j++)

position[i][j] = 0;

repaint();

}

public void paint(Graphics g) {

super.paint(g);

jb.setLocation(400,150);

jb2.setLocation(400,200);

g.setColor(Color.RED);

g.setFont(new Font(null, Font.BOLD, 20));

g.drawString((first ? "黑" : "白")+"方下子", 400, 100);

g.setColor(new Color(240, 210, 120));

g.fillRect(bx - l, by - l, l * (n + 2), l * (n + 2));

g.setColor(Color.BLACK);

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

g.drawLine(bx, by + i * l, bx + l * n, by + i * l);

g.drawLine(bx + i * l, by, bx + i * l, by + l * n);

}

Graphics2D g2 = (Graphics2D)g;

isBlack = first;

for(Ellipse2D r : squares){

g2.setColor(isBlack ? Color.BLACK : Color.WHITE);

g2.fill(r);

isBlack = !isBlack;

}

if(isOver) {

g.setColor(Color.RED);

g.setFont(new Font("TimesRoman", Font.BOLD, 60));

g.drawString((isBlack ? "白" : "黑") + "方获胜", 120, 200);

}

}

public Ellipse2D find(Point2D p){

for(Ellipse2D r : squares)

if(r.contains(p))

return r;

return null;

}

public void add(Point2D p) {

if(p.getX() bx - l / 2 p.getX() bx + l * n + l / 2

p.getY() by - l / 2 p.getY() by + l * n + l / 2){

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

for (int j = 0; j = n; j++) {

if(position[i][j] == 1 || position[i][j] == -1) continue;

current = new Ellipse2D.Double(bx + j * l - l / 2,

by + i * l - l / 2, l, l);

if (current.contains(p)) {

position[i][j] = isBlack ? 1 : -1;

isOver = isWin(position, isBlack, i , j) ? true : false;

current.setFrame(bx + j * l - l / 2 + 1,

by + i * l - l / 2 + 1, l - 2, l - 2);

squares.add(current);

repaint();

return;

}

}

}

}

}

private class MouseHandler extends MouseAdapter{

public void mousePressed(MouseEvent event){

if(isOver) return;

current = find(event.getPoint());

if(current == null)

add(event.getPoint());

}

}

private class MyActionHandler implements ActionListener{

public void actionPerformed(ActionEvent e) {

String cmd=e.getActionCommand();

if("重新开始".equals(cmd)){

initMyPenal();

}else if("切换先手".equals(cmd)){

initMyPenal();

first=!first;

}

}

}

private class MouseMotionHandler implements MouseMotionListener{

public void mouseMoved(MouseEvent event){

Rectangle r = new Rectangle(bx - l, by - l, l * (n + 2), l * (n + 2));

if(r.contains(event.getPoint())){

setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));

}else setCursor(Cursor.getDefaultCursor());

}

public void mouseDragged(MouseEvent event){}

}

public boolean isWin(int[][] state, boolean isBlack, int x, int y) {//四个方向中是否有五子连珠

return isCzWin(state, isBlack, x, y)

|| isSpWin(state, isBlack, x, y)

|| isYxWin(state, isBlack, x, y)

|| isZxWin(state, isBlack, x, y);

}

public boolean isCzWin(int[][] state, boolean isBlack, int x, int y) {//判断垂直方向是否有五子连珠

int n = 0;

int a = (x = 4 ? x - 4 : 0);

int b = (x = state.length - 5 ? x + 4 : state.length - 1);

for (int i = a; i = b; i++)

if (state[i][y] == (isBlack ? 1: -1)) {

if (++n == 5) return true;

} else n = 0;

return false;

}

public boolean isSpWin(int[][] state, boolean isBlack, int x, int y) {//判断水平方向是否有五子连珠

int n = 0;

int a = (y = 4 ? y - 4 : 0);

int b = (y = state[0].length - 5 ? y + 4 : state[0].length - 1);

for (int i = a; i = b; i++)

if (state[x][i] == (isBlack ? 1: -1)) {

if (++n == 5) return true;

} else n = 0;

return false;

}

public boolean isZxWin(int[][] state, boolean isBlack, int x, int y) {//判断左斜方向是否有五子连珠

int n = 1, a = x, b = y;

for (int i = 1; i = 4 a 0 b 0; i++)

if (state[a - 1][b - 1] == (isBlack ? 1: -1)) {

n++; a--; b--;

} else break;

for (int i = 1; i = 4 x state.length - 1 y state[0].length - 1; i++)

if (state[x + 1][y + 1] == (isBlack ? 1: -1)) {

n++; x++; y++;

} else break;

if (n = 5) return true;

return false;

}

public boolean isYxWin(int[][] state, boolean isBlack, int x, int y) {//判断右斜方向是否有五子连珠

int n = 1, a = x, b = y;

for (int i = 1; i = 4 a 0 b state[0].length - 1; i++)

if (state[a - 1][b + 1] == (isBlack ? 1: -1)) {

n++; a--; b++;

} else break;

for (int i = 1; i = 4 x state.length - 1 y 0; i++)

if (state[x + 1][y - 1] == (isBlack ? 1: -1)) {

n++; x++; y--;

} else break;

if (n = 5) return true;

return false;

}

}

不是很完善，希望对你有帮助。

java 新手关于显示图片的提问，我在main方法里写了新建penal，自己的penal如下，为什么不显示图片呢？

你没有JFrame

你的JPanel放哪呢对吧

先不说你这方法能不能出效果吧 但是你没有一个JFrame来承载JPanel 是没有什么效果的

实例一个JFrame 吧 JPanel加到JFrame再试试 说不定就好了

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发布于：2022-11-27，除非注明，否则均为首码项目网原创文章，转载请注明出处。

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