让java显示超过1 .add()

发布时间：2020-12-15 08:44:21 所属栏目：Java 来源：网络整理

导读：我已经开始学习基本的 Java了,并想重写我曾用 PHP编写的游戏地图生成器.我有一部分工作正常(这只是开始),但每当我想显示2件事(使用.add())时,它只会显示其中一个.继承我的代码; public static void main(String[] args) { JFrame m1 = new JFrame(); Contain

我已经开始学习基本的 Java了,并想重写我曾用 PHP编写的游戏地图生成器.我有一部分工作正常(这只是开始),但每当我想显示2件事(使用.add())时,它只会显示其中一个.继承我的代码;

public static void main(String[] args) {
    JFrame m1 = new JFrame();
    Container con = m1.getContentPane();
    Color c = new Color(16,174,0);
    con.setBackground(c);
    m1.setSize(mapWidth,mapHeight);
    m1.setTitle("ThomasMosey's Map Generator"); // Window Title
    m1.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
    m1.add(new User());
    m1.add(new Grid());
    m1.setVisible(true);
}

它只是代码的一部分,但我想知道是否有任何我做错了.add那里.

先感谢您.

这是完整的代码;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.JComponent;
import javax.swing.JFrame;

public class Map extends JFrame {
    public static int mapWidth = 576; // The Map's Width
    public static int mapHeight = 598; // The Map's Height
    public static int userX = 1;
    public static int userY = 1;
    private static final long serialVersionUID = 1L;
    public static void main(String[] args) {
        JFrame m1 = new JFrame();
        Container con = m1.getContentPane();
        Color c = new Color(16,0);
        con.setBackground(c);
        m1.setSize(mapWidth,mapHeight);
        m1.setTitle("ThomasMosey's Map Generator"); // Window Title
        m1.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
        con.add(new User(),BorderLayout.NORTH);
        con.add(new Grid(),BorderLayout.CENTER);
        m1.setVisible(true);
    }
}
// The Grid system
class Grid extends JComponent {
    private static final long serialVersionUID = 1L;
    public void paint(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
        Color gridColor = new Color(0,84,12);
        g2.setColor(gridColor);
        int i;
        int i2;
        for(i = 50; i <= Map.mapWidth; i += 51) {
            g2.drawLine(0,i,Map.mapWidth,i);
        }
        for(i2 = 50; i2 <= Map.mapHeight; i2 += 51) {
            g2.drawLine(i2,i2,Map.mapHeight);
        }
    }
}
// Drawing the Grid but lower down to give a significant difference to check whether or not it's actually drawing on the JFrame
class User extends JComponent {
    private static final long serialVersionUID = 1L;
    public void paint(Graphics g2) {
        Graphics2D g22 = (Graphics2D) g2;
        g22.setRenderingHint(RenderingHints.KEY_ANTIALIASING,12);
        g22.setColor(gridColor);
        int i22;
        for(i22 = 50; i22 <= 6000; i22 += 53) {
            g22.drawLine(0,i22,i22+1);
        }
    }
}

解决方法

>内容窗格的默认布局是BorderLayout.
>将组件添加到没有约束的边框布局中,它最终在CENTER中.
>边框布局的每个部分中只能出现一个组件.

所以试试这个……

m1.add(new User(),BorderLayout.NORTH);
m1.add(new Grid(),BorderLayout.CENTER);

部分问题是自定义组件的默认首选大小为0x0.试试这个变种.

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

public class Map extends JFrame {
    public static int mapWidth = 576; // The Map's Width
    public static int mapHeight = 598; // The Map's Height
    public static int userX = 1;
    public static int userY = 1;
    private static final long serialVersionUID = 1L;
    public static void main(String[] args) {
        JFrame m1 = new JFrame();
        Container con = m1.getContentPane();
        Color c = new Color(16,0);
        con.setBackground(c);
        // bad form - pack() instead
        //m1.setSize(mapWidth,mapHeight);
        m1.setTitle("ThomasMosey's Map Generator"); // Window Title
        m1.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
        User user = new User();
        user.setPreferredSize(new Dimension(300,300));
        con.add(user,BorderLayout.NORTH);
        Grid grid = new Grid();
        grid.setPreferredSize(new Dimension(600,600));
        con.add(grid,BorderLayout.CENTER);
        m1.pack();
        m1.setVisible(true);
    }
}
// The Grid system
class Grid extends JComponent {
    private static final long serialVersionUID = 1L;
    public void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,Map.mapHeight);
        }
    }
}
// Drawing the Grid but lower down to give a significant difference to check whether or not it's actually drawing on the JFrame
class User extends JComponent {
    private static final long serialVersionUID = 1L;
    public void paintComponent(Graphics g2) {
        Graphics2D g22 = (Graphics2D) g2;
        g22.setRenderingHint(RenderingHints.KEY_ANTIALIASING,i22+1);
        }
    }
}

（编辑：李大同）

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