JAVA

javaGUI

　　javaGUI….笔记
　　了解即可。。。

布局

  • 流式布局 FlowLayout 从上到下，从左到右
  • 边界布局 东西南北中
  • 网格布局 网格
  • 网格包布局 大小不确定，但是每一个组件的边界都在网格上
  • 卡片布局 点A出A的页面，点B出B的页面。。。

流式布局

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Frame f=new Frame("hello world");
f.setLayout(new FlowLayout());//给窗体添加流式布局

增加监听器

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import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

public class FrameDemo {
	public static void main(String[] args) {
		Frame f=new Frame("hello world.");
		f.setLayout(new FlowLayout());
		f.setBounds(400, 200, 400, 300);
		
		TextField tf=new TextField(20);
		Button bu=new Button("数据转移");
		bu.setSize(20,10);
		TextArea ta=new TextArea(10,40);
		
		f.add(tf);
		f.add(bu);
		f.add(ta);
		
		f.addWindowListener(new WindowAdapter() {
			@Override
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		
		bu.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				String tf_str=tf.getText();
				tf.setText("");
				ta.append(tf_str+"\r\n");
				//获取光标
				tf.requestFocus();
			}
		});
		
		f.setVisible(true);	
	}
}

给按钮添加鼠标点击 & 进入 & 离开事件

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package cn.yifei_02;

import java.awt.Button;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

public class FrameDemo2 {
	public static void main(String[] args) {
		Frame f=new Frame("hello world.");
		f.setLayout(new FlowLayout());
		f.setBounds(400, 200, 400, 300);
		
		Button redButton=new Button("红色");
		
		f.add(redButton);
		
		//设置窗体关闭
		f.addWindowListener(new WindowAdapter() {
			@Override
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		
		//对按钮添加动作事件
		// redButton.addActionListener(new ActionListener() {
		// @Override
		// public void actionPerformed(ActionEvent e) {
		// f.setBackground(Color.RED);
		// }
		// });
		
		//添加鼠标点击事件
		redButton.addMouseListener(new MouseAdapter() {
			@Override
			public void mouseClicked(MouseEvent e) {
				f.setBackground(Color.red);
			}
		});
		
		//添加鼠标进入事件
			redButton.addMouseListener(new MouseAdapter() {
				@Override
				public void mouseEntered(MouseEvent e) {
					f.setBackground(Color.red);
				}
				
				@Override
				public void mouseExited(MouseEvent e) {
					f.setBackground(Color.white);
				}
			});

		f.setVisible(true);	
	}
}

键盘监听事件

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import java.awt.Button;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Label;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

public class FrameDemo3 {
	public static void main(String[] args) {
		Frame f=new Frame("hello world.");
		f.setLayout(new FlowLayout());
		f.setBounds(400, 200, 400, 300);
		
		Label label=new Label("只能输入数字啊！");
		TextField textField=new TextField(40);
		
		
		
		f.add(label);
		f.add(textField);
		
		//键盘监听事件
		textField.addKeyListener(new KeyAdapter() {
			@Override
			public void keyPressed(KeyEvent e) {
				char ch=e.getKeyChar();
				if(!(ch>='0' && ch<='9')){
					e.consume();//使此事件不发生
				}
			}
		});
		
		//设置窗体关闭
		f.addWindowListener(new WindowAdapter() {
			@Override
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		f.setVisible(true);	
	}
}

多级菜单

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import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.IOException;

public class FrameDemo4 {
	public static void main(String[] args) {
		Frame f = new Frame("多级菜单");
		f.setLayout(new FlowLayout());
		f.setBounds(400, 200, 400, 300);
		String name = f.getTitle();
		// 菜单栏
		MenuBar mb = new MenuBar();
		// 菜单
		Menu m1 = new Menu("文件");
		Menu m2 = new Menu("更改名称");
		// 菜单项
		MenuItem mi1 = new MenuItem("好好学习");
		MenuItem mi2 = new MenuItem("天天向上");
		MenuItem mi3 = new MenuItem("恢复标题");
		MenuItem mi4 = new MenuItem("打开记事本");
		MenuItem mi = new MenuItem("退出系统");

		m2.add(mi1);
		m2.add(mi2);
		m2.add(mi3);
		m1.add(m2);
		m1.add(mi4);
		m1.add(mi);
		mb.add(m1);

		f.setMenuBar(mb);

		mi4.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				Runtime r = Runtime.getRuntime();
				try {
					r.exec("notepad");
				} catch (IOException e1) {
					e1.printStackTrace();
				}
			}
		});

		mi1.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				f.setTitle(mi1.getLabel());
			}
		});

		mi2.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				f.setTitle(mi2.getLabel());
			}
		});

		mi3.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				f.setTitle(name);
			}
		});

		mi.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				System.exit(0);
			}
		});

		// 设置窗体关闭
		f.addWindowListener(new WindowAdapter() {
			@Override
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		f.setVisible(true);
	}
}

工具包

public class UiUtil{
    private UiUtil(){}
    //修改窗体的图标
    public static void setFrameImage(JFrame jf){
        //获取工具类对象
        Toolkit tk=Toolkit.getDefaultToolkit();
        //根据路径获取图片
        Image i=tk.getImage("src\\cn\\yifei\\1.jpg");
        //给窗体设置图片
        jf.setIconImage(i);
    }
    //设置窗体居中
    public static void setFrameCenter(JFrame jf){
        Toolkit tk=Toolkit.getDefaultToolkit();
        //获取屏幕宽高
        Dimension d=tk.getScreenSize();
        double srceenWidth=d.getWidth();
        double srceenHeight=d.getHeight();
        //获取窗体宽高
        int frameWidth=jf.getWidth();
        int frameHeght=jf.getHeight();
        //获取新的宽高
        int width=(srceenWidth-frameWidth)/2;
        int height=(srceenHeight-frameHeght)/2;
        //设置窗体坐标
        jf.setLocation(width,height);
    }
}

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转载请注明出处：http://taowusheng.cn/
微博：寒枫–0-0–
知乎：https://www.zhihu.com/people/tao-wu-sheng
豆瓣：YIFEI