* 创建图形化界面
* 1.创建frame窗体
* 2.对窗体进行基本设置
* 比如大小、位置、布局
* 3.定义组件
* 4.将组件通过窗体的add方法添加到窗体
* 5.让窗体显示,通过setVisible(true)
import java.awt.*; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; public class AwtDemo { public static void main(String[] args){ Frame f=new Frame("我的窗口");//它默认的是边界布局 f.setLocation(300, 300);//定点距左边的距离 f.setSize(500, 400); f.setLayout(new FlowLayout()); Button b=new Button("按钮"); f.add(b); //f.addWindowListener(new MyWin()); //我们也可以写一个匿名内部类 f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e){ System.out.println("关闭窗体"); System.exit(0); } public void windowActivated(WindowEvent e){ System.out.println("我要活动了"); } public void windowOpened(WindowEvent e){ System.out.println("我被打开了"); } }); f.setVisible(true); } } /* interface Lis{ void close(); } abstract class WinLis implements Lis{ // 复写接口中的方法,要用 // 某一个接口,必须复写 // 其中所有的方法,才能 // 建立对象,然后传递给函数, // 用到abstract是因为这个里 // 面没有内容,如果调用的话 // 没有什么意义,所以抽象化了, // 不让创建对象 public void close(){ } } class MyWin implements WindowListener{ //复写7个方法,可是只用了其中一种方法 //其他动作都没有用到,可是却必须复与。 @Override public void windowOpened(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowClosing(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowClosed(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowIconified(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowDeiconified(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowActivated(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowDeactivated(WindowEvent e) { // TODO Auto-generated method stub } // } */ //因为WindowListener的子类WindowAdapter已结实现了WindowListener接口 //并已经覆盖了其中所有的方法,那么我只要继承自Windowadapter覆盖需要的方法即可 //在图形化界面有两个包必须导入,java.awt.*;还有一个是java.awt.event.*; class MyWin extends WindowAdapter{ public void windowClosing(WindowEvent e){ System.out.println("关闭窗体"); System.exit(0); } }
图形界面之鼠标键盘点击事件:
import java.awt.Button; import java.awt.FlowLayout; import java.awt.Frame; 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; public class MouseAndKeyEvent { private Frame f; private Button but; private TextField tf; MouseAndKeyEvent(){ init(); } public void init(){ f=new Frame("我的窗口"); f.setBounds(300,100,600,500); but=new Button("按钮"); tf=new TextField(10);//表示长度为10 f.add(tf); f.add(but); myEvent(); f.setLayout(new FlowLayout()); f.setVisible(true); } public void myEvent(){ f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e){ System.exit(0); } }); //在文本框里只能输入数字 tf.addKeyListener(new KeyAdapter() { public void keyPressed(KeyEvent e){ int code=e.getKeyCode(); if(!(code>=KeyEvent.VK_0&&code<=KeyEvent.VK_9)) System.out.println(code+"..是不合法的数字"); e.consume();//使用此事件,以便不会按照默认的方式由产生此事件的源代码来处理此事件 } }); //but添加一个键盘监听 but.addKeyListener(new KeyAdapter(){ public void keyPressed(KeyEvent e){ if(e.getKeyCode()==KeyEvent.VK_ENTER) System.exit(0); System.out.println(KeyEvent.getKeyText(e.getKeyCode())+"..."+e.getKeyCode()); //键盘的组合键 if(e.isControlDown()&&e.getKeyCode()==KeyEvent.VK_ENTER) System.out.println("Ctrl+Enter is run"); } }); but.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { System.out.println("action ok"); } }); but.addMouseListener(new MouseAdapter() { private int count=1; private int clickCount=1; public void mouseEntered(MouseEvent e){ System.out.println("鼠标进入到该组件"+count++); } public void mouseClicked(MouseEvent e){ System.out.println("点击动作"+clickCount++); } public void mouseClicked2(MouseEvent e){ if(e.getClickCount()==2) System.out.println("双击动作"+clickCount++); } }); } public static void main(String []args){ new MouseAndKeyEvent(); } }
图形界面之列出指定目录内容:
import java.awt.Button; import java.awt.Dialog; 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.WindowAdapter; import java.awt.event.WindowEvent; import java.io.File; public class MyWindowDemo { private Frame f; private TextField tf; private Button but; private Button okBut; private TextArea ta; private Dialog d; private Label lab;//把文字封装成label对象添加进去。 MyWindowDemo(){ init(); } public void init(){ f=new Frame("我的窗口"); f.setBounds(300,100,600,500); f.setLayout(new FlowLayout()); tf=new TextField(60); but=new Button("转到"); d=new Dialog(f,"提示信息-self",true);//d本身是一个窗体,不能加到Frame中。 d.setBounds(400,200,240,150); d.setLayout(new FlowLayout()); lab=new Label(); okBut=new Button("确定"); d.add(lab); d.add(okBut); ta=new TextArea(25, 70); f.add(tf); f.add(but); f.add(ta); myEvent(); f.setVisible(true); } public void myEvent(){ okBut.addActionListener(new ActionListener(){ @Override public void actionPerformed(ActionEvent e) { d.setVisible(false); } }); d.addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e ){ d.setVisible(false); } }); //通过键盘对事件进行操作。 tf.addKeyListener(new KeyAdapter() { public void keyPressed(KeyEvent e){ if(e.getKeyCode()==KeyEvent.VK_ENTER) showDir(); } }); but.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ showDir(); //tf.setText("");//清除textField的内容 } }); f.addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e ){ System.exit(0); } }); } private void showDir(){ String dirPath=tf.getText(); //ta.setText(text);//把获取到文本放到TextArea //System.out.println(text); File dir=new File(dirPath); if(dir.exists()&&dir.isDirectory()){ ta.setText("");//把之前路径找到的文件清除 String[] names=dir.list(); for(String name:names){ //对于有很多文件的话,我们可以把它们存到String Builder中 //append,表示将给定文本追加到文本区的当前文本。 ta.append(name+"\n\r");//用到换行等 } } else{ String info="你输入的信息:"+dirPath+"是错误的,请重输"; lab.setText(info); d.setVisible(true); } } public static void main(String [] args){ new MyWindowDemo(); } }