学步园

//TestDialog.java</p> <p>package myprojects.testdialog;</p> <p>import java.awt.*;<br /> import java.awt.event.*;</p> <p>class TestDialog extends Frame {<br /> private TextField tf=new TextField(10);<br /> public TestDialog() {<br /> addWindowListener(new WindowAdapter() {<br /> public void windowClosing(WindowEvent e) {<br /> dispose();<br /> System.exit(0);<br /> }<br /> });</p> <p> Button b1=new Button("打开模态对话框");<br /> Button b2=new Button("打开非模态对话框");<br /> this.add(tf,"North");<br /> this.add(b1,"Center");<br /> this.add(b2,"East");<br /> //add.(tf,"North");<br /> //add.(b1,"Center");<br /> //add.(b2,"East");</p> <p> b1.addActionListener(new ActionListener(){<br /> public void actionPerformed(ActionEvent e){ //经常出现的错误，把参数ActionEvent e 写成 ActionListener e<br /> MyDialog dlg=new MyDialog(TestDialog.this,"modal Dialog",true); //注意这里的TestDialog.this<br /> dlg.setInfo(tf.getText());<br /> dlg.setVisible(true);//模态对话框未被关闭前，主程序是不会往下执行的<br /> //------------------------------<br /> tf.setText(dlg.getInfo());<br /> }<br /> });<br /> b2.addActionListener(new ActionListener(){<br /> public void actionPerformed(ActionEvent e){<br /> MyDialog dlg=new MyDialog(TestDialog.this,"modal Dialog",false); //注意这里的TestDialog.this<br /> dlg.setInfo(tf.getText());<br /> dlg.setVisible(true);//</p> <p> //tf.setText(dlg.setInfo());<br /> }<br /> });<br /> }<br /> public void setInfo(String strInfo){<br /> tf.setText(strInfo);<br /> }</p> <p> public static void main(String args[]) {<br /> System.out.println("Starting TestDialog...");<br /> TestDialog mainFrame = new TestDialog();<br /> mainFrame.setSize(400, 400);<br /> mainFrame.setTitle("TestDialog");<br /> mainFrame.setVisible(true);<br /> }<br /> }<br />

//MyDialog.java</p> <p>package myprojects.testdialog;</p> <p>import java.awt.Dialog;<br /> import java.awt.*;<br /> import java.awt.event.*;</p> <p>public class MyDialog extends Dialog {<br /> private TextField tf=new TextField(10);<br /> private String strInfo=null;<br /> public MyDialog(Frame owner,String title,boolean modal){<br /> super(owner,title,modal);<br /> setBounds(0,0,200,150);</p> <p> Button b1=new Button("应用");<br /> Button b2=new Button("确定");</p> <p> add(tf,"North");<br /> add(b1,"Center");<br /> add(b2,"East");</p> <p> if(this.isModal()==true){<br /> b1.setEnabled(false);<br /> }</p> <p> b1.addActionListener(new ActionListener(){<br /> public void actionPerformed(ActionEvent e){<br /> ((TestDialog)MyDialog.this.getOwner()).setInfo(tf.getText()); //注意MyDialog.this.getOwner()可以省略MyDialog.this.,程序在运行过程中如果在当前内部类对象中找不到该方法，会自动添加MyDialog.this.前缀去查找！<br /> }<br /> });<br /> b2.addActionListener(new ActionListener(){<br /> public void actionPerformed(ActionEvent e){<br /> if(isModal()==true){<br /> strInfo=new String(tf.getText());<br /> }<br /> else{<br /> ((TestDialog)getOwner()).setInfo(tf.getText()); //注意这里getOwner()前面省略了MyDialog.this.<br /> }<br /> dispose();<br /> }<br /> });</p> <p> }<br /> public String getInfo(){<br /> return strInfo;<br /> }<br /> public void setInfo(String strInfo){<br /> tf.setText(strInfo);<br /> }<br /> }<br />