我这么写它说不认识addWindowListener方法import java.awt.*; import java.awt.event.*;public class TGT extends Frame { public static void main(String[] args) { TGT t=new TGT(); }
public TGT() { WA wa=new WA(); addWindowListner(wa); setBounds(100,100,400,400); setVisible(true); } } class WA extends WindowAdapter { public void windowclosing(WindowEvent we) { System.exit(0); } }
我改了一下,编译通过了,但是有3个问题: 1.为什么上面的程序不行,下面编译就通过? 2.下面这个程序运行后,按X是没有反映的,为什么? 3.应该怎么改?import java.awt.*; import java.awt.event.*;public class TGT extends Frame { public static void main(String[] args) { TGT t=new TGT(); WA wa=new WA(); t.addWindowListener(wa); }
public TGT() { setBounds(100,100,400,400); setVisible(true); } } class WA extends WindowAdapter { public void windowclosing(WindowEvent we) { System.exit(1); } }
import java.awt.*; import java.awt.event.*;class Test extends Frame { public Test() { addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e) { dispose(); System.exit(0); } }); } public static void main(String args[]) { System.out.println("Starting Test..."); Test mainFrame = new Test(); mainFrame.setSize(400, 400); mainFrame.setTitle("Test"); mainFrame.setVisible(true); } }应该在构建器里面或者窗体显示出来之前,给他制定监视器。
import java.awt.event.*;public class TGT extends Frame
{
public static void main(String[] args)
{
TGT t=new TGT();
}
public TGT()
{
WA wa=new WA();
addWindowListner(wa); setBounds(100,100,400,400);
setVisible(true);
}
}
class WA extends WindowAdapter
{
public void windowclosing(WindowEvent we)
{
System.exit(0);
}
}
1.为什么上面的程序不行,下面编译就通过?
2.下面这个程序运行后,按X是没有反映的,为什么?
3.应该怎么改?import java.awt.*;
import java.awt.event.*;public class TGT extends Frame
{
public static void main(String[] args)
{
TGT t=new TGT();
WA wa=new WA();
t.addWindowListener(wa);
}
public TGT()
{
setBounds(100,100,400,400);
setVisible(true);
}
}
class WA extends WindowAdapter
{
public void windowclosing(WindowEvent we)
{
System.exit(1);
}
}
import java.awt.event.*;class Test extends Frame
{
public Test()
{
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{
dispose();
System.exit(0);
}
});
} public static void main(String args[]) {
System.out.println("Starting Test...");
Test mainFrame = new Test();
mainFrame.setSize(400, 400);
mainFrame.setTitle("Test");
mainFrame.setVisible(true);
}
}应该在构建器里面或者窗体显示出来之前,给他制定监视器。
我打错了,public void windowClosing(WindowEvent we)
可以了
import java.awt.*;
import java.awt.event.*;public class TGT extends Frame
{
public static void main(String[] args)
{
TGT t=new TGT(); }
public TGT()
{
WA wa=new WA();
addWindowListener(wa);
setBounds(100,100,400,400);
setVisible(true);
}
}
class WA extends WindowAdapter
{
public void windowclosing(WindowEvent we)
{
dispose(); //这个地方应该怎么写,才通过?
System.exit(0);
}
}
frame对Adapter必须是可见的,那不用内部类怎么实现呢?内部类有很多好处,可以让你写出简洁的代码
在AWT里面处处可见内部类的例子。
为什么不用内部类呢?
再问问:exit(0)和exit(1)有什么区别啊?