import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
public class JModify{
public static void main(String args[]){
ButtonFrame b1=new ButtonFrame("JAVA二级考试");
}
}
class ButtonFrame extends Frame implements ActionListener{
Button button1;
Button button2; ButtonFrame(String s){
super(s);
setBackground(Color.blue);
setSize(200,100);
setLayout(new FlowLayout());
button1=new Button("确定");
add(button1);
button1.addActionListener(this);
button2=new Button("取消");
add(button2);
button2.addActionListener(this);
setVisible(true);
}
public void actionPerformed(ActionEvent event){
if(event.getActionCommand().equals("确定"))
System.out.println("确定");
else if(event.getActionCommand().equals("取消"))
System.out.println("取消");
else
System.out.println("重试");
}}
这是原先的程序,我想加 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 使它可以关闭
import javax.swing.*;
import java.awt.*;
public class JModify{
public static void main(String args[]){
ButtonFrame b1=new ButtonFrame("JAVA二级考试");
}
}
class ButtonFrame extends Frame implements ActionListener{
Button button1;
Button button2; ButtonFrame(String s){
super(s);
setBackground(Color.blue);
setSize(200,100);
setLayout(new FlowLayout());
button1=new Button("确定");
add(button1);
button1.addActionListener(this);
button2=new Button("取消");
add(button2);
button2.addActionListener(this);
setVisible(true);
}
public void actionPerformed(ActionEvent event){
if(event.getActionCommand().equals("确定"))
System.out.println("确定");
else if(event.getActionCommand().equals("取消"))
System.out.println("取消");
else
System.out.println("重试");
}}
这是原先的程序,我想加 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 使它可以关闭
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);这句写在ButtonFrame构造函数里
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;然后将文件保存为JModify.java。
import javax.swing.*;
import java.awt.*;
public class ButtonFrame extends Frame implements ActionListener{
Button button1;
Button button2; ButtonFrame(String s){
super(s);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBackground(Color.blue);
setSize(200,100);
setLayout(new FlowLayout());
button1=new Button("确定");
add(button1);
button1.addActionListener(this);
button2=new Button("取消");
add(button2);
button2.addActionListener(this);
setVisible(true);
}
public void actionPerformed(ActionEvent event){
if(event.getActionCommand().equals("确定"))
System.out.println("确定");
else if(event.getActionCommand().equals("取消"))
System.out.println("取消");
else
System.out.println("重试");
}
public static void main(String args[]){
ButtonFrame b1=new ButtonFrame("JAVA二级考试");
}} ButtonFrame.java:10: cannot resolve symbol
symbol : method setDefaultCloseOperation (int)
location: class ButtonFrame
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
^
1 error
import javax.swing.*;
import java.awt.*;
public class ButtonFrame extends JFrame implements ActionListener{
Button button1;
Button button2; ButtonFrame(String s){
super(s);
setBackground(Color.blue);
setSize(200,100);
setLayout(new FlowLayout());
button1=new Button("确定");
add(button1);
button1.addActionListener(this);
button2=new Button("取消");
add(button2);
button2.addActionListener(this);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public void actionPerformed(ActionEvent event){
if(event.getActionCommand().equals("确定"))
System.out.println("确定");
else if(event.getActionCommand().equals("取消"))
System.out.println("取消");
else
System.out.println("重试");
}
public static void main(String args[]){
ButtonFrame b1=new ButtonFrame("JAVA二级考试");
}} 编译能过,却不能运行
Exception in thread "main" java.lang.Error: Do not use ButtonFrame.setLayout() u
se ButtonFrame.getContentPane().setLayout() instead
at javax.swing.JFrame.createRootPaneException(JFrame.java:465)
at javax.swing.JFrame.setLayout(JFrame.java:531)
at ButtonFrame.<init>(ButtonFrame.java:12)
at ButtonFrame.main(ButtonFrame.java:31)
用ButtonFrame.getContentPane().setLayout()
来替代你代码中ButtonFramesetLayout()---ButtonFrame()构造函数中第五行
同样用getContentPane().add()替代你的add()---ButtonFrame()构造函数中第九行
我试了以后通过:-)
java 版的猩猩都冬眠去了吗? 就一些三角猫在这里胡说八道 ;(