import java.awt.*;
import javax.swing.*;public class myTest
{
public static void main(String args[])
{
JFrame myMainFrame=new JFrame("主窗口");
myMainFrame.setSize(400,200);
myMainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Dimension screenSize=Toolkit.getDefaultToolkit().getScreenSize();
int screenWidth=screenSize.width;
int screenHeight=screenSize.height;
Dimension frameSize=myMainFrame.getSize();
int x=(screenWidth-frameSize.width)/2;
int y=(screenHeight-frameSize.height)/2;
myMainFrame.setLocation(x,y);
myMainFrame.setVisible(true);
JMenuBar myJmb=new JMenuBar();
myMainFrame.setJMenuBar(myJmb);//
JMenu fileMenu=new JMenu("文件");
JMenu editMenu=new JMenu("编辑");
myJmb.add(fileMenu);
myJmb.add(editMenu);
fileMenu.add(new JMenuItem("创建新文件"));
fileMenu.add(new JMenuItem("打开"));
fileMenu.add(new JMenuItem("保存"));
fileMenu.add(new JMenuItem("另存为"));
fileMenu.add(new JMenuItem("关闭推出"));
}
}为什么显示不出来 菜单????
import javax.swing.*;public class myTest
{
public static void main(String args[])
{
JFrame myMainFrame=new JFrame("主窗口");
myMainFrame.setSize(400,200);
myMainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Dimension screenSize=Toolkit.getDefaultToolkit().getScreenSize();
int screenWidth=screenSize.width;
int screenHeight=screenSize.height;
Dimension frameSize=myMainFrame.getSize();
int x=(screenWidth-frameSize.width)/2;
int y=(screenHeight-frameSize.height)/2;
myMainFrame.setLocation(x,y);
myMainFrame.setVisible(true);
JMenuBar myJmb=new JMenuBar();
myMainFrame.setJMenuBar(myJmb);//
JMenu fileMenu=new JMenu("文件");
JMenu editMenu=new JMenu("编辑");
myJmb.add(fileMenu);
myJmb.add(editMenu);
fileMenu.add(new JMenuItem("创建新文件"));
fileMenu.add(new JMenuItem("打开"));
fileMenu.add(new JMenuItem("保存"));
fileMenu.add(new JMenuItem("另存为"));
fileMenu.add(new JMenuItem("关闭推出"));
}
}为什么显示不出来 菜单????
import javax.swing.*;public class myTest
{
public static void main(String args[])
{
JFrame myMainFrame=new JFrame("主窗口");
myMainFrame.setSize(400,200);
myMainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Dimension screenSize=Toolkit.getDefaultToolkit().getScreenSize();
int screenWidth=screenSize.width;
int screenHeight=screenSize.height;
Dimension frameSize=myMainFrame.getSize();
int x=(screenWidth-frameSize.width)/2;
int y=(screenHeight-frameSize.height)/2;
myMainFrame.setLocation(x,y);
//myMainFrame.setVisible(true);
JMenuBar myJmb=new JMenuBar();
myMainFrame.setJMenuBar(myJmb);//
JMenu fileMenu=new JMenu("文件");
JMenu editMenu=new JMenu("编辑");
myJmb.add(fileMenu);
myJmb.add(editMenu);
fileMenu.add(new JMenuItem("创建新文件"));
fileMenu.add(new JMenuItem("打开"));
fileMenu.add(new JMenuItem("保存"));
fileMenu.add(new JMenuItem("另存为"));
fileMenu.add(new JMenuItem("关闭推出"));
// 更改到此处
myMainFrame.setVisible(true);
}
}
import java.awt.*;
import javax.swing.*;public class myTest
{
public static void main(String args[])
{
JFrame myMainFrame=new JFrame("主窗口");
myMainFrame.setSize(400,200);
myMainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Dimension screenSize=Toolkit.getDefaultToolkit().getScreenSize();
int screenWidth=screenSize.width;
int screenHeight=screenSize.height;
Dimension frameSize=myMainFrame.getSize();
int x=(screenWidth-frameSize.width)/2;
int y=(screenHeight-frameSize.height)/2;
myMainFrame.setLocation(x,y);
myMainFrame.setVisible(true);
JMenuBar myJmb=new JMenuBar();
myMainFrame.setJMenuBar(myJmb);//
JMenu fileMenu=new JMenu("文件");
JMenu editMenu=new JMenu("编辑");
myJmb.add(fileMenu);
myJmb.add(editMenu);
fileMenu.add(new JMenuItem("创建新文件"));
fileMenu.add(new JMenuItem("打开"));
fileMenu.add(new JMenuItem("保存"));
fileMenu.add(new JMenuItem("另存为"));
fileMenu.add(new JMenuItem("关闭推出"));
// 使刚添加的组件可见
myMainFrame.validate();
}
}