黑马程序员------java基础----GUI增加菜单

最新推荐文章于 2015-07-10 11:03:14 发布

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最新推荐文章于 2015-07-10 11:03:14 发布

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黑马程序员------java基础----GUI增加菜单

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class MainFrame extends JFrame implements ActionListener{
private Container cont;
private JButton btnLeft;
private JButton btnCenter;
private JButton btnRight;
private JButton btnBorder;
private JButton btnGrid;
private JLabel labHit;
private JMenuBar menuBar;
private JMenu mOperation;
private JMenu mHelp;
private JMenuItem mItemFlowLeft;
private JMenuItem mItemFlowCenter;
private JMenuItem mItemFlowRight;
private JMenuItem mItemBorder;
private JMenuItem mItemGrid;
private JPanel panelMenu;
private JPanel panelCompent;

public MainFrame(){
this.setTitle("第一个界面");
this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
this.setSize(400, 300);
this.setLocation(300, 300);

cont = this.getContentPane();
// this.setLayout(new GridLayout(3,2));
this.setLayout(null);
panelMenu = new JPanel();
panelMenu.setLayout(new FlowLayout(FlowLayout.LEFT));
panelMenu.setBounds(0, 0, 400, 30);
panelCompent = new JPanel();
panelCompent.setLayout(new GridLayout(3,2));
panelCompent.setBounds(0, 30, 400, 240);
cont.add(panelMenu);
cont.add(panelCompent);
addMenu();
panelMenu.add(menuBar);
btnLeft = new JButton("Left");
btnCenter = new JButton("Center");
btnRight = new JButton("Right");
btnBorder = new JButton("边界");
btnGrid = new JButton("网格");
labHit = new JLabel("网格布局管理器");
panelCompent.add(btnLeft);
panelCompent.add(btnCenter);
panelCompent.add(btnRight);
panelCompent.add(btnBorder);
panelCompent.add(btnGrid);
panelCompent.add(labHit);
btnLeft.addActionListener(this);
btnCenter.addActionListener(this);
btnRight.addActionListener(this);
btnBorder.addActionListener(this);
btnGrid.addActionListener(this);
this.setVisible(true);
}
public void addMenu(){
    menuBar = new JMenuBar();
    mOperation = new JMenu("布局操作");
    mHelp = new JMenu("帮助");
    mItemFlowLeft = new JMenuItem("流式左靠齐");
    mItemFlowCenter = new JMenuItem("流式居中");
    mItemFlowRight = new JMenuItem("流式右靠齐");
    mItemBorder = new JMenuItem("边界");
    mItemGrid = new JMenuItem("网格");
    mItemFlowLeft.addActionListener(this);
    mItemFlowCenter.addActionListener(this);
    mItemFlowRight.addActionListener(this);
    mItemBorder.addActionListener(this);
    mItemGrid.addActionListener(this);
    mOperation.add(mItemFlowLeft);
    mOperation.add(mItemFlowCenter);
    mOperation.add(mItemFlowRight);
    mOperation.add(mItemBorder);
    mOperation.add(mItemGrid);
    menuBar.add(mOperation);
    menuBar.add(mHelp);
}
public void actionPerformed(ActionEvent aEvt){
if((aEvt.getSource() == btnLeft)
      || (aEvt.getSource() == mItemFlowLeft)){
   panelCompent.setLayout(new FlowLayout(FlowLayout.LEFT));
   labHit.setText("流式布局管理器左靠齐");
}
else{
   if((aEvt.getSource() == btnRight)
     || (aEvt.getSource() == mItemFlowRight)){
    panelCompent.setLayout(new FlowLayout(FlowLayout.RIGHT));
    labHit.setText("流式布局管理器右靠齐");
   }
   else{
    if((aEvt.getSource() == btnCenter)
      || (aEvt.getSource() == mItemFlowCenter)){
     panelCompent.setLayout(new FlowLayout(FlowLayout.CENTER));
     labHit.setText("流式布局管理器居中");
    }
    else{
     if((aEvt.getSource() == btnGrid)
      || (aEvt.getSource() == mItemGrid)){
      panelCompent.setLayout(new GridLayout(3,2));
      labHit.setText("网格布局管理器");
     }
     else{
      if((aEvt.getSource() == btnBorder)
      || (aEvt.getSource() == mItemBorder)){
       panelCompent.setLayout(new BorderLayout());

       labHit.setText("边界布局管理器左靠齐");
       panelCompent.add(btnLeft, "West");
       panelCompent.add(btnCenter, "Center");
       panelCompent.add(btnRight, "East");
       panelCompent.add(btnBorder, "North");
       panelCompent.add(btnGrid, "South");
//       cont.add(labHit);
      }
     }
    }
   }
}
}
public static void main(String[] args){
new MainFrame();
}