JAVA SL-275_10/18

JAVA SL-275_10/18
Date: 10/18
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常用的 Java 圖形 Lib (java 7.0 版以後，兩種可以混用)：
AWT
Swing

一般功能表是由三種類別所建立：
MenuBar
Menu
MenuItem

java.lang.Object

java.awt.MenuComponent → java.awt.MenuBar
java.awt.MenuComponent → java.awt.MenuItem ─ java.awt.Menu


設計的參數及概念：

監聽事件 (event listener) 架構圖：

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//app_1.java
import java.awt.*;
import java.awt.event.*;

public class app_1 extends Frame implements ActionListener{
 static app_1 frm=new app_1();
 static Button btn1=new Button("Yellow");
 static Button btn2=new Button("Green");
 static Button btn3=new Button("Exit");
 public static void main(String args[]){
  btn1.addActionListener(frm);
  btn2.addActionListener(frm);
  btn3.addActionListener(frm);
  frm.setTitle("ActionEvent");
     frm.setLayout(new FlowLayout(FlowLayout.CENTER));
     frm.setSize(300,200);
     frm.add(btn1);
     frm.add(btn2);
     frm.add(btn3);
     frm.setVisible(true); //一定要show出，不然無法顯示。
     frm.addWindowListener(new WindowAdapter(){  //視窗右上角x功能
      public void windowClosing(WindowEvent e){
       System.exit(0);
      }
     });
 }
 public void actionPerformed(ActionEvent e){
  Button btn=(Button)e.getSource();//取得事件來源物件。
  if(btn==btn1)
   frm.setBackground(Color.YELLOW);
  if(btn==btn2)
   frm.setBackground(Color.GREEN);
  if(btn==btn3)
   System.exit(0);
 }

}

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//app_2.java
import java.awt.Checkbox;
import java.awt.CheckboxGroup;
import java.awt.*;
import java.awt.event.*;
public class app_2 extends Frame implements ItemListener{
 static app_2 frm=new app_2();
 static Checkbox ckb1=new Checkbox("Java");
 static Checkbox ckb2=new Checkbox("PHP");
 static Label lab=new Label("Select one");
 public static void main(String args[]){
  CheckboxGroup grp=new CheckboxGroup();
  frm.setSize(300,200);
  frm.setTitle("app_2 Programmer");
  frm.setLayout(new FlowLayout(FlowLayout.CENTER));
  ckb1.setCheckboxGroup(grp);
  ckb2.setCheckboxGroup(grp);
  lab.setBackground(Color.orange);
  ckb1.addItemListener((ItemListener) frm);
  ckb2.addItemListener((ItemListener) frm);
  frm.add(ckb1);
  frm.add(ckb2);
  frm.add(lab);
  frm.setVisible(true);
  frm.addWindowListener(new WindowAdapter(){  //視窗右上角x功能
      public void windowClosing(WindowEvent e){
       System.exit(0);
      }
     });
 }
 @Override
 public void itemStateChanged(ItemEvent e) {
  if(ckb1.getState()==true)
   lab.setText("Java");
  else if(ckb2.getState()==true)
   lab.setText("PHP");
  
 }
}

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//app3.java
import java.awt.*;
import java.awt.event.*;

public class app3 extends Frame implements ActionListener{
 static app3 frm=new app3();
 static Label lab=new Label("Hellow JAVA",Label.CENTER);
 static MenuBar mb=new MenuBar();
 static Menu menu1=new Menu("Style");
 static Menu menu2=new Menu("Exit");
 static MenuItem mi1=new MenuItem("plane");
 static MenuItem mi2=new MenuItem("bold");
 static MenuItem mi3=new MenuItem("italic");
 static MenuItem mi4=new MenuItem("close window");
 
 //Dialog --> 要呼叫 show() method 才可以顯示
 static Button close_btn=new Button("Close");
 static Button cancel_btn=new Button("Cancel");
 static Dialog dlg=new Dialog(frm);
 static WinLis wlis=new WinLis();
 
 public static void main(String args[]){
  mb.add(menu1);
  mb.add(menu2);
  menu1.add(mi1);
  menu1.add(mi2);
  menu1.add(mi3);
  menu2.add(mi4);
  mi1.addActionListener(frm);
  mi2.addActionListener(frm);
  mi3.addActionListener(frm);
  mi4.addActionListener(frm);
  lab.setFont(new Font("Dialog",Font.PLAIN,24));
  frm.add(lab);
  frm.setSize(280,150);
  frm.setTitle("app_3 Programmer");
  frm.setMenuBar(mb);
  frm.setVisible(true);
 
  dlg.setTitle("Are you sure?");
  dlg.setSize(140,100);
  dlg.setLayout(new FlowLayout(FlowLayout.CENTER,5,30));
  dlg.add(close_btn);
  dlg.add(cancel_btn);
  close_btn.addActionListener(frm);
  cancel_btn.addActionListener(frm);
  frm.addWindowListener(wlis);
  
  
  
  /*frm.addWindowListener(new WindowAdapter(){  //視窗右上角x功能
      public void windowClosing(WindowEvent e){
       System.exit(0);
      }
     });*/
 }
 
 static class WinLis extends WindowAdapter{
  public void windowClosing(WindowEvent e){
   dlg.setLocation(80, 30);
   dlg.show();
  }
 }
 
 
 @Override
 public void actionPerformed(ActionEvent e) {
  //MenuItem mi=(MenuItem)e.getSource();
  if(e.getSource()==mi1)
   lab.setFont(new Font("Dialog",Font.PLAIN,30));
  else if(e.getSource()==mi2)
   lab.setFont(new Font("Dialog",Font.BOLD,30));
  else if(e.getSource()==mi3)
   lab.setFont(new Font("Dialog",Font.ITALIC,30));
  else if(e.getSource()==mi4)
   frm.dispose();//關閉式窗
     
  //Button btn=(Button)e.getSource();
  else if(e.getSource()==close_btn){
   dlg.dispose();
   frm.dispose();
  }
  else if(e.getSource()==cancel_btn){
   dlg.hide(); //隱藏
  }
 }
}

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