[Java]_ch15.6_CheckBox元件事件處理

[Java]_ch15.6_CheckBox元件事件處理



package YPU;



import java.awt.Button;

import java.awt.Checkbox;

import java.awt.CheckboxGroup;

import java.awt.Color;

import java.awt.Font;

import java.awt.Frame;

import java.awt.Label;

import java.awt.TextArea;

import java.awt.TextField;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;



public class MyFrame extends Frame implements ActionListener{

Label lb=new Label();

Label lb1=new Label("國文: ");

Label lb2=new Label("英文: ");

Label lb3=new Label("數學: ");

Button btn1=new Button("紅色");

Button btn2=new Button("綠色");

Button btn3=new Button("藍色");

Button btn4=new Button("離開");

Button btn5=new Button("送出");

Button btn6=new Button("清除");

Button btn7=new Button("計算");

Button btn8=new Button("清除");

TextField tf=new TextField();

TextField tf1=new TextField();

TextField tf2=new TextField();

TextField tf3=new TextField();

TextArea ta=new TextArea("結果顯示如下:\n",10,10,TextArea.SCROLLBARS_VERTICAL_ONLY);

Checkbox cb1=new Checkbox("加權1.2");

Checkbox cb2=new Checkbox("加權1.5",true);

Checkbox cb3=new Checkbox("加權1.8");

public MyFrame(String name){

super(name);

setLayout(null);

setBackground(Color.PINK);

setSize(300,300);

setLocation(800,300);

setVisible(true);





lb.setText("視窗元件設計");

lb.setBackground(Color.YELLOW);

lb.setSize(200, 50);

lb.setLocation(50, 50);

btn1.setSize(100, 50);

btn1.setLocation(50, 110);

btn2.setSize(100, 50);

btn2.setLocation(150, 110);

add(btn1);

add(btn2);

add(lb);

}

public MyFrame(String name,int w,int h,Color color){

super(name);

setLayout(null);

setBackground(color);

setSize(w,h);

setLocation(800,300);

setVisible(true);

Font lbFont=new Font("新細明體",Font.BOLD+Font.ITALIC,24);

Font btnFont=new Font("新細明體",Font.BOLD,14);

Color btnColor=new Color(255,0,255);

lb.setText("視窗元件設計");

lb.setBackground(Color.YELLOW);

lb.setSize(200, 50);

lb.setLocation(50, 50);

lb.setFont(lbFont);

lb.setAlignment(Label.CENTER);

btn1.setSize(50, 30);

btn1.setLocation(50, 110);

btn1.setFont(btnFont);

btn1.setForeground(btnColor);

btn2.setSize(50, 30);

btn2.setLocation(100, 110);

btn2.setFont(btnFont);

btn2.setForeground(btnColor);

btn3.setBounds(150, 110, 50, 30);

btn3.setFont(btnFont);

btn3.setForeground(btnColor);

btn4.setBounds(200, 110, 50, 30);

btn4.setFont(btnFont);

btn4.setForeground(btnColor);

tf.setBounds(50, 150, 100, 30);

tf.setEchoChar('*');

btn5.setBounds(150, 150, 50, 30);

btn6.setBounds(200, 150, 50, 30);

lb1.setBounds(50, 190, 50, 30);

tf1.setBounds(100, 190, 100, 30);

lb2.setBounds(50, 220, 50, 30);

tf2.setBounds(100, 220, 100, 30);

lb3.setBounds(50, 250, 50, 30);

tf3.setBounds(100, 250, 100, 30);

btn7.setBounds(200, 190, 50, 45);

btn8.setBounds(200, 235, 50, 45);

ta.setEditable(false);

cb1.setBounds(50, 280, 70, 30);

cb2.setBounds(120, 280, 70, 30);

cb3.setBounds(190, 280, 70, 30);

ta.setBounds(50, 310, 200, 100);

CheckboxGroup grp=new CheckboxGroup();

cb1.setCheckboxGroup(grp);

cb2.setCheckboxGroup(grp);

cb3.setCheckboxGroup(grp);

add(btn4);

add(btn3);

add(btn1);

add(btn2);

add(btn5);

add(btn6);

add(btn7);

add(btn8);

add(lb);

add(lb1);

add(lb2);

add(lb3);

add(tf);

add(tf1);

add(tf2);

add(tf3);

add(ta);

add(cb1);

add(cb2);

add(cb3);

}

@Override

public void actionPerformed(ActionEvent e) {

Button btn=(Button)e.getSource();

if(btn==btn1){

lb.setBackground(Color.RED);

lb.setText(btn1.getLabel());

}else if(btn==btn2){

lb.setBackground(Color.GREEN);

lb.setText(btn2.getLabel());

}else if(btn==btn3){

lb.setBackground(Color.BLUE);

lb.setText(btn3.getLabel());

}else if(btn==btn4){

System.exit(0);

}else if(btn==btn5){

lb.setText(tf.getText());

ta.append(tf.getText()+"\n");

if(cb1.getState())

ta.append(cb1.getLabel()+"\n");

if(cb2.getState())

ta.append(cb2.getLabel()+"\n");

if(cb3.getState())

ta.append(cb3.getLabel()+"\n");

}else if(btn==btn6){

lb.setText("");

tf.setText("");

ta.setText("");

}else if(btn==btn7){



String s1=tf1.getText();

int n1=Integer.parseInt(s1);

String s2=tf2.getText();

double n2=Double.parseDouble(s2);

String s3=tf3.getText();

int n3=Integer.parseInt(s3);

double sum=n1+n2+n3;

double avg=(n1+n2+n3)/3;

ta.append("國文:"+s1+" 英文:"+s2+" 數學:"+s3+"\n");

ta.append("總分:"+sum+"\n");   

ta.append("平均:"+avg+"\n"); 

ta.append((avg>=60)?"恭喜及格\n":"抱歉不及格!\n");

if(avg>=90 && avg<=100)

ta.append("A級\n");

if(avg>=80 && avg<90)

ta.append("B級\n");

if(avg>=70 && avg<80)

ta.append("C級\n");

if(avg>=60 && avg<70)

ta.append("D級\n");

if(avg>=0 && avg<60)

ta.append("E級\n");

if(cb1.getState()){

ta.append("權重:"+cb1.getLabel()+"\n");

ta.append("加權總分:"+sum*1.2+"\n加權平均:"+sum*1.2/3);

}else if(cb2.getState()){

ta.append("權重:"+cb2.getLabel()+"\n");

ta.append("加權總分:"+sum*1.5+"\n加權平均:"+sum*1.5/3);

}else if(cb3.getState()){

ta.append("權重:"+cb3.getLabel()+"\n");

ta.append("加權總分:"+sum*1.8+"\n加權平均:"+sum*1.8/3);

}



}else if(btn==btn8){

tf1.setText("");

tf2.setText("");

tf3.setText("");

ta.setText("");

}

}

}