[Java]_ch15.5_TextArea元件事件處理

[Java]_ch15.5_TextArea元件事件處理



package YPU;



import java.awt.Button;

import java.awt.Checkbox;

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();

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");

TextField tf=new TextField();

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

Checkbox cb1=new Checkbox("游泳");

Checkbox cb2=new Checkbox("閱讀",true);

Checkbox cb3=new Checkbox("唱歌");

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);

ta.setBounds(50, 190, 200, 100);

ta.setEditable(false);

cb1.setBounds(50, 300, 70, 30);

cb2.setBounds(120, 300, 70, 30);

cb3.setBounds(190, 300, 70, 30);

add(btn4);

add(btn3);

add(btn1);

add(btn2);

add(btn5);

add(btn6);

add(lb);

add(tf);

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("");

}

}

}

package YPU;

import java.awt.Button;

import java.awt.Color;

public class A16 {

public static void main(String[] args) {

MyFrame frm=new MyFrame("國立交通大學",300,500,Color.PINK);

frm.btn1.addActionListener(frm);

frm.btn2.addActionListener(frm);

frm.btn3.addActionListener(frm);

frm.btn4.addActionListener(frm);

frm.btn5.addActionListener(frm);

frm.btn6.addActionListener(frm);

}

}