关于GUI编程初步了解与运用，以及组合和内部类的思想
package com.company;
import java.awt.*;
class myFrame extends Frame {
static int id = 1;
public myFrame (int x, int y, int w, int h ,Color color)
{
super("第" +(id ++ )+"个窗口");
setBounds(x, y, w, h);
setVisible(true);
setBackground(color);
}
}
public class Main {
public static void main(String []args){
myFrame frame01 = new myFrame(100,100,200,200,Color.red);
frame01.setResizable(false);
myFrame frame02 = new myFrame(300,100,200,200,Color.blue);
myFrame frame03 = new myFrame(100,300,200,200,Color.black);
myFrame frame04 = new myFrame(300,300,200,200,Color.pink);
}
}
布局
setLayout(new flowLayout(flowLayout.Right))流式布局，此时设置了靠右，可以更改为LEFT，CENTER等
frame.add(xxx,borderLayout.EAST)东西南北中式布局，其中的EAST可以更改为WEST,NORTH等等
setLayout(new GridLayout(rows,cols))表格式布局，可以分成rows行，cols列
public class lesson01 {
public static void main(String []args){
new MyFrame();
}
}
class MyFrame extends Frame {
public MyFrame(){
setVisible(true);
TextField textfield = new TextField();
add(textfield);
MyActionListener2 myActionListener2 = new MyActionListener2();
//按下enter键，就会触发事件
textfield.addActionListener(myActionListener2);
//将文本框中的内容设置为*
textfield.setEchoChar('*');
pack();
}
}
class MyActionListener2 implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
TextField textField = (TextField) e.getSource();
System.out.println(textField.getText());
textField.setText("");
}
}
采用面向对象思想所做的计算器
package com.company;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class lesson01 {
public static void main(String []args){
new Calculator();
}
}
class Calculator extends Frame{
TextField t1,t2,t3;
public Calculator(){
setLayout(new FlowLayout());
setVisible(true);
Button b1 = new Button("=");
Label label = new Label("+");
t1 = new TextField(10);//设置列数
t2 = new TextField(10);
t3 = new TextField(20);
b1.addActionListener(new MyCalculatorListener(this));//将自己代入实例
add(t1);
add(label);
add(t2);
add(b1);
add(t3);
pack();
}
}
class MyCalculatorListener implements ActionListener{
Calculator calculator = null;//先将自己设置为空
public MyCalculatorListener(Calculator calculator){
this.calculator = calculator;//将引入的替换掉自己创建的
}
@Override
public void actionPerformed(ActionEvent e) {
int a = Integer.parseInt(calculator.t1.getText());//下面都是采用面向对象的方法
int b = Integer.parseInt(calculator.t2.getText());
calculator.t3.setText(""+(a+b));
calculator.t2.setText("");
calculator.t1.setText("");
}
}
此刻我在想，能不能采用更简单的方式呢？
没错，就是用内部类的方法，他的最大好处就是可以畅通无阻的访问外部的属性和方法；
代码改进后如下
package com.company;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class lesson01 {
public static void main(String []args){
new Calculator();
}
}
class Calculator extends Frame{
TextField t1,t2,t3;
public Calculator(){
setLayout(new FlowLayout());
setVisible(true);
Button b1 = new Button("=");
Label label = new Label("+");
t1 = new TextField(10);
t2 = new TextField(10);
t3 = new TextField(20);
b1.addActionListener(new MyCalculatorListener());
add(t1);
add(label);
add(t2);
add(b1);
add(t3);
pack();
}
private class MyCalculatorListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
int a = Integer.parseInt(t1.getText());
int b = Integer.parseInt(t2.getText());
t3.setText(""+(a+b));
t2.setText("");
t1.setText("");
}
}
}
