public class frame02 {
public void window(){
frame frame =new frame("java窗口");
//设置可见性
frame.setVisible(true);
//设置窗口大小
frame.setSize(400,400);
//设置背景颜色
frame.setBackground(Color.YELLOW);
//弹出初始位置
frame.setLocation(1000,200);
//设置大小固定
frame.setResizable(false);
}
}
面板panel
可以看成一个空间，但是不能单独存在，需要放在frame上
布局管理器- 流式布局
public class frameStrame {
public static void main(String[] args) {
frame frame =new frame();
frame.setLayout(new FlowLayout(FlowLayout.CENTER));//设置布局为流式布局，居中
frame.setSize(200,200);
frame.setVisible(true);//设置可见性
Button button1 =new Button("按钮1");
Button button2 =new Button("按钮2");
Button button3 =new Button("按钮3");
frame.add(button1);
frame.add(button2);
frame.add(button3);
}
}
- 盒式布局
public class frameBorder {
public static void main(String[] args) {
frame frame = new frame();
Button left=new Button("left");
Button right=new Button("right");
Button top=new Button("top");
Button center=new Button("center");
Button under=new Button("under");
frame.add(left,BorderLayout.EAST);
frame.add(right,BorderLayout.WEST);
frame.add(under,BorderLayout.SOUTH);
frame.add(top,BorderLayout.NORTH);
frame.add(center,BorderLayout.CENTER);
frame.setVisible(true);
frame.setSize(200,200);
}
}
- 表格式布局
public class frameGrid {
public static void main(String[] args) {
frame frame = new frame();
frame.setVisible(true);
frame.setSize(200,200);
Button button1=new Button("north");
Button button2=new Button("south");
Button button3=new Button("center");
Button button4=new Button("east");
Button button5=new Button("west");
frame.setLayout(new GridLayout(3,2));
frame.add(button1);
frame.add(button2);
frame.add(button3);
frame.add(button4);
frame.add(button5);
}
}
- 窗口嵌套面板
public class frameLayoutTest {
public static void main(String[] args) {
frame frame = new frame();
frame.setVisible(true);
frame.setSize(500, 500);
frame.setLayout(new GridLayout(2,1));
Panel p1 = new Panel(new BorderLayout());
Panel p2 = new Panel(new GridLayout(2,1));
Panel p3 = new Panel(new BorderLayout());
Panel p4 = new Panel(new GridLayout(2,2));
//上半部分p1
p1.add(new Button("east1"),BorderLayout.EAST);
p1.add(new Button("west1"),BorderLayout.WEST);
p1.add(p2,BorderLayout.CENTER);
p2.add(new Button("1"));
p2.add(new Button("2"));
//下半部分p3
p3.add(new Button("east2"),BorderLayout.EAST);
p3.add(new Button("west2"),BorderLayout.WEST);
p3.add(p4,BorderLayout.CENTER);
p4.add(new Button("3"));
p4.add(new Button("4"));
p4.add(new Button("5"));
p4.add(new Button("6"));
frame.add(p1);
frame.add(p3);
}
}
事件监听
关闭窗口和建立一个按钮交互
public class ActionListener {
public static void main(String[] args) {
frame frame = new frame();
Button button =new Button();
Action1 one = new Action1();
button.addActionListener(one);
frame.setVisible(true);
frame.setSize(500,500);
frame.add(button);
WindowClose(frame);
}
private static void WindowClose(frame fr){
fr.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
class Action1 implements java.awt.event.ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("我被点了");
}
}
多个按钮共享一个事件
public class ActionLister1 {
public static void main(String[] args) {
frame frame = new frame();
Button button1=new Button("num1");
Button button2=new Button("num2");
Action2 action2 = new Action2();
button2.addActionListener(action2);
button1.addActionListener(action2);
button1.setActionCommand("有点小爽");//显式地定义触发后返回的值
frame.add(button1,BorderLayout.NORTH);
frame.add(button2,BorderLayout.SOUTH);
frame.setVisible(true);
frame.setSize(500,500);
}
}
class Action2 implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
//e.() 获得按钮上的信息
System.out.println("我被点了"+e.getActionCommand());
}
}
模拟密码框中的窗体行为
package Test;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Text {
public static void main(String[] args) {
new Fr();
}
}
class Fr extends frame{//继承frame后不用再创建对象可以直接调用方法布局窗口
public Fr(){
TextField textField=new TextField();//新建文本框对象
add(textField); //窗体中加入文本框
Action3 action3 =new Action3();
textField.addActionListener(action3);//将Action3类中写的事件方法引入文本框中
setVisible(true);
setSize(500,500);//这行代码没有生效？
pack();
}
}
class Action3 implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
TextField field =(TextField)e.getSource();//getsource方法返回的是一个Object对象，可以下转型为任意类型的对象
System.out.println(field.getText());
}
}
简易计算器实现（只实现加法）
package Test;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Calculator {
public static void main(String[] args) {
new Cal();
}
}
class Cal extends frame{
public Cal(){
TextField f1 = new TextField(10);
TextField f2 = new TextField(10);
TextField f3 = new TextField(20);
Button button = new Button("=");
Label l1 = new Label("+");
button.addActionListener(new Action4(f1,f2,f3));
setLayout(new FlowLayout());
add(f1);
add(l1);
add(f2);
add(button);
add(f3);
setVisible(true);
pack();
}
}
class Action4 implements ActionListener{
private TextField f1,f2,f3;//传进来的是三个TextField类型的对象，可以控制文本框，对文本框的内容进行操作
@Override
public void actionPerformed(ActionEvent e) {
int n1 = Integer.parseInt(f1.getText()); //getText()后得到的是String类型的变量
int n2 = Integer.parseInt(f2.getText());
int n3 = Integer.parseInt(f3.getText());
f3.setText(""+(n1+n2));
f1.setText("");
f2.setText("");
}
public Action4(TextField f1,TextField f2,TextField f3) {
this.f1=f1;
this.f2=f2;
this.f3=f3;
}
}
