如何用java图形用户界面实现下面的功能：1.运行时出现如下面板 2.单击改变字体大小时可以使得字体大小加2
在事件方法中再new个新的并更新按钮文本再显示，如果只是改变按钮的文本，把actionPerformed方法中的最后注释掉的两句留下，前面全删除就可以了。
import java.awt.FlowLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.SwingUtilities;public class Win1 extends JFrame implements ActionListener{ private JButton btn1=new JButton("上课！"); private JButton btn2=new JButton("下课！"); public Win1() { btn1.addActionListener(this); btn2.addActionListener(this); this.setLayout(new FlowLayout()); this.add(btn1); this.add(btn2); this.setTitle("事件处理示例"); this.setSize(300,100); this.setLocationRelativeTo(null);; this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } @Override public void actionPerformed(ActionEvent e) { Win1 win=new Win1(); win.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); win.setLocation(this.getX()+310,this.getY()); win.btn1.setText("上课啦！！！"); win.btn2.setText("下课啦！！！"); win.setVisible(true); //如果只是改变按钮文本，删除上面6行代码，请用下面的这2句 //this.btn1.setText("上课啦！！！"); //this.btn2.setText("下课啦！！！"); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { Win1 win=new Win1(); win.setVisible(true); } }); }}
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Demo extends JFrame implements ActionListener{
private JButton jb;//定义按钮
private JPanel jp;//定义面板
public Demo(){//构造函数
jb = new JButton("单击这里");//实例化按钮对象
jb.addActionListener(this);//添加侦听器
jp = new JPanel();//实例化面板
jp.setLayout(new FlowLayout());
jp.setSize(400,300);
jp.setVisible(true);
jp.add(jb);
jb.setPreferredSize(new Dimension(90, 30));
jb.setVisible(true);
this.add(jp);
this.setTitle("窗口1");
this.setSize(400,300);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this. setLocationRelativeTo(null);
}
public static void main(String[] args){
System.out.println("程序开始运行···");
new Demo();
}
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
String arg = e.getActionCommand();//获取事件侦听参数
if (arg == "单击这里") {
Demo d = new Demo();
d.setTitle("窗口2");
d.setBounds(10,10,400,300);
}
}
}
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class HelpYou extends JFrame{
public JButton up = new JButton("改变字体大小");
public JButton left = new JButton("设置字体");
public JButton down = new JButton("打开调色面板");
public JTextArea area = new JTextArea("这是有一个文本区，用来输入文本");
public int fontSize = 12;//设置默认字体大小为12
public JPanel panel = new JPanel();
public Object SetFont;
public HelpYou(){
innit();
}
public void innit(){//初始化面板
BorderLayout bl = new BorderLayout();
panel.setLayout(bl);
panel.add(up,bl.NORTH);
panel.add(left,bl.WEST);
panel.add(down,bl.SOUTH);
panel.add(area,bl.CENTER);
area.setLineWrap(true);//设置文本域自动换行
up.addActionListener(new MyClick());
left.addActionListener(new MyClick());
down.addActionListener(new MyClick());
this.setContentPane(panel);
this.setTitle("My Java");
this.setSize(400,300);
this.setVisible(true);
this.setResizable(false);//设置窗体大小不可改
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
class MyClick implements ActionListener{
public void actionPerformed(ActionEvent e) {
if(e.getSource()==up){
fontSize+=2;
area.setFont(new Font("宋体",Font.PLAIN,fontSize));
}
if(e.getSource()==left){
SetFont sf = new SetFont();
}
if(e.getSource()==down){
SetColor sc = new SetColor();
}
}
}
class SetColor extends JFrame{//设置字体的面板
public JButton ok = new JButton("确定");
public JButton cancel = new JButton("取消");
public JPanel panel = new JPanel();
public SetColor(){
innit();
}
public void innit(){
JPanel colorPanel = new JPanel();
colorPanel.setLayout(new GridLayout(1, 8));//一共设置了7种颜色
JButton[] cButton = new JButton[8];
for(int i=0;i<8;i++){
cButton[i] = new JButton();//对颜色按钮初始化
colorPanel.add(cButton[i]);
}
cButton[0].setBackground(Color.RED);
cButton[1].setBackground(Color.ORANGE);
cButton[2].setBackground(Color.YELLOW);
cButton[3].setBackground(Color.GREEN);
cButton[4].setBackground(Color.BLUE);
cButton[5].setBackground(Color.CYAN);
cButton[6].setBackground(Color.PINK);
cButton[7].setBackground(Color.BLACK);
colorPanel.add(cButton[0]);
colorPanel.setLayout(new FlowLayout());//设置默认布局
panel.add(colorPanel);
panel.add(ok);
panel.add(cancel);
this.setSize(350,120);
this.setLocation(0,50);
this.setContentPane(panel);
this.setVisible(true);
this.setResizable(false);//设置窗体大小不可改
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
class SetFont extends JFrame{//设置字体的面板
public JButton ok = new JButton("确定");
public JButton cancel = new JButton("取消");
public JComboBox size = new JComboBox();
public JComboBox type = new JComboBox();
public JPanel fontPanel = new JPanel();
public SetFont(){
innit();
}
public void innit(){
fontPanel.setLayout(new FlowLayout());//设置默认布局
fontPanel.add(size);
fontPanel.add(type);
fontPanel.add(ok);
fontPanel.add(cancel);
size.addItem("选择字体");
size.addItem("12");
size.addItem("20");
size.addItem("30");
size.addItem("50");
type.addItem("选择字形");
type.addItem("宋体");
type.addItem("黑体");
type.addItem("微软雅黑");
this.setSize(400,100);
this.setLocation(0,100);
this.setContentPane(fontPanel);
this.setVisible(true);
this.setResizable(false);//设置窗体大小不可改
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
public static void main(String[] args) {
HelpYou hy = new HelpYou();
}
}
事件监听不会加？
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