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3.Swing

3.1 窗口 面板

//标签居中class Myframe2 extends JFrame{
       public void init(){
           this.setBounds(10,10,200,300);        this.setVisible(true);        JLabel lable=new JLabel("欢迎来到狂神");        this.add(lable);        //让文本标签居中，设置水平对齐        lable.setHorizontalAlignment(SwingConstants.CENTER);        //获得一个容器        Container container=this.getContentPane();        container.setBackground(Color.yellow);    }}

//初始化public class javaPractice {
       //init();初始化    public void init(){
           //顶级窗口        JFrame jf=new JFrame("这是一个JFrame窗口");        jf.setBounds(10,10,200,300);        jf.setVisible(true);        jf.setBackground(Color.blue);        JLabel lable=new JLabel("欢迎来到狂神");        jf.add(lable);        //关闭事件        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    }    public static void main(String[] args) {
           //建立一个窗口        new javaPractice().init();    }}

3.2 弹窗

public class javaPractice extends JFrame {
       public javaPractice(){
           this.setVisible(true);        this.setBounds(100,100,700,500);        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);        //JFrame  放东西   容器        Container container=this.getContentPane();        //绝对布局        container.setLayout(null);        //按钮        JButton button=new JButton("点击弹出一个对话框");        button.setBounds(30,30,200,50);        //点击这个按钮的时候，弹出一个窗口        button.addActionListener(new ActionListener() {
               @Override            public void actionPerformed(ActionEvent e) {
                   //弹窗                new MyDialog();            }        });        container.add(button);    }    public static void main(String[] args) {
           new javaPractice();    }}class MyDialog extends JDialog{
       public MyDialog() {
           this.setVisible(true);        this.setBounds(200,200,400,400);        //默认就有this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);        Container container=this.getContentPane();        container.setLayout(null);        container.add(new Label("学习java"));    }}

3.3 标签

label

new TLabel("xxx")

图标 icon

//图标、需要实现的类，Frame继承public class javaPractice extends JFrame implements Icon {
       private int width;    private int height;    public javaPractice()  {
   //无参构造    }    public javaPractice(int width,int height)  {
           this.width=width;        this.height=height;    }    public void  init(){
           javaPractice iconDemo=new javaPractice(15,15);        //图标放在标签上，也可以放在按钮上！        JLabel label =new JLabel("icontest",iconDemo,SwingConstants.CENTER);        Container container=getContentPane();        container.add(label);        this.setVisible(true);        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    }    public static void main(String[] args) {
           new javaPractice().init();    }    @Override    public void paintIcon(Component c, Graphics g, int x, int y) {
           g.fillOval(x,y,width,height);    }    @Override    public int getIconWidth() {
           return this.width;    }    @Override    public int getIconHeight() {
           return this.height;    }}

图片 icon

public class javaPractice extends JFrame {
       public javaPractice(){
           //获取图片的地址        JLabel label=new JLabel("Imageicon");        URL url=javaPractice.class.getResource("tx.jpg");        ImageIcon imageIcon=new ImageIcon(url);        label.setIcon(imageIcon);        label.setHorizontalAlignment(SwingConstants.CENTER);        Container container=getContentPane();        container.add(label);        setVisible(true);        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);        setBounds(100,100,200,200);    }    public static void main(String[] args) {
           new javaPractice();    }}

3.4 面板

• JPanel

public class javaPractice extends JFrame {
       public javaPractice(){
           Container container=this.getContentPane();        container.setLayout(new GridLayout(2,1,10,10));        JPanel panel1=new JPanel(new GridLayout(1,3));        panel1.add(new JButton("1"));        panel1.add(new JButton("1"));        panel1.add(new JButton("1"));        container.add(panel1);        this.setVisible(true);        this.setSize(500,500);        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    }    public static void main(String[] args) {
           new javaPractice();    }}

• JScroll

public class javaPractice extends JFrame {
       public javaPractice(){
           Container container=this.getContentPane();        //文本域        JTextArea textArea=new JTextArea(20,50);        textArea.setText("欢迎学习狂神说java");        //Scroll面板        JScrollPane scrollPane=new JScrollPane(textArea);        container.add(scrollPane);        this.setVisible(true);        this.setBounds(100,100,300,500);        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    }    public static void main(String[] args) {
           new javaPractice();    }}

3.5 按钮

• 图片按钮

public class javaPractice extends JFrame {
       public javaPractice(){
           Container container=this.getContentPane();        //将一个图片变为图标        URL resource=javaPractice.class.getResource("tx.jpg");        Icon icon=new ImageIcon(resource);        //把这个图标放在按钮上        JButton button=new JButton();        button.setIcon(icon);        button.setToolTipText("图片按钮");        container.add(button);        this.setVisible(true);        this.setBounds(100,100,300,500);        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    }    public static void main(String[] args) {
           new javaPractice();    }}

• 单选按钮

public class javaPractice extends JFrame {
       public javaPractice(){
           Container container=this.getContentPane();        //将一个图片变为图标        URL resource=javaPractice.class.getResource("tx.jpg");        Icon icon=new ImageIcon(resource);        //单选框        JRadioButton radioButton1=new JRadioButton("button1");        JRadioButton radioButton2=new JRadioButton("button2");        JRadioButton radioButton3=new JRadioButton("button3");        //单选只能选择一个，所以一个组中只能选择一个        container.add(radioButton1,BorderLayout.CENTER);        container.add(radioButton2,BorderLayout.NORTH);        container.add(radioButton3,BorderLayout.SOUTH);        this.setVisible(true);        this.setBounds(100,100,300,500);        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    }    public static void main(String[] args) {
           new javaPractice();    }}

• 复选按钮

public class javaPractice extends JFrame {
       public javaPractice(){
           Container container=this.getContentPane();        //多选框        JCheckBox checkBox01=new JCheckBox("checkBox01");        JCheckBox checkBox02=new JCheckBox("checkBox02");        container.add(checkBox01,BorderLayout.NORTH);        container.add(checkBox02,BorderLayout.SOUTH);        this.setVisible(true);        this.setBounds(100,100,300,500);        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    }    public static void main(String[] args) {
           new javaPracti ce();    }}

3.6 列表

• 下拉框

public class javaPractice extends JFrame {
       public javaPractice(){
           Container container=this.getContentPane();        JComboBox status=new JComboBox();        status.addItem(null);        status.addItem("正在热映");        status.addItem("已下架");        status.addItem("即将上映");        container.add(status);        this.setVisible(true);        this.setBounds(100,100,300,500);        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    }    public static void main(String[] args) {
           new javaPractice();    }}

• 列表框

  public class javaPractice extends JFrame {
           public javaPractice(){
               Container container=this.getContentPane();        //String[] content={"1","2","3"};        Vector contents=new Vector();        //列表中需要加入内容        JList jList=new JList(contents);        contents.add("zhangsan");        contents.add("lisi");        contents.add("wangwu");        container.add(jList);        this.setVisible(true);        this.setBounds(100,100,300,500);        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    }    public static void main(String[] args) {
               new javaPractice();    }}

• 应用场景
  • 选择地区，或者一些单个选项
  • 列表，展示信息，一般是动态扩容

3.7 文本框

• 文本框

public class javaPractice extends JFrame {
       public javaPractice(){
           Container container=this.getContentPane();        JTextField textField=new JTextField("hello");        JTextField textField0=new JTextField("word",20);        container.add(textField,BorderLayout.SOUTH);        container.add(textField0,BorderLayout.NORTH);        this.setVisible(true);        this.setBounds(100,100,300,500);        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    }    public static void main(String[] args) {
           new javaPractice();    }}

• 密码框

public class javaPractice extends JFrame {
       public javaPractice(){
           Container container=this.getContentPane();        //画板        JPasswordField passwordField=new JPasswordField();        passwordField.setEchoChar('*');        container.add(passwordField);        this.setVisible(true);        this.setBounds(100,100,300,500);        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    }    public static void main(String[] args) {
           new javaPractice();    }}

• 文本域

public class javaPractice extends JFrame {
       public javaPractice(){
           Container container=this.getContentPane();        //文本域        JTextArea textArea=new JTextArea(20,50);        textArea.setText("欢迎学习狂神说java");        //Scroll面板        JScrollPane scrollPane=new JScrollPane(textArea);        container.add(scrollPane);        this.setVisible(true);        this.setBounds(100,100,300,500);        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);    }    public static void main(String[] args) {
           new javaPractice();    }}

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