Java图形界面

1、计算器

public class LayoutOutDemo02 extends JFrame {

public LayoutOutDemo02(){
    JPanel panel1 = new JPanel();
    GridLayout layout1 = new GridLayout(4,3);
    panel1.setLayout(layout1);

    for (int i = 1; i <=9; i++) {
        panel1.add(new JButton(""+i));
   }
    panel1.add(new JButton("0"));
    panel1.add(new JButton("start"));
    panel1.add(new JButton("stop"));


    JPanel panel2 = new JPanel(new BorderLayout());

    panel2.add(new JTextField("请输入。。。"),BorderLayout.NORTH);

    panel2.add(panel1,BorderLayout.CENTER);

    add(panel2,BorderLayout.EAST);//右

    //左边加button
    panel2.add(new JButton("确认"),BorderLayout.WEST);

}
public static void main(String[] args) {
    LayoutOutDemo02 frame = new LayoutOutDemo02();
    frame.setSize(400,250);
    frame.setTitle("LayoutExciseDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
}
}

效果：

Snip20181019_7.png

2、设置颜色（java.awt.Color）

    JButton leftButton = new JButton("确认");
    leftButton.setBackground(Color.blue);
    leftButton.setForeground(new Color(122,34,58));
    add(leftButton,BorderLayout.WEST);

3、设置字体（java.awt.Font）

构造方法：public Font（String name,int style,int size）;

    Font font1 = new Font("Malayalam Sangam MN",Font.BOLD+Font.ITALIC,20);
    JLabel lable = new JLabel("12345");
    add(lable,BorderLayout.SOUTH);
    lable.setFont(font1);

4、获取字体家族

     //获取字体数组
    GraphicsEnvironment envirment = GraphicsEnvironment.getLocalGraphicsEnvironment();
    String [] fontName = envirment.getAvailableFontFamilyNames();
    for (int i = 0; i < fontName.length; i++) {
        System.out.println(fontName[i]);
    }

5、练习二

 public class TestSwingCommonFeatures extends JFrame {


public TestSwingCommonFeatures(){

    JPanel panel = new JPanel();
    panel.setLayout(new FlowLayout());

    JButton leftButton = new JButton("left");
    leftButton.setBackground(Color.white);
    JButton centerButton = new JButton("center");
    centerButton.setForeground(Color.GREEN);
    JButton rightButton = new JButton("right");
    //设置工具提示
    rightButton.setToolTipText("right button");

    panel.add(leftButton);
    panel.add(centerButton);
    panel.add(rightButton);
    //给panel添加文字边界
    panel.setBorder(new TitledBorder("ThreeButton"));


    JPanel panel2 = new JPanel();
    panel2.setLayout(new GridLayout(1,2,5,5));

    //定义边界线
    Border lineborder = new LineBorder(Color.BLACK,2);

    JLabel lable = new JLabel("red");
    lable.setFont(new Font("",Font.BOLD,22));
    lable.setBackground(Color.WHITE);
    lable.setForeground(Color.GREEN);
    lable.setBorder(lineborder);

    panel2.add(lable);



    JLabel lable2 = new JLabel("red");
    lable2.setFont(new Font("",Font.BOLD,22));
    lable2.setBackground(Color.WHITE);
    lable2.setForeground(Color.blue);
    lable2.setBorder(lineborder);
    panel2.add(lable2);

    //给Panel2 添加边界线
    panel2.setBorder(new TitledBorder("z这是Panel2"));

    //添加画板
    setLayout(new GridLayout(2,1,5,5));
    add(panel);
    add(panel2);



}


public static void main(String[] args) {

    TestSwingCommonFeatures frame = new TestSwingCommonFeatures();
    frame.setTitle("TestSwingCommonFeatures");
    frame.setSize(500,  300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);

}

}

效果：

Snip20181019_8.png