Java实验6

dbq时隔这么久我总算又来更新了

这次说说一个很好玩的类，JLabel的如何改里面字的属性

label.setFont(new Font("宋体", 0 , 15)); 这个指的是里面字体是宋体，正常（无样式），15是字号。再来看一个

label.setFont(new Font("宋体", Font.ITALIC , 15)); ITALIC这个是指斜体

package experiment;

import java.awt.BorderLayout;

import java.awt.Container;

import java.awt.Font;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.util.Calendar;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

public class ShenYue extends JFrame implements ActionListener

{

    JButton button1, button2, button3;

    JLabel label;

    ShenYue() {

        super("JButtonDemo");

        label = new JLabel("这里是文字", JLabel.CENTER);

        button1 = new JButton("普通");

        button1.setActionCommand("putong"); // 设置动作命令为putong

        button1.addActionListener(this); // 注册事件监听器

        button2 = new JButton("黑体");

        button2.setActionCommand("heiti"); // 设置动作命令为heiti

        button2.addActionListener(this); // 注册事件监听器

        button3 = new JButton("xieti");

        button3.setActionCommand("quit"); // 设置动作命令为xieti

        button3.addActionListener(this); // 注册事件监听器

        getContentPane().add(label, BorderLayout.NORTH);

        getContentPane().add(button1, BorderLayout.WEST);

        getContentPane().add(button2, BorderLayout.CENTER);

        getContentPane().add(button3, BorderLayout.EAST);

    }

    public void actionPerformed(ActionEvent e)

    {

        Calendar c = Calendar.getInstance(); // 得到系统日历类的对象

        if (e.getActionCommand().equals("putong"))

        {

            label.setText("这里是文字");

            label.setFont(new Font("宋体", 0 , 15));

            label.setHorizontalAlignment(JLabel.CENTER);// 设置标签的文本居中

        }

        else if (e.getActionCommand().equals("heiti"))

        {

            label.setText("这里是文字");

            label.setFont(new Font("黑体", 0 , 15));

            label.setHorizontalAlignment(JLabel.CENTER);// 设置标签的文本居中

        }

        else

        {

            label.setText("这里是文字");

            label.setHorizontalAlignment(JLabel.CENTER);

            label.setFont(new Font("宋体", Font.ITALIC , 15));

        }

    }

    public static void main(String args[]) {

        JFrame frame = new ShenYue();

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.pack();

        frame.setVisible(true);

    }

}

package experiment;

import java.awt.BorderLayout;

import java.awt.Container;

import java.awt.FlowLayout;

import java.awt.Font;

import java.util.Calendar;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class ShenYue extends JFrame implements ItemListener

{

    JButton button1, button2, button3;

    JLabel jlb;

    ShenYue()

    {

        super("ShenYue");

        setSize(400, 200);

        setVisible(true);

        Container contentPane = getContentPane();

        contentPane.setLayout(new FlowLayout());

        JComboBox jc = new JComboBox();

        jc.addItem(10);

        jc.addItem(14);

        jc.addItem(18);

        jc.addItemListener(this);

        contentPane.add(jc);

        jlb = new JLabel("这里是文字", JLabel.CENTER);

        jlb.setFont(new Font("宋体",0,20));

        contentPane.add(jlb);

        validate();

        addWindowListener(new WindowAdapter()

        {

            public void windowClosing(WindowEvent e)

            {

                System.exit(0);

            }

        });

    }

    public void itemStateChanged(ItemEvent ie)

    {

        int s = (int) ie.getItem();

        jlb.setText("这里是文字");

        jlb.setFont(new Font("宋体", 0 , s));

    }

    public static void main(String args[])

    {

        new ShenYue();

    }

}

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