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();
    }
}