Java内部类（分类介绍）-java-编程

普通内部类

package edu.test.ch7;

import javax.swing.JFrame;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.EventQueue;

import javax.swing.JPanel;

import javax.swing.border.EmptyBorder;

import javax.swing.UIManager;

import javax.swing.JButton;

import java.awt.Font;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class ButtonTest extends JFrame {

/**

*

*/

private static final long serialVersionUID=-5726190585100402900L;

private JPanel contentPane;

/**

* Launch the application.

*/

public static void main(String[] args) {

try {

UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");

} catch (Throwable e) {

e.printStackTrace();

}

EventQueue.invokeLater(new Runnable() {

public void run() {

try {

ButtonTest frame=new ButtonTest();

frame.setVisible(true);

frame.contentPane.requestFocus();

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

/**

* Create the frame.

*/

public ButtonTest() {

setTitle("普通内部类的简单应用");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(100, 100, 300, 200);

contentPane=new JPanel();

contentPane.setLayout(null);

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

setContentPane(contentPane);

final JButton redButton=new JButton();

redButton.setText("红色");

redButton.setBounds(15, 20, 82, 30);

redButton.addActionListener(new ColorAction(Color.RED));

contentPane.add(redButton);

final JButton greenButton=new JButton();

greenButton.setText("绿色");

greenButton.setBounds(100, 20, 82, 30);

greenButton.addActionListener(new ColorAction(Color.GREEN));

contentPane.add(greenButton);

final JButton blueButton=new JButton();

blueButton.setText("蓝色");

blueButton.setBounds(185, 20, 82, 30);

blueButton.addActionListener(new ColorAction(Color.BLUE));

contentPane.add(blueButton);

}

///在类中的普通内部类

private class ColorAction implements ActionListener {

private Color background;

public ColorAction(Color background) {

this.background=background;

}

public void actionPerformed(ActionEvent e) {

contentPane.setBackground(background);

}

}

}

局部内部类

package edu.test.ch7;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.text.SimpleDateFormat;

import java.util.Date;

import javax.swing.JOptionPane;

import javax.swing.Timer;

public class AlarmClock {

private int delay;

private boolean flag;

public AlarmClock(int delay, boolean flag) {

this.delay=delay;

this.flag=flag;

}

public void start() {

class Printer implements ActionListener {

@Override

public void actionPerformed(ActionEvent e) {

SimpleDateFormat format=new SimpleDateFormat("k:m:s");

String result=format.format(new Date());

System.out.println("当前的时间是：" + result);

if (flag) {

Toolkit.getDefaultToolkit().beep();

}

}

}

new Timer(delay, new Printer()).start();

//启动定时器类就是相当于在设定的频率下执事件

///定时器类javax.swing.Timer就是一个按预定频率触发ActionEvent事件的源组件。

}

public static void main(String[] args) {

AlarmClock clock=new AlarmClock(1000, true);

clock.start();

JOptionPane.showMessageDialog(null, "是否退出？");

System.exit(0);

}

}

匿名内部类

package edu.test.ch7;

import java.awt.BorderLayout;

import java.awt.EventQueue;

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.border.EmptyBorder;

import javax.swing.UIManager;

import javax.swing.JButton;

import java.awt.Font;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JLabel;

import javax.swing.SwingConstants;

import java.awt.GridLayout;

public class ImageViewer extends JFrame {

/**

*

*/

private static final long serialVersionUID=1311689308422117198L;

private JPanel contentPane;

private JLabel label;

/**

* Launch the application.

*/

public static void main(String[] args) {

try {

UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");

} catch (Throwable e) {

e.printStackTrace();

}

EventQueue.invokeLater(new Runnable() {

public void run() {

try {

ImageViewer frame=new ImageViewer();

frame.setVisible(true);

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

/**

* Create the frame.

*/

public ImageViewer() {

setTitle("匿名内部类的简单应用");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(100, 100, 300, 240);

contentPane=new JPanel();

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

contentPane.setLayout(new BorderLayout(0, 0));

setContentPane(contentPane);

JPanel panel=new JPanel();

contentPane.add(panel, BorderLayout.CENTER);

panel.setLayout(new BorderLayout(0, 0));

JPanel buttonPanel=new JPanel();

panel.add(buttonPanel, BorderLayout.NORTH);

JButton button1=new JButton("图片1");

button1.setFont(new Font("微软雅黑", Font.PLAIN, 16));

///这里是匿名内部类的核心代码

button1.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

label.setIcon(new ImageIcon("src/images/1.png"));

}

});

buttonPanel.setLayout(new GridLayout(2, 3, 5, 5));

buttonPanel.add(button1);

JButton button2=new JButton("图片2");

button2.setFont(new Font("微软雅黑", Font.PLAIN, 16));

button2.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

label.setIcon(new ImageIcon("src/images/2.png"));

}

});

buttonPanel.add(button2);

JButton button3=new JButton("图片3");

button3.setFont(new Font("微软雅黑", Font.PLAIN, 16));

button3.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

label.setIcon(new ImageIcon("src/images/3.png"));

}

});

buttonPanel.add(button3);

JButton button4=new JButton("图片4");

button4.setFont(new Font("微软雅黑", Font.PLAIN, 16));

button4.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

label.setIcon(new ImageIcon("src/images/4.png"));

}

});

buttonPanel.add(button4);

JButton button5=new JButton("图片5");

button5.setFont(new Font("微软雅黑", Font.PLAIN, 16));

button5.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

label.setIcon(new ImageIcon("src/images/5.png"));

}

});

buttonPanel.add(button5);

JButton button6=new JButton("图片6");

button6.setFont(new Font("微软雅黑", Font.PLAIN, 16));

button6.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

label.setIcon(new ImageIcon("src/images/6.png"));

}

});

buttonPanel.add(button6);

label=new JLabel("");

label.setHorizontalAlignment(SwingConstants.CENTER);

panel.add(label, BorderLayout.CENTER);

}

}

静态内部类

package edu.test.ch7;

public class MaxMin {

public static class Result {

private double max;

private double min;

public Result(double max, double min) {

this.max=max;

this.min=min;

}

public double getMax() {

return max;

}

public double getMin() {

return min;

}

}

public static Result getResult(double[] array) {

double max=Double.MIN_VALUE;

double min=Double.MAX_VALUE;

for (double i : array) {

if (i > max) {

max=i;

}

if (i < min) {

min=i;

}

}

return new Result(max, min);

}

public static void main(String[] args) {

double[] array=new double[5];

for (int i=0; i < array.length; i++) {

array[i]=100*Math.random();

}

System.out.println("源数组：");

for (int i=0; i < array.length; i++) {

System.out.println(array[i]);

}

System.out.println("最大值：" + MaxMin.getResult(array).getMax());

System.out.println("最小值：" + MaxMin.getResult(array).getMin());

}

}

经验内容仅供参考，如果您需解决具体问题(尤其法律、医学等领域)，建议您详细咨询相关领域专业人士。作者声明：本教程系本人依照真实经历原创，未经许可，谢绝转载。