Java学习－－Interface, inner class, anonymous inner class, lambda实例比较

最新推荐文章于 2024-07-31 20:41:06 发布

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最新推荐文章于 2024-07-31 20:41:06 发布

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分类专栏： Java 文章标签： Java

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本文通过对比分析，展示了如何使用Java接口、内部类、匿名内部类和lambda表达式来实现相同的功能：每秒打印一条消息并显示对话框。详细探讨了各自的应用场景和语法特性。

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通过接口，内部类，匿名内部类，lambda表达式实现一个相同的例子，该例子输出每隔一秒钟输出一条打印语句，同时弹出一个对话窗口，点击OK键，则程序退出。

Interface

TimerTest.java

package timer;

import java.awt.event.ActionListener;

import javax.swing.JOptionPane;
import javax.swing.Timer;

public class TimerTest {
	public static void main(String[] args) {
		ActionListener listener = new TimePrinter();
		Timer t = new Timer(10000, listener);
		t.start();
		JOptionPane.showMessageDialog(null, "Quit program?");
		System.exit(0);
	}
}

TimerPrinter.java

package timer;

import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;

public class TimePrinter implements ActionListener {

	@Override
	public void actionPerformed(ActionEvent arg0) {
		// TODO Auto-generated method stub
		System.out.println("At the tone, the time is " + new Date());
		Toolkit.getDefaultToolkit().beep();
	}

}

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InnerClass

InnerClassTest.java

package innerClass;

import javax.swing.JOptionPane;

public class InnerClassTest {
	public static void main(String[] args) {
		TalkingClock clock = new TalkingClock(1000, true);
		clock.start();
		JOptionPane.showMessageDialog(null, "Quit program?");
		System.exit(0);
	}
}

TalkingClock.java

package innerClass;

import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;

import javax.swing.Timer;

public class TalkingClock {
	private int interval;
	private boolean beep;
	public TalkingClock(int interval, boolean beep) {
		this.interval = interval;
		this.beep = beep;
	}
	public void start() {
		ActionListener listener = new TimePrinter();
		Timer t = new Timer(interval, listener);
		t.start();
	}
	public class TimePrinter implements ActionListener {

		@Override
		public void actionPerformed(ActionEvent arg0) {
			// TODO Auto-generated method stub
			System.out.println("At the tone, the time is "  + new Date());
			if (beep) Toolkit.getDefaultToolkit().beep();
		}
		
	}
}

AnonymousInnerClass

AnonymousInnerClassTest.java

package anonymousInnerClass;

import javax.swing.JOptionPane;

public class AnonymousInnerClassTest {
	public static void main(String[] args) {
		TalkingClock clock = new TalkingClock();
		clock.start(1000, true);
		JOptionPane.showMessageDialog(null, "Quiz program?");
		System.exit(0);
	}
}

TalkingClock.java

package anonymousInnerClass;

import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;

import javax.swing.Timer;

public class TalkingClock {
	public void start(int interval, boolean beep) {
		ActionListener listener = new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				System.out.println("At the tone, the time is " + new Date());
				if (beep) Toolkit.getDefaultToolkit().beep();
			}
		};
		Timer t = new Timer(interval, listener);
		t.start();
	}
}

Lambda

LambdaClockTest.java

package lambdaClock;

import javax.swing.JOptionPane;

public class LambdaClockTest {
	public static void main(String[] args) {
		LambdaClock clock = new LambdaClock();
		clock.start(1000, true);
		JOptionPane.showMessageDialog(null, "Quiz program?");
		System.exit(0);
	}
}

LambdaClock.java

package lambdaClock;

import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;

import javax.swing.Timer;

public class LambdaClock {
	public void start(int interval, boolean beep) {
		Timer t = new Timer(interval, event ->
		{
			System.out.println("At the tone, the time is " + new Date());
			if (beep) Toolkit.getDefaultToolkit().beep();
		});
		t.start();
	}
}

注：Lambda是jdk 1.8新增加的功能，在jdk 1.7中会编译错误。

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