面向对象案例

/*
 * 键盘
	键盘也可以看做是一个磊
	成员变量:
		品牌
		按键个数
*/
public class Keyboard {
	private String name;
	private int keyCount;
	
	public Keyboard() {}

	public Keyboard(String name, int keyCount) {
		this.name = name;
		this.keyCount = keyCount;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getKeyCount() {
		return keyCount;
	}

	public void setKeyCount(int keyCount) {
		this.keyCount = keyCount;
	}
	
	
}

/*
屏幕
屏幕可以看做是一个类
成员变量:
	品牌
	尺寸

*/
public class Screen {
	private String name;
	private float size;
	
	public Screen() {}

	public Screen(String name, float size) {
		this.name = name;
		this.size = size;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public float getSize() {
		return size;
	}

	public void setSize(float size) {
		this.size = size;
	}
	
}

/*
 * PC电脑类
	成员变量:
		屏幕类对象
		键盘类对象
	成员方法：
		换屏幕
		换键盘
		电脑展示配置
 * 
 * */

//
public class PC {
	private Screen screen;
	private Keyboard keyboard;
	
	public PC() {}

	public PC(Screen screen, Keyboard keyboard) {
		this.screen = screen;
		this.keyboard = keyboard;
	}
	
	public void show() {
		System.out.println("屏幕品牌是" + this.screen.getName() + "，屏幕大小是" + this.screen.getSize());
		System.out.println("键盘品牌是" + this.keyboard.getName() + "，键盘键数是" + this.keyboard.getKeyCount() );
		
	}

	public Screen getScreen() {
		return screen;
	}

	public void setScreen(Screen screen) {
		this.screen = screen;
	}

	public Keyboard getKeyboard() {
		return keyboard;
	}

	public void setKeyboard(Keyboard keyboard) {
		this.keyboard = keyboard;
	}
	
	
}

测试类使用了匿名对象

package com.qfedu.a.computer2;

public class Demo {
	public static void main(String[] args) {
		PC pc = new PC(new Screen("京东方",26.8F), new Keyboard("杂牌",84));
	
		pc.show();
		System.out.println("--------------");
		
		
		// 换键盘
		pc.setKeyboard(new Keyboard("机械键盘",84));
	
		System.out.println(pc.getKeyboard().getName());// 通过“。”的方式可以得到匿名对象的值
		
		pc.show();
		System.out.println("--------------");
		
		//换显示器
		
		pc.setScreen(new Screen("杂牌", 28.8F));
	
		pc.show();
		System.out.println("--------------");
	}
}