java中对象之间的交互

た入场券 2022-06-15 12:57 163阅读 0赞

1.对象之间的联系紧密程度叫耦合，耦合度越高，说明两个对象之间依赖性很强，相互牵扯的。我们理想的模型是对象与对象之间的耦合要尽可能的松，平行的对象要尽量减少直接联系，让更高的对象提供它们之间的通信服务。

public class Main1 {
    	public static void main(String[] args) {
    		java.util.Scanner in = new java.util.Scanner(System.in);
    		Clock clock = new Clock(in.nextInt(), in.nextInt(), in.nextInt());
    		clock.tick();
    		System.out.println(clock);
    		in.close();
    	}
    }
    
    class Clock{
    	private Display hour;
    	private Display minute;
    	private Display second;
    	
    	public Clock(int hour,int minute,int second){
    		this.hour = new Display(24, hour);
    		this.minute = new Display(60, minute);
    		this.second = new Display(60, second);
    	}
    	public void tick(){
    		
    		if(second.increase()){
    			if(minute.increase())
    				hour.increase();
    		}
    	}
    	public String toString(){
    		String s = String.format("%02d:%02d:%02d", hour.getValue(),minute.getValue(),second.getValue());
    		return s;
    	}
    }
    
    class Display{
    	private int value = 0;
    	private int limit = 0;
    	
    	public Display(int limit,int value){
    		this.limit=limit;
    		this.value=value;
    	}
    	
    	public boolean increase(){
    		boolean k = false;
    		value++;
    		if(value==limit){
    			value=0;
    			k = true;
    		}
    		return k;
    	}
    	public int getValue(){
    		return value;
    	}
    }

这是一个有秒计时的数字时钟。每调用tick()函数，秒钟都会加1。