bzu-java(二)

public class Vehicle{
	private int speed;
	private int size;
    private void move(){};
	public void speedUp(){
		this.speed++;
	}
	public void speedDown(){
		this.speed--;
	}
	public void setSpeed(int speed){
		this.speed=speed;
	}	
	public void setSize(int size){
		this.size=size;
	}
	public static void main(String args[]){
		Vehicle vehicle=new Vehicle();
		vehicle.setSize(100);
		vehicle.setSpeed(100);
		System.out.println(vehicle.size);
		System.out.println(vehicle.speed);
		vehicle.speedUp();
		System.out.println(vehicle.speed);
		vehicle.speedDown();
		System.out.println(vehicle.speed);
	}
}

import java.util.Date;
import java.text.SimpleDateFormat;
import java.util.Calendar; 
public class test2{
	public static void main(String args[]){
		SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
        System.out.println(df.format(new Date()));
		Calendar c = Calendar.getInstance();
		int hour = c.get(Calendar.HOUR_OF_DAY); 
		int minute = c.get(Calendar.MINUTE); 
		int second = c.get(Calendar.SECOND); 
		System.out.println( +hour + ":" +minute + ":" + second); 
}
}

class Point{
	private double x;
	private double y;
	public double getDis(Point point){
	    return Math.sqrt(Math.sqrt((point.x-this.x)*(point.x-this.x)+(point.y-this.y)*(point.y-this.y)));
	}
	
	Point(double x,double y){
		this.x=x;
		this.y=y;
	}
}
public class Circle{
	private Point point;
	private float r;
	Circle(){
		this.point=new Point(1,5);
		this.r=4;
	}
	Circle(double x,double y,float r){
		this.point=new Point(x,y);
		this.r=r;
	}
	public Point getPoint(){
		return this.point;
	}
	public float getR(){
		return this.r;
	}
	public static void main(String args[]){
		Circle c1=new Circle();
		Circle c2=new Circle(1,5,100);
		if((c1.getPoint().getDis(c2.getPoint()))<(c1.getR()+c2.getR()))
			System.out.println("重叠");
		else System.out.println("不重叠");
	}
}

public class Phone{
	private SIM sim;
	Phone(SIM sim){
		this.sim=sim;
	}
	public void setSIM(SIM sim){
		this.sim=sim;
	}
	public int getId(){
		return this.sim.getID();
	}
	public static void main(String args[]){
		SIM sim1=new SIM(1);
		SIM sim2=new SIM(2);
		Phone phone=new Phone(sim1);
		System.out.println(phone.getId());
		phone.setSIM(sim2);
		System.out.println(phone.getId());
		
	}
}
class SIM{
	private int id;
	SIM(int id){
		this.id=id;
	}
	public int getID(){
		return this.id;
	}
}

public class test{
	public static void main(String args[]){
		CPU cpu=new CPU();
		cpu.setSpeed(2200);
		HardDisk disk=new HardDisk();
		disk.setAmount(200);
		PC pc=new PC();
		pc.setCPU(cpu);
		pc.setHardDisk(disk);
		pc.show();
	}

}
class CPU{
	private int speed;
	public void setSpeed(int speed){
		this.speed=speed;
	}
	public int getSpeed(){
		return speed;
	}
}
class HardDisk{
	private int amount;
	public void setAmount(int amount){
		this.amount=amount;
		
	}
	public int getAmount(){
		return this.amount;	
	}
	
}
class PC{
	private CPU cpu;
	private HardDisk HD;
	public void setCPU(CPU cpu){
		this.cpu=cpu;
	}
	public void setHardDisk(HardDisk HD){
		this.HD=HD;
	}
	public void show(){
		System.out.println(this.cpu.getSpeed()+" "+this.HD.getAmount());
	}
	
}