仔细阅读以下所给的代码,完善Point类,在Point类中覆盖Object的toString()和equals()方法，使得编译执行主类Test输出如下结果: public class Test{ public static void main(String[] args){ Point pt1=new Point(12,24,36); Point pt2=new Point(12,24,36); System.out.println("pt1:"+pt1); System.out.println("pt1.equals(pt2):"+ pt1.equals(pt2)); } } class Point{ private double x; private double y; private double z; public Point(){} public Point(double x,double y,double z){ this.x=x; this.y=y; this.z=z; } public double getX(){return this.x;} public void setX(double x){this.x=x;} public double getY(){return this.y;} public void setY(double y){this.y=y;} }

完善后的代码如下：

public class Test{
	public static void main(String[] args){
		Point pt1=new Point(12,24,36);
		Point pt2=new Point(12,24,36);
		System.out.println("pt1:"+pt1);
		System.out.println("pt1.equals(pt2):"+ pt1.equals(pt2));
    }
}

class Point{
	private double x;
	private double y;
	private double z;
	
	public Point(){}
	
	public Point(double x,double y,double z){
		this.x=x;
		this.y=y;
		this.z=z;
	}
	
	public double getX(){return this.x;}
	public void setX(double x){this.x=x;}
	
	public double getY(){return this.y;}
	public void setY(double y){this.y=y;}
	
	public double getZ(){return this.z;}
	public void setZ(double z){this.z=z;}
	
	@Override
	public String toString() {
		return "Point [x=" + x + ", y=" + y + ", z=" + z + "]";
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Point other = (Point) obj;
		if (Double.doubleToLongBits(x) != Double.doubleToLongBits(other.x))
			return false;
		if (Double.doubleToLongBits(y) != Double.doubleToLongBits(other.y))
			return false;
		if (Double.doubleToLongBits(z) != Double.doubleToLongBits(other.z))
			return false;
		return true;
	}
}

输出结果为：

pt1:Point [x=12.0, y=24.0, z=36.0]
pt1.equals(pt2):true

其中，Point类中覆盖了Object的toString()和equals()方法，toString()方法返回一个字符串，表示该点的x、y、z坐标值，equals()方法判断两个Point对象是否相等，如果它们的x、y、z坐标值都相等，则返回true，否则返回false。在测试主类Test中，创建了两个Point对象pt1和pt2，它们的坐标值都相等，因此调用equals()方法返回true。在输出pt1时，调用了Point类的toString()方法，返回了该点的x、y、z坐标值。