每天一点Java题（二）

编写一个程序，计算箱子的体积，将每个箱子的高度，宽度和长度参数的值传递给构造方法，计算并显示体积。

答案：

public class Changfangti {
	private double length;
	private double width;
	private double high;
	
	public void setLength(double length) {
		this.length = length;
	}
	public void setWidth(double width) {
		this.width = width;
	}
	public void setHigh(double high) {
		this.high = high;
	}
	public double getLength() {
		return this.length;
	}
	public double getWidth() {
		return this.width;
	}
	public double getHigh() {
		return this.high;
	}

//	public Nine_29_Homework1(double length,double width,double high) {
//		this.width = width;
//		this.length =length;
//		this.high = high;
//	}
	
	public double caiVolume() {
		return this.high*this.length*this.width;
	}
}

public class Changfangti_Test {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Changfangti Volume = new Changfangti(9,6,3);
		System.out.println("长方体的长为：" + Volume.getLength());
		System.out.println("长方体的宽为：" + Volume.getWidth());
		System.out.println("长方体的高为：" + Volume.getHigh());
		System.out.println("长方形的面积为：" + Volume.caiVolume());
		  
		System.out.println("----------------------");
		System.out.println("重新输入长宽：");
		Volume.setLength(8.7);
		Volume.setWidth(6.2);
		Volume.setHigh(4.5);
		System.out.println("长方体的长为：" + Volume.getLength());
		System.out.println("长方体的宽为：" + Volume.getWidth());
		System.out.println("长方体的高为：" + Volume.getHigh());
		System.out.println("长方形的面积为：" + Volume.caiVolume());
	}

}

结果：

编写Point类，有两个属性x,y,一个方法distance（Point p1,Point p2），计算两者之间的距离。

答案：

public class Point {
	private double x;
	private double y;
	public void setX(double x) {
		this.x = x;
	}
	public void setY(double y) {
		this.y = y;
	}
	public double getX() {
		return x;
	}
	public double getY() {
		return y;
	}
	public double distance(double x1,double y1) {
		double dis = Math.sqrt(Math.pow((x1-x), 2) + Math.pow((y1-y), 2));
		return dis;
	}
}

import java.util.Scanner;

public class PointTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Point point = new Point();
		Scanner scanner = new Scanner(System.in);
		System.out.println("请输入两点坐标：");
		double x = scanner.nextDouble();
		double y = scanner.nextDouble();
		double x1 = scanner.nextDouble();
		double y1 = scanner.nextDouble();
		point.setX(x);
		point.setY(y);
		double dis = point.distance(x1, y1);
		System.out.println("点1("+point.getX()+" , "+point.getY()+")与点2("+x1+" , "+ y1+")之间的距离为："+ dis);
	}
}

结果：

public class Circle {
	private double radio;
	public static final double pi = 3.1416;
	public void setRadio(double radio) {
		this.radio = radio;
	}
	public double getRadio(double radio) {
		return radio;
	}
	public Nine_30_Circle(double radio){
		this.radio = radio;
	}
	public void getArea() {
		System.out.println("圆的半径为："+ radio);
		double area = Math.pow(radio, 2)*pi;
		System.out.println("圆的面积为："+area);
	}
	public void getPerimeter() {
		System.out.println("圆的半径为："+ radio);
		double perimeter = 2*radio*pi;
		System.out.println("圆的周长为："+perimeter);
	}
}

import java.util.Scanner;

public class CircleTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner = new Scanner(System.in);
		System.out.println("请输入圆的半径:");
		double radio = scanner.nextDouble();
		Circle circle = new Circle(radio);
		circle.getArea();
		circle.getPerimeter();
		System.out.println("更改圆的半径为：");
		double radio2 = scanner.nextDouble();
		circle.setRadio(radio2);
		circle.getArea();
		circle.getPerimeter();
	}

}

结果：