---

一、题1

1.1 题目描述

1.2 代码块

public class Book {

	private String name;
	private int pages;
	
	public String getname()
	{
		return name;
	}
	public void setname(String name)
	{
		this.name=name;
	}
	public int getPages() 
	{
		return pages;
	}
	public void setPages(int pages) 
	{
		this.pages = pages;
	}

	public Book()
	{}
	public Book(String name,int pages)
	{
		this.name = name;
		this.pages=pages;
	}
}

public class BookDemo {

	public static void main(String[] args) 
	{
		Book book = new Book ("Java 8 基础应用与开发",339);
		System.out.println("这本书的名字是：" + book.getname());
		System.out.println("这本书的页码是：" + book.getPages());

	}
}

1.3 运行截图

二、题2

2.1 题目描述

2.2 代码块

public class Point {
    private double x;
    private double y;

    public double getX() {
        return x;
    }

    public double getY() {
        return y;
    }

    public void setX(double x) {
        this.x = x;
    }

    public void setY(double y) {
        this.y = y;
    }
}

import java.util.Scanner;
import static java.lang.Math.*;

public class PointDemo {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入第一个点：");
        double x1 = sc.nextDouble();
        double y1 = sc.nextDouble();
        Point p1 = new Point();
        p1.setX(x1);
        p1.setY(y1);

        System.out.println("请输入第二个点：");
        double x2 = sc.nextDouble();
        double y2 = sc.nextDouble();
        Point p2 = new Point();
        p1.setX(x2);
        p1.setY(y2);

        double ans1 = (Math.pow(p1.getX(),2)- Math.pow(p2.getX(),2))+(Math.pow(p1.getY(),2)- Math.pow(p2.getY(),2));
        double ans2 = Math.sqrt(ans1);
        double ans3 = Math.abs(ans2);
        System.out.println("两点距离是："+ans3);
    }
}

2.3 运行截图