22-4-23

package d1;

public class A2_1 {
    private int length;
    private int width;

    public int getLength() {
        return length;
    }

    public void setLength(int length) {
        this.length = length;
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }

}package d1;

import java.awt.*;

import static java.lang.Math.PI;


public class A_2 {
    private Point centre;
    private float radius;


    {
        centre=new Point(50,50);
        radius=10.0f;
        //Point在实例代码块中创建Point类型
        //public int a;
    }

    public void setCentre(Point p) {
        this.centre = p;
    }

    public void setRadius(float r) {
        this.radius = r;
    }

    public Point getCentre() {
        return centre;
    }

    public float getRadius() {
        return radius;
    }

    public static double area(int radius){
        return radius*radius*PI;
    }


    public static void main(String[] args) {
        System.out.println(area(10));
    }
}

package d1;
//基本数据类型的最大最小

public class Test1 {


    public static void main(String[] args)
    {
        System.out.println("Byte最小 " + Byte.MAX_VALUE);
        System.out.println("Byte最大 = " + Byte.MIN_VALUE);

        System.out.println("Short最小 " + Short.MAX_VALUE);
        System.out.println("Short最大 = " + Short.MIN_VALUE);

        System.out.println("int最小 " + Integer.MIN_VALUE);
        System.out.println("int最大 = " + Integer.MAX_VALUE);

        System.out.println("Long.MIN_VALUE = " + Long.MIN_VALUE);
        System.out.println("Long.MAX_VALUE = " + Long.MAX_VALUE);



        System.out.println("Float.MIN_VALUE = " + Float.MIN_VALUE);
        System.out.println("Float.MIN_NORMAL = " + Float.MIN_NORMAL);
        System.out.println("Float.MAX_VALUE = " + Float.MAX_VALUE);

        System.out.println("Double.MAX_VALUE = " + Double.MAX_VALUE);
        System.out.println("Double.MIN_VALUE = " + Double.MIN_VALUE);
    }
}

package d1;

import java.util.Random;

public class Test51 {
    public static void main(String[] args) {
        Random r=new Random();
        System.out.print("[");
        for (int i = 0; i < 10; i++) {
            int a =r.nextInt(100);
            System.out.print(a+",");
        }
        System.out.print("]");


    }
}

package d1;

import java.util.Random;
import java.util.Scanner;

//猜数字  学习随机数怎么写和Scanner类的使用 和判断语句
public class Test52 {
    public static void main(String[] args) {
//1.随机生成一个数字并保存
        Random r=new Random();
        int a=r.nextInt(101);
        //2.每次键盘录入一个数字 Scanner
        while (true) {
            Scanner sc=new Scanner(System.in);
            System.out.println("输入猜的数字");
            int guess=sc.nextInt();

            //3 进行if else 判断
            if(guess>a){
                System.out.println("大了");
            }
            else if(guess