# javaee-test-oop

**Repository Path**: suruixin123/javaee-test-oop

## Basic Information

- **Project Name**: javaee-test-oop
- **Description**: OOP回顾
- **Primary Language**: Java
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 159
- **Created**: 2025-03-01
- **Last Updated**: 2025-03-01

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# 面向对象程序设计回顾
## 一、类的定义与使用
### 1. 声明Point类
	public class Point {
		public int x;
		public int y;

		public Point() {
		}

		public Point(int x, int y) {
			this.x = x;
			this.y = y;
		}

		public Point(Point p){
			this.x = p.x;
			this.y = p.y;
		}

		public int getX() {
			return x;
		}

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

		public int getY() {
			return y;
		}

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

### 2. 声明Rectangle类
	public class Rectangle{
		private Point ptTopLeft;
		private Point ptTopRight;
		private int width;
		private int height;

		public Rectangle() {
		}
		public Rectangle(Point topLeft, int height, int width) {
			this.ptTopLeft = topLeft;
			this.ptTopRight = new Point(topLeft.getX() + width, topLeft.getY());
			this.height = height;
			this.width = width;
		}
		public double perimeter() {
			return 2 * (this.height + this.width);
		}
		public double area() {
			return this.height * this.width;
		}
		public void draw() {
			System.out.println("绘制宽为："+width+" 高为:"+height+"的矩形");
		}
	}

### 3. 测试Rectangle类
## 二、	类与接口
### 1. 声明IShape接口，添加三个接口方法
	public interface IShape {
		double perimeter();
		double area();
		void draw();
	}

### 2. 声明Circle类实现IShape接口
	public class Circle implements IShape{
		private Point ptCenter;
		private int r;

		public Circle(Point center, int r) {
			this.ptCenter = center;
			this.r = r;
		}
		@Override
		public double perimeter() {
			return 2*Math.PI*r;
		}

		@Override
		public double area() {
			return Math.PI*r*r;
		}

		@Override
		public void draw() {
			System.out.println("以圆心坐标x:"+ptCenter.getX()+" y:"+ptCenter.getY()+" 半径为"+r+"绘制圆");
		}
	}

### 3. 声明Triangle类实现IShape接口
	public class Triangle implements IShape{
		private Point ptA;
		private Point ptB;
		private Point ptC;
		private double edgeA;
		private double edgeB;
		private double edgeC;

		public Triangle(Point ptA, Point ptB, Point ptC) {
			this.ptA = ptA;
			this.ptB = ptB;
			this.ptC = ptC;
		}

		@Override
		public double perimeter() {
			return edgeA + edgeB + edgeC;
		}

		@Override
		public double area() {
			double s = perimeter() / 2;
			return Math.sqrt(s * (s - edgeA) * (s - edgeB) * (s - edgeC));
		}

		@Override
		public void draw() {
			System.out.println("以坐标点A、B、C： (" + ptA.getX() + ", " + ptA.getY() + "), (" + ptB.getX() + ", " + ptB.getY() + "), (" + ptC.getX() + ", " + ptC.getY() + ")绘制三角形");
		}
	}


### 4. 改造一中的Rectangle类，使之实现IShape接口
	public class Rectangle implements IShape{
		private Point ptTopLeft;
		private Point ptTopRight;
		private int width;
		private int height;

		public Rectangle() {
		}
		public Rectangle(Point topLeft, int height, int width) {
			this.ptTopLeft = topLeft;
			this.ptTopRight = new Point(topLeft.getX() + width, topLeft.getY());
			this.height = height;
			this.width = width;
		}
		@Override
		public double perimeter() {
			return 2 * (this.height + this.width);
		}
		@Override
		public double area() {
			return this.height * this.width;
		}
		@Override
		public void draw() {
			System.out.println("绘制宽为："+width+" 高为:"+height+"的矩形");
		}
	}



### 5. 声明ShapeManager类
	import java.util.ArrayList;
	import java.util.List;

	public class ShapeManager {
		private List<IShape> shapes=new ArrayList<>();

		public void addShape(IShape shape){
			shapes.add(shape);
		}
		public void delShape(IShape shape){
			shapes.remove(shape);
		}
		public void drawShapes(){
			for(IShape shape : shapes){
				shape.draw();
			}
		}
	}

### 6. 测试代码
```java
public static void Main(String[] args){
	ShapeManager shapeManager=new ShapeManager();
	Rectangle rect=new Rectangle(new Point(10,10),100,200);
	Triangle tri=new Triangle(new Point(0,10),new Point(50,50),new Point(150,0));
	Circle cir=new Circle(new Point(100,100),100);
	shapeManager.addShape(rect);
	shapeManager.addShape(tri);
	shapeManager.addShape(cir);
	shapeManager.drawShapes();
	shapeManager.delShape(rect);
	shapeManager.drawShapes();
}
```