第七次实验课代码

添加C04~C07

C05 Extends/C05 Extends.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

C05 Extends/src/shape/Circle.java

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+package shape;
+import java.awt.*;
+
+public class Circle extends Shape {
+    private int radius;
+
+    @Override
+    public double getArea(){
+        return Math.PI*radius*radius;
+    }
+
+    @Override
+    public double getPerimeter(){
+        return 2*Math.PI*radius;
+    }
+    @Override
+    public void draw(Graphics g) {
+        g.setColor(color);
+        // 绘制圆形
+        g.fillOval(x - radius, y - radius, radius * 2, radius * 2);
+
+        // 绘制信息
+        g.setColor(Color.BLACK);
+        g.drawString(String.format("面积: %.2f", getArea()), x + radius + 5, y);
+        g.drawString(String.format("周长: %.2f", getPerimeter()), x + radius + 5, y + 15);
+    }
+
+    public Circle(){
+        this(Color.RED,100,100,50);
+    }
+    public Circle(Color color,int x,int y,int radius){
+        super(color,x,y);
+        this.radius=radius;
+    }
+}

C05 Extends/src/shape/Rectangle.java

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+package shape;
+import java.awt.*;
+
+public class Rectangle extends Shape {
+    private int width,height;
+    public Rectangle() {
+        super();
+    }
+     public Rectangle(Color color, int x, int y, int width, int height) {
+        super(color, x, y);
+        this.width = width;
+        this.height = height;
+    }
+}

C05 Extends/src/shape/Shape.java

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+package shape;
+import java.awt.*;
+
+public class Shape {
+    protected Color color;
+    protected int x,y;
+
+    public void setColor(Color color) {
+        this.color = color;
+    }
+    public Color getColor() {
+        return color;
+    }
+    public double getArea(){
+        return x*y;
+    }
+
+    public void setX(int x){
+        this.x=x;
+    }
+    public int getX(){
+        return x;
+    }
+
+    public void setY(int y){
+        this.y=y;
+    }
+    public int getY(){
+        return y;
+    }
+
+    public double getPerimeter(){
+        return x*y;
+    }
+
+    public void move(int dx,int dy){
+        x += dx;
+        y += dy;
+    }
+
+    public void draw(Graphics g){
+        g.setColor(color);
+        g.fillRect(x,y,1,1);
+    }
+
+    Shape(){}
+    Shape(Color color,int x,int y){
+        this.color=color;
+        this.x=x;
+        this.y=y;
+    }
+}

C05 Extends/src/test/ShapeDrawerTest.java

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+package test;
+
+import javax.swing.*;
+import java.awt.*;
+import shape.Circle;
+
+public class ShapeDrawerTest extends JFrame {
+    /*******请在下面添加**************/
+    // 【任务1】定义一个包含5个元素的圆形数组
+    Circle[] circles = new Circle[5];
+    /*******请在上面添加**************/
+
+    // 初始化图形
+    private void initShapes() {
+        /*******请在下面添加**************/
+        // 【任务2】采用无参构造添加一个红色，坐标为(100,100)，半径为50的圆形，并加入对应数组
+        circles[0] = new Circle();
+        // 【任务3】采用有参构造添加一个黄色，坐标为(150,300)，半径为70的圆形，并加入对应数组
+        circles[1] = new Circle(Color.YELLOW, 150, 300, 70);
+        circles[2] = new Circle();
+        circles[3] = new Circle();
+        circles[4] = new Circle();
+        /*******请在上面添加**************/
+    }
+
+    // 重写绘制方法
+    @Override
+    public void paint(Graphics g) {
+        super.paint(g);
+        /*******请在下面添加**************/
+        // 绘制所有图形
+        // 【任务4】采用增强型for循环绘制所有图形
+        for (Circle circle : circles) {
+            circle.draw(g);
+        }
+        /*******请在上面添加**************/
+        // 绘制标题
+        g.setColor(Color.BLACK);
+        g.drawString("Java继承图形绘制示例", 300, 30);
+    }
+    public ShapeDrawerTest() {
+        // 初始化窗口
+        setTitle("图形绘制程序");
+        setSize(800, 600);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setLocationRelativeTo(null);
+
+        // 创建各种图形对象
+        initShapes();
+    }
+    public static void main(String[] args) {
+        new ShapeDrawerTest().setVisible(true);
+    }
+}
+