Java黑皮书课后题第10章：10.3

• 题目
• • 程序
• 代码
• • Test13.java
  • Test13_MyRectangle2D.java
  • 运行
• UML

题目

程序

Test13.java：测试程序
Test13_MyRectangle2D.java：构造程序

代码

Test13.java

public class Test13 {public static void main(String[] args) {Test13_MyRectangle2D r1 = new Test13_MyRectangle2D(2, 2, 5.5, 4.9);System.out.printf("%.2f\n", r1.getArea());System.out.printf("%.2f\n", r1.getPerimeter());System.out.println("=================");System.out.println(r1.contains(3, 3));System.out.println(r1.contains(new Test13_MyRectangle2D(4, 5, 10.5, 3.2)));System.out.println(r1.overlaps(new Test13_MyRectangle2D(3, 5, 2.3, 5.4)));} }

Test13_MyRectangle2D.java

public class Test13_MyRectangle2D {private double x, y;public double getX() {return x;}public void setX(double x) {this.x = x;}public double getY() {return y;}public void setY(double y) {this.y = y;}private double width, height;public double getWidth() {return width;}public void setWidth(double width) {this.width = width;}public double getHeight() {return height;}public void setHeight(double height) {this.height = height;}public Test13_MyRectangle2D(){x = 0;y = 0;width = 1;height = 1;}public Test13_MyRectangle2D(double x, double y, double width, double height){this.x = x;this.y = y;this.width = width;this.height = height;}public double getArea(){return width * height;}public double getPerimeter(){return 2 * (width + height);}public boolean contains(double x, double y){boolean bool1 = false, bool2 = false;if (x > this.x - width / 2 && x < this.x + width / 2)bool1 = true;if (y > this.y - height / 2 && y < this.y + height / 2)bool2 = true;return bool1 && bool2;}public boolean contains(Test13_MyRectangle2D r){return ((Math.abs(x - r.x)) < width / 2) && (Math.abs(y - r.y) < height / 2);}public boolean overlaps(Test13_MyRectangle2D r){return ((Math.abs(x - r.x)) < (width / 2 + r.width / 2)) && (Math.abs(y - r.y) < (height / 2 + r.height / 2));} }

运行

26.95 20.80 ================= true false true

UML

总结

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