辅导Fall Semester、讲解Java编程语言、辅导Rectangle留学生、讲解Java
- 首页 >> Java编程2018-2019 Fall Semester Lab Exercise A
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Assignment4
Design a class named Rectangle. The class contains:
a. Five private data fields [10 points]
x (double) : The x position of the center. In a valid rectangle, the range of
x is in (-10, 10)
y (double) : The y position of the center. In a valid rectangle, the range of
y is in (-10, 10)
width (double) : The width of the rectangle. In a valid rectangle, the range
of width is in [0, 5]
height(double) : The height of the rectangle. In a valid rectangle, the range
of height is in [0, 5]
color (java.awt.Color): The color of rectangle.
b. Design three constructors: [10 points]
1. A constructor with two parameters including x and y
2. A constructor with four parameters including x, y, width and height.
3. A constructor with seven parameters, the first four parameters are double
type, which represent the x, y, width and height of current rectangle,
and the last three parameters are integers, which represent the red, green
and blue value of current color respectively.
If a rectangle has no width and height, in constructor method we need to
set width=1 and height=1 as default value.
If a rectangle has no color, in constructor method we need to set a default
color whose red, green and blue value are all 100.
For the third constructor, if the value of red green and blue are larger
than 255 or smaller than 0, we need to set it as its closest boundary
value.
c. Design the getter and setter method for each private field of Rectangle. [10
points]
d. Design a toString() method, which can return a String value as following
output format. [10 points]
The first test:
public class Test1 {
public static void main(String[] args) {
Rectangle r1=new Rectangle(0,1,2,2,100,150,100);
Rectangle r2=new Rectangle(3,1,3,1,-1,350,100);
Rectangle r3=new Rectangle(2,2);
Rectangle r4=new Rectangle(3,-1,2,2);
System.out.println(r1);
2018-2019 Fall Semester Lab Exercise A
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System.out.println(r2);
System.out.println(r3);
System.out.println(r4);
}
}
e. Design a public method named intersect() with a Rectangle parameter and a
return value (boolean). If the current rectangle is intersected with the
parameter rectangle, it will return true, otherwise it will return false. [10
points]
f. Design a public static method named intersect() with two Rectangle
parameters and a return value (boolean). If two rectangles are intersected, it
will return true, otherwise it will return false. [10 points]
The Second Test:
public class Test2 {
public static void main(String[] args) {
Rectangle r1=new Rectangle(0,0,2,2,100,50,100);
Rectangle r2=new Rectangle(1.5,2,3,1,-1,350,100);
Rectangle r3=new Rectangle(1.6,-1,1,3,50,100,200);
Rectangle r4=new Rectangle(1,1,1,2,180,100,40);
System.out.println(r1.intersect(r2));
System.out.println(r1.intersect(r3));
System.out.println(r1.intersect(r4));
System.out.println(Rectangle.intersect(r3, r4));
}
}
g. Design a public method named isValid() with a return value (boolean). Only
when the range of its width and height are in [0, 5] (0 and 5 are included) and
Centre[0.0,1.0] Shape[2.0,2.0] Color[100,150,100]
Centre[3.0,1.0] Shape[3.0,1.0] Color[0,255,100]
Centre[2.0,2.0] Shape[1.0,1.0] Color[100,100,100]
Centre[3.0,-1.0] Shape[2.0,2.0] Color[100,100,100]
false
false
true
true
2018-2019 Fall Semester Lab Exercise A
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the range of it x and y position are in (-10,10) (-10 and 10 are not included), it
will return true, otherwise it will return false. [10 points]
h. Design a public method named isInBoundary() with a return value (boolean).
If the whole rectangle can be drawn in the screen (-10,10), it will return true,
otherwise it will return false. [10 points]
The third Test:
Rectangle r1=new Rectangle(-2,1,5,5,100,150,200);
Rectangle r2=new Rectangle(9,1,5,5,250,100,40);
System.out.println(r1.isInBoundary());
System.out.println(r2.isInBoundary()); ‘
(The whole rectangle of the blue one can be drawn in the screen, so it is in boundary,
but the orange one is not.)
i. In same package, we create a class named RectangleTest, in which there is a
main method. In main method, we will read several lines as following format.
For each line, we need create an object of Rectangle according to the data in
line. After that, we need to output all valid rectangles, which are not intersect
with the first valid rectangle in the line order. [10 points]
The fourth Test:
Sample input:
2018-2019 Fall Semester Lab Exercise A
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9.27,6.61,3,7.18,209,144,247
3.4,4.0,4.5,4.5,100,100,100
-2.89,7.61,5.57,5.06
8.43,6.66
7.42,0.68,2.07,2.93,78,39,165
6.70,1.54,3.52,3.12
1.14,0.76,2.37,3.07,236,105,137
1.06,-0.80,3.03,2.66,132,120,273
3.01,-9.08,2.76,2.36,138,148,119
-0.51,-4.99,6.42,5.65
-4.36,8.70,3.03,2.63,16,138,221
9.40,2.41,6.47,4.90
Sample output:
j. Design a public method named draw() , in which we need to draw the current
rectangle in screen. We need to make sure that: [10 points]
Only draw the valid rectangle.
The rectangle in screen needs to have its color.
In main method, adding following two statements, just before you using draw
method.
StdDraw.setXscale(-10,10);
StdDraw.setYscale(-10,10);
The fifth Test:
Sample input:
-4.98,-8.00,3.29,1.66
0.17,-8.00,2.37,3.43
4.04,-8.00,1.67,1.77
6.84,-8.00,3.35,3.30,87,9,260
6.84,-4.03,2.20,2.83,200,139,78
6.84,-0.89,3.04,1.97,122,195,14
6.84,2.63
6.84,6.09,2.04,1.80
4.36,6.09
Centre[8.4,6.7] Shape[1.0,1.0] Color[100,100,100]
Centre[7.4,0.7] Shape[2.1,2.9] Color[78,39,165]
Centre[1.1,-0.8] Shape[3.0,2.7] Color[132,120,255]
Centre[3.0,-9.1] Shape[2.8,2.4] Color[138,148,119]
Centre[-4.4,8.7] Shape[3.0,2.6] Color[16,138,221]
2018-2019 Fall SemesterLab Exercise A
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0.64,6.09,3.07,3.25,-10,299,288
-2.28,6.09,2.56,3.22
-5.19,6.09,1.68,2.37,-20,-30,184
-5.19,3.68,3.11,2.34
-5.19,-0.82
-5.19,-4.86,2.67,2.99,129,7,49
Sample output:
Sample input:
-1.96,-8.00,2.99,-2.39,230,119,148
2.80,-8.00
7.23,-8.00,2.44,3.20
7.23,-4.07,2.63,2.04,241,27,267
7.23,0.57,8.84,1.98
7.23,5.91
7.23,9.18,-2.15,2.26
3.26,9.18
1.15,9.18,1.86,2.16,69,204,101
-2.51,9.18,2.52,3.41
-5.18,9.18,-1.02,3.17
2018-2019 Fall Semester
Lab Exercise A
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-6.18,6.75,-2.51,2.22,81,26,176
-7.18,2.01,2.43,2.88,116,85,169
-8.18,-1.42
Sample output:
What tosubmit
1. Please submit three “.java” filesincluding “Rectangle.java”
“RectangleTest.java” and “StdDraw.java”, and makesurethat
those “.java” files have no package information included.
Rectangle.java: It isfor you to create and edit all questions.
RectangleTest.java: It is for you to add necessary code to finish
question i, anddo not remove other code in this file.
StdDraw.java:You cando no change about thisfile, but do not
forgetto remove package information if you added it.
2. Please submit those three files intosakai website before deadline