Write a class called Line that represents a line segment between two Points. Your Line objects should have the following methods: public Line(Point p1, Point p2) Constructs a new line that contains the given two points. public Point getP1() Returns this line's first endpoint. public Point getP2() Returns this line's second endpoint. public String toString() Returns a string representation of this line, such as "[(22, 3), (4, 7)]"
We can draw lines by using Java Swing. Below is the full example.
Explanation:
Explanation of Below code is in comment, line starts with //.
import java.awt.*;
import javax.swing.*;
//Creating Point class which will hold point data
class Point {
public int x;
public int y;
}
//MyCanvas is the class used to draw the line
class MyCanvas extends JComponent {
//Declaring 2 points variable
Point p1;
Point p2;
// Creating Getter and Setter for above 2 variables
public Point getP1() {
return p1;
}
public void setP1(Point p1) {
this.p1 = p1;
}
public Point getP2() {
return p2;
}
public void setP2(Point p2) {
this.p2 = p2;
}
//When canvas load, it will call this method and draw a line
public void paint(Graphics g)
{
// draw and display the line
g.drawLine(p1.x, p1.y, p2.x, p2.y);
}
//toString method to show the points data
@Override
public String toString() {
return "[(" +
p1.x+","+p1.y+")," +
"("+p2.x+","+p2.y+")]";
}
}
//This class will start the program and initialize canvas class
//to draw new line on canvas
public class DrawLine {
public static void main(String[] a)
{
// creating object of JFrame
JFrame window = new JFrame();
// Operation when window closes
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// setting size of window
window.setBounds(30, 30, 200, 200);
// Creating instance of MyCanvas class
MyCanvas canvas = new MyCanvas();
// Adding two points in MyCanvas object with its Setter method
Point p1 = new Point();
p1.x=10;
p1.y=10;
Point p2 = new Point();
p2.x=40;
p2.y=40;
canvas.setP1(p1);
canvas.setP2(p2);
// setting canvas to draw new line
window.getContentPane().add(canvas);
// visibility to true
window.setVisible(true);
//calling toString method to show two point values
System.out.println(canvas.toString());
}
}
import java.awt.Point;
public class Line{
private Point point1, point2;
public Line(Point p1, Point p2){
point1 = p1;
point2 = p2;
}
public Point getP1(){
return point1;
}
public Point getP2(){
return point2;
}
public String toString(){
return "[( The " + point1.x + "," + point1.y + "), (" + point2.x + "," + point2.y +")]";
}
public static void main(String args[]){
Line lineObj = new Line(new Point(7,9), new Point(6,2));
System.out.println(lineObj.toString());
}
}
Explanation:
Declare the points inside the class Line.Initialize the getters and setters method for the class.Define a toString method that returns the information in a formatted manner.Inside the main method, initialize an object with some values.Display the information by calling the toString method.