Java Program to Check Whether a Given Point Lies Inside a Rectangle or Not

public class Main
{
     // Driver code 
    public static void main (String[] args) 
    { 
          
        //Rectangle Coordinate A(10,10), B(10,-10), C(-10,-10), D(-10,-10)
        //Point P(0,0)
        //Calling the checkPoint() method
        if (checkPoint(10, 10, 10, -10, -10, -10, -10, 10, 0, 0)) 
            System.out.print("Point lies inside rectangle"); 
        else
            System.out.print("Point does not lie inside rectangle"); 
    } 
    
    //Method to calculate the area of triangle
    static float area(int x1, int y1, int x2,  
                        int y2, int x3, int y3) 
    { 
        return (float)Math.abs((x1 * (y2 - y3) +  
        x2 * (y3 - y1) + x3 * (y1 - y2)) / 2.0); 
    } 
          
    //Method to check whether point P(x, y) 
    //lies inside rectangle ABCD or not.
    static boolean checkPoint(int x1, int y1, int x2, int y2, 
    int x3, int y3, int x4, int y4, int x, int y) 
    { 
          
        // Find area of rectangle ABCD 
        float Area = area(x1, y1, x2, y2, x3, y3)+  
                area(x1, y1, x4, y4, x3, y3); 
      
        // Calculate area of triangle PAB 
        float Area1 = area(x, y, x1, y1, x2, y2); 
      
        // Calculate area of triangle PBC 
        float Area2 = area(x, y, x2, y2, x3, y3); 
      
        // Calculate area of triangle PCD 
        float Area3 = area(x, y, x3, y3, x4, y4); 
      
        // Calculate area of triangle PAD 
        float Area4 = area(x, y, x1, y1, x4, y4); 
      
        // Checking if sum of Area1, Area2, Area3 and Area4  
        // is same with Area or not
        //Returns true if Area == Area1 + Area2 + Area3 + Area4
        // else returns false
        return (Area == Area1 + Area2 + Area3 + Area4); 
    } 
}

Output:

Point lies inside rectangle