# Java Exercises: Test if circumference of two circles intersect or overlap

## Java Basic: Exercise-224 with Solution

There are two circles C1 with radius r1, central coordinate (x1, y1) and C2 with radius r2 and central coordinate (x2, y2)

Write a Java program to test the followings -

"C2 is in C1" if C2 is in C1

"C1 is in C2" if C1 is in C2

"Circumference of C1 and C2 intersect" if circumference of C1 and C2 intersect, and

"C1 and C2 do not overlap" if C1 and C2 do not overlap.

**Input: **

Input numbers (real numbers) are separated by a space.

**Pictorial Presentation:**

**Sample Solution:**

**Java Code:**

```
import java.util.Scanner;
public class Main
{
public static void main(String arg[])
{
Scanner in=new Scanner(System.in);
System.out.println("Input x1, y1, r1: (numbers are separated by a space)");
double x1 = in.nextDouble(),y1=in.nextDouble(),r1=in.nextDouble();
System.out.println("Input x2, y2, r2: (numbers are separated by a space)");
double x2 = in.nextDouble(),y2=in.nextDouble(),r2=in.nextDouble();
double l = Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
if(l>r1+r2)
System.out.println("Circumference of C1 and C2 intersect");
else if(r1>l+r2)
System.out.println("C2 is in C1");
else if(r2>l+r1)
System.out.println("C1 is in C2");
else
System.out.println("C1 and C2 do not overlap");
}
}
```

Sample Output:

Input x1, y1, r1: (numbers are separated by a space) 5 6 8 7 Input x2, y2, r2: (numbers are separated by a space) 8 9 5 4 C1 and C2 do not overlap

**Flowchart: **

**Java Code Editor:**

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**What is the difficulty level of this exercise?**

## Java: Tips of the Day

** Count the number of occurrences of a char in a String:**

int count = StringUtils.countMatches("a.b.c.d", ".");

Ref: https://bit.ly/2OTy6sG

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