Solution (leetcode-in-java 1.23 API)

java.lang.Object
- g0501_0600.s0537_complex_number_multiplication.Solution

```
public class Solution
extends Object
```
537 - Complex Number Multiplication.
Medium

A complex number can be represented as a string on the form "**real**+**imaginary**i" where:
- real is the real part and is an integer in the range [-100, 100].
- imaginary is the imaginary part and is an integer in the range [-100, 100].
- i² == -1.
Given two complex numbers num1 and num2 as strings, return a string of the complex number that represents their multiplications.

Example 1:

Input: num1 = “1+1i”, num2 = “1+1i”

Output: “0+2i”

Explanation: (1 + i) * (1 + i) = 1 + i2 + 2 * i = 2i, and you need convert it to the form of 0+2i.

Example 2:

Input: num1 = “1+-1i”, num2 = “1+-1i”

Output: “0+-2i”

Explanation: (1 - i) * (1 - i) = 1 + i2 - 2 * i = -2i, and you need convert it to the form of 0+-2i.

Constraints:
- num1 and num2 are valid complex numbers.

- Constructor Summary
  
  Constructors
  Constructor Description
  
  Solution()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  String complexNumberMultiply(String num1, String num2)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- Solution
```
public Solution()
```

Method Detail

complexNumberMultiply

public String complexNumberMultiply(String num1,
                                    String num2)