Is it legal: String x = "Hello"; int y = 9; y = y + x; : Questions « Operators « SCJP

A. Legal
B. Illegal


public class MainClass{
    public static void main(String[] argv){
        String x = "Hello"; int y = 9; y = y + x;
    
        System.out.println();
    }
}

2.15.Questions
	2.15.1.	Is it legal: String x = "Hello"; int y = 9; if (x == y) {}
	2.15.2.	Answer: int, string and if statement
	2.15.3.	Is it legal: String x = "Hello"; int y = 9; x = x + y;
	2.15.4.	Answer: int, string and plus
	2.15.5.	Is it legal: String x = "Hello"; int y = 9; y = y + x;
	2.15.6.	Answer: string plus int
	2.15.7.	What is -8 % 5?
	2.15.8.	Answer: negative % positive
	2.15.9.	What is 7 % -4?
	2.15.10.	Answer: positive % negative
	2.15.11.	What does the following code do? (if (i != null && i.intValue() == 5))
	2.15.12.	Answer: && and condition statement
	2.15.13.	Is it possible to define a class called MyClass as the following?
	2.15.14.	Answer: equals method definition
	2.15.15.	When a byte is added to a char, what is the type of the result?
	2.15.16.	Answer: byte + char
	2.15.17.	When a short is added to a float, what is the type of the result?
	2.15.18.	Answer: short + float
	2.15.19.	What is the result for i ^ i;
	2.15.20.	Answer: i ^ i
	2.15.21.	Which of the following operations might throw an ArithmeticException(shifting)?
	2.15.22.	Answer: shifting and ArithmeticException
	2.15.23.	Which of the following operations might throw an ArithmeticException?
	2.15.24.	Answer: math operator and ArithmeticException
	2.15.25.	What is the return type of the instanceof operator?
	2.15.26.	Answer: instanceof operator and return type