Q1) What does this code do?

// setContentView(R.layout.activity_main);

Q2) Which of these lines causes an error?

String a = "Hello";
String b = " Vinton Cerf";
int c = 55;
a = a + b
c = c + c + 10;
a = a + c;
c = c + a;

Q3) We talked a lot about operators and how different operators can be used together to build complicated expressions. Expressions, at a glance, can sometimes make the code look complicated. However, when looked at closely, they are not as tough as they seem. Usually, it is just a case of splitting the expressions into smaller pieces to work out what is going on. Here is an expression that is more convoluted than anything else you will ever see in this book. As a challenge, can you work out: what will x be?

int x = 10;
int y = 9;
boolean isTrueOrFalse = false;
isTrueOrFalse = (((x <=y)||(x == 10))&&((!isTrueOrFalse) || (isTrueOrFalse)));