#language random

In JDK 7, you can insert underscores ('_') in between digits to make it more readable!

Example:

// before

123456789

// after

123_456_789

Another interesting thing I learned about Java!:O

When Java evaluates an expression, Java promotes the different types within the expression so that they are all converted to the same type. The rules explained briefly in "Java A Beginner's Guide" by Herber Schildt:

First, all char, byte, and short values are promoted to int. Then, if one operand is a long, the whole expression is promoted to long. If one operand is a float operand, the entire expression is promoted to float. If any of the operands is double, the result is double.

So given this code:

byte byte_var = 10;

byte_var = byte_var * byte_var;

This will create a compile time error. To fix this you have to cast the result of the expression to match the type of the variable it will be assigned to, like this:

I've been studying Java lately and I just learned something weird about it (coming from a C background).

I learned that if-conditions ONLY accept boolean expressions! You might be thinking, "Well duh!". But here's the catch, since it only accepts boolean expressions, an if-condition like this would generate a compile-time error in java (I'm using JDK7):

if (1) {

// some code here

}

This is not valid in Java! :O I'm definitely mind blown *A*.