[JAVA][Beginning Java 8 Games Development]

Chapter 3 ■ A Java 8 Primer: An Introduction to Java 8 Concepts and Principles
Table 3-5. Java Assignment Operators, What Each Assignment Is Equal to in Code, and a Description of the Operator
Operator Example Description
= C=A+B Basic assignment operator: Assigns value from right-hand operand to
left-hand operand
+= C+=A equals C=C+A ADD assignment operator: Adds right-hand operand to left-hand
operand; puts result in left-hand operand
-= C-=A equals C=C-A SUB assignment operator: Subtracts right-hand operand from left-hand
operand; puts result in left-hand operand
*= C*=A equals C=C*A MULT assignment operator: Multiplies right-hand operand and left-hand
operand; puts result in left-hand operand
/= C/=A equals C=C/A DIV assignment operator: Divides left-hand operand by right-hand
operand; puts result in left-hand operand
%= C%=A equals C=C%A MOD assignment operator: Divides left-hand operand by right-hand
operand; puts remainder in left-hand operand
Finally, you are going to take a look at conditional operators, which also allow you to code powerful game logic.
Java Conditional Operators
The Java language also has a conditional operator that can evaluate a condition and make a variable assignment
for you, based on the resolution of that condition, using only one compact programming construct. The generic Java
programming statement for a conditional operator always uses the following basic format:
Variable = (evaluated expression) ? Set this value if TRUE : Set this value if FALSE ;
So, on the left-hand side of the equals sign, you have the variable, which is going to change (be set), based on
what is on the right-hand side of the equals sign. This conforms to what you have learned thus far.
On the right-hand side of the equals sign, you have an evaluated expression, for instance, “x is equal to 3,”
followed by a question mark and then two numeric values that are separated from each other, using the colon, and,
finally, a semicolon to terminate the conditional operator statement. If you wanted to set a variable y to a value of 25
if x is equal to 3, and to 10 if x is not equal to 3, you would write that conditional operator programming statement by
using the following Java programming logic:
y = (x == 3) ? 25 : 10 ;
Next, you are going to look at Java logic control structures that leverage the operators you just learned about.
Java Conditional Control: Decision Making or Loops
As you have just seen, many of the Java operators can have a fairly complex structure and provide a lot of processing
power, using very few characters of Java programming logic. Java also has several more complicated conditional
control structures, which can automatically make decisions or perform repetitive tasks for you, once you have set
up the conditions for those decisions or task repetitions by coding the Java logic control structure.
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