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Exam Objective 4.5 Given an algorithm as pseudo-code, develop code that correctly applies the appropriate operators, including assignment operators (limited to: =, +=, -=), arithmetic operators (limited to: +, -, *, /, %, ++, --), relational operators (limited to: <, <=, >, >=, ==, !=), logical operators (limited to: !, &&, ||), to produce a desired result. Also, write code that determines the equality of two objects or two primitives. Java operators are used to return a result from an expression using one, two, or three operands. Operands are the values placed to the right or left side of the operators. Prefix/postfix-increment/decrement operators use one operand. The conditional ternary operator ( :) uses three operands. All other operators use two operands. Examples of operand use are shown in Figure 3-1. Note that the result of evaluating operands is typically a primitive value. Table 3-1 represents all of the operators you may see on the exam. The precedence defines the order of which operator will be evaluated when several are included in an expression. The association defines which operand will be used (or evaluated) first. The Java operators that are not on the exam are the bitwise complement (~), left shift (<<), right shift (>>), unsigned right shift (>>>), boolean AND (&), bitwise AND (&), boolean exclusive OR (^), bitwise OR(^), boolean OR (|), bitwise OR(|), conditional ternary operator ( :), and the following compound assignment operators (*=, /=, %=, &=, ^=, |=, <<=, >>=, >>>=).
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goldCoins = goldCoins ++; (operand1) One Operand
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totalCoins = silverCoins + GoldCoins; (operand1) (operand2)
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int pirateShares = (isCaptain == true) TEN_SHARES : FIVE_SHARES; (operand1) (operand2) (operand3)
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Three Operands
The following topics will be covered in these pages:
n Assignment operators n Arithmetic operators n Relational operators n Logical operators
TABlE 3-1
Java Operators on the SCJA Exam
Relative Precedence
1 2 2 3 4 5 6 6 7 8 9
Operator
++,-++,-! *,/,% +,<, <=, >, >= ==, != ==, != && || =, +=, -=
Description
Postfix increment, postfix decrement Prefix increment, prefix decrement Boolean NOT Multiplication, division, remainder (modulus) Addition, subtraction Less than, less than or equal to, greater than, greater than or equal to Value equality and inequality Reference equality and inequality Conditional AND Conditional OR Assignment and compound assignments (addition and subtraction)
Operator Type
Arithmetic Arithmetic Logical Arithmetic Arithmetic Relational Relational Relational Logical Logical Assignment
Association
Right to left Right to left Right to left Left to right Left to right Left to right Left to right Left to right Left to right Left to right Right to left
3:
Programming with Java Operators and Strings
Assignment Operators
Assignment operators are used to assign values to variables.
n = assignment operator
The assignment operator by itself is the equal sign (=). 2 discusses assignment statements, and 4 discusses the assignment of literals into primitive data types and the creation of reference type variables. At its simplest, the assignment operators move valid literals into variables or cause compiler errors when the literals are not valid. The following are valid assignment statements using the assignment operator.
boolean hasTreasureChestKey = true; byte shipmates = 20; PirateShip ship = new PirateShip();
The following are invalid assignments and will cause compiler errors:
/* Invalid literal, TRUE must be lower case */ boolean hasTreasureChestKey = TRUE; /* Invalid literal, byte value cannot exceed 127 */ byte shipmates = 500; /* Invalid constructor */ PirateShip ship = new PirateShip(UNEXPECTED_ARG);
Compound Assignment Operators
A variety of compound assignment operators exist. The exam only covers the addition and subtraction compound assignment operators.
n += assignment by addition operator n -= assignment by subtraction operator
Consider the following two assignment statements:
goldCoins = goldCoins + 99; pirateShips = pirateShips - 1;
The following two statements (with the same meaning and results as earlier) are written with compound assignment operators.
goldCoins += 99; pirateShips -= 1;
Understanding Fundamental Operators
While the use of compound assignment operators cuts down on keystrokes, it is generally good practice to use the former longhand approach since the code is clearly more readable.
It is common to represent assignments in pseudo-code with the colon and equal sign characters (for example, A := 20). Notice that := looks strikingly familiar to +=, -=, and other Java assignment operators such as *=, /=, and %=. Be aware though that the pseudo-code assignment representation (:=) is not a Java assignment operator, and if you see it in any Java code, it will not compile.
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