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Relational operators return Boolean values in relationship to the evaluation of their left and right operands. The six most common relational operators are on the exam. Four of them equate to the greater than and less than comparisons. Two are strictly related to equality as we will discuss at the end of this section.
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Basic Relational Operators
n < less than operator n <= less than or equal to operator n > greater than operator n >= greater than or equal to operator
The less than, less than or equal to, greater than, and greater than or equal to operators are used to compare integers, floating points, and characters. When the expression used with the relational operators is true, the Boolean value of true is returned; otherwise, false is returned.
/* returns boolean b1 /* returns boolean b2 true as 1 is less than 2 */ = 1 < 2; false as 3 is not less than 2 */ = 3 < 2;
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Programming with Java Operators and Strings
/* returns boolean b3 /* returns boolean b4 /* returns boolean b5 /* returns boolean b6 /* returns boolean b7 /* returns boolean b8
true as 3 is greater than 2 */ = 3 > 2; false as 1 is not greater than 2 */ = 1 > 2; true as 2 is less than or equal to 2 */ = 2 <= 2; false as 3 is not less than or equal to 2 */ = 3 <= 2; true as 3 is greater than or equal to 3 */ = 3 >= 3; false as 2 is not greater than or equal to 3 */ = 2 >= 3;
So far we ve only examined the relationship of int primitives. Let s take a look at the various ways char primitives can be evaluated with relational operators, specifically the less than operator for these examples. Remember that characters (that is, char primitives) accept integers (within the valid 16-bit unsigned range), hexadecimal, octal, and character literals. Each literal in the following examples represents the letters A and B. The left operands are character A and the right operands are character B. Since each expression is essentially the same, they all evaluate to true.
boolean b1 boolean b2 boolean b3 boolean b4 boolean b5 boolean b6 sequences boolean b7 = = = = = = 'A' < 'B'; // Character literals '\u0041' < '\u0042'; // Unicode literals 0x0041 < 0x0042; // Hexadecimal literals 65 < 66; // Integer literals that fit in a char 0101 < 0102; //Octal literals '\101' < '\102'; //Octal literals with escape
= 'A' < 0102; // Character and Octal literals
As mentioned, you can also test the relationship between floating points. The following are a few examples.
boolean boolean boolean boolean boolean casts boolean boolean boolean boolean b1 b2 b3 b4 b5 b6 b7 b8 b9 = = = = = = = = = 9.00D < 9.50D; // Floating points with D postfixes 9.00d < 9.50d; // Floating points with d postfixes 9.00F < 9.50F; // Floating points with F postfixes 9.0f < 9.50f; // Floating points with f postfixes (double)9 < (double)10; // Integers with explicit (float)9 < (float)10; // Integers with explicit casts 9 < 10; // Integers that fit into floating points (9d < 10f); (float)11 < 12;
Understanding Fundamental Operators
Equality Operators
Relational operators that directly compare the equality of primitives (numbers, characters, Booleans) and object reference variables are considered equality operators.
n == equal to operator n != not equal to operator
Comparing primitives of the same type is straightforward. If the right and left operands of the equal to operator are equal, the Boolean value of true is returned, otherwise false is returned. If the right and left operands of the not equal to operator are not equal, the Boolean value of true is returned, otherwise false is returned. The following code has examples that compare all eight primitives to values of the same type.
int value = 12; /* boolean comparison, prints true */ System.out.println(true == true); /* char comparison, prints false */ System.out.println('a' != 'a'); /* byte comparison, prints true */ System.out.println((byte)value == (byte)value); /* short comparison, prints false */ System.out.println((short)value != (short)value); /* integer comparison, prints true */ System.out.println(value == value); /* float comparison, prints true */ System.out.println(12F == 12f); /* double comparison, prints false */ System.out.println(12D != 12d);
Reference values of objects can also be compared. Consider the following code:
Object a = new Object(); Object b = new Object(); Object c = b;
The reference variables are a, b, and c. As shown, reference variables a and b are unique. Reference variable c refers to reference variable b, so for equality purposes, they are the same.
/* Prints false, different references */ System.out.println(a == b); /* Prints false, different references */ System.out.println(a == c); /* Prints true, same references */ System.out.println(b == c);
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