A relational operator compares two values and determines the relationship between them. For example, != returns true if its two operands are unequal. Relational operators are used to test whether two values are equal, whether one value is greater than another, and so forth. The relation operators in Java are: ==, !=, <, >, <=, and >=. The meanings of these operators are:
Use | Returns true if |
op1 > op2 | op1 is greater than op2 |
op1 >= op2 | op1 is greater than or equal to op2 |
op1 < op2 | op1 is less than to op2 |
op1 <= op2 | op1 is less than or equal to op2 |
op1 == op2 | op1 and op2 are equal |
op1 != op2 | op1 and op2 are not equal |
Variables only exist within the structure in which they are defined. For example, if a variable is created within a method, it cannot be accessed outside the method. In addition, a different method can create a variable of the same name which will not conflict with the other variable. A java variable can be thought of
The main use for the above relational operators are in CONDITIONAL phrases The following java program is an example, RelationalProg, that defines three integer numbers and uses the relational operators to compare them.
public class RelationalProg { public static void main(String[] args) { //a few numbers int i = 37; int j = 42; int k = 42; //greater than System.out.println("Greater than..."); System.out.println(" i > j = " + (i > j)); //false System.out.println(" j > i = " + (j > i)); //true System.out.println(" k > j = " + (k > j)); //false //(they are equal) //greater than or equal to System.out.println("Greater than or equal to..."); System.out.println(" i >= j = " + (i >= j)); //false System.out.println(" j >= i = " + (j >= i)); //true System.out.println(" k >= j = " + (k >= j)); //true //less than System.out.println("Less than..."); System.out.println(" i < j = " + (i < j)); //true System.out.println(" i = " + (j < i)); //false System.out.println(" j = " + (k < j)); //false //less than or equal to System.out.println(" j = " + (i <= j)); //true System.out.println(" i = " + (j <= i)); //false System.out.println(" j = " + (k <= j)); //true //equal to System.out.println(" i ="=" j = " + (i == j)); //false System.out.println(" k ="=" j = " + (k == j)); //true //not equal to System.out.println(" j = " + (i != j)); //true System.out.println(" j =" ">
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