Java development for beginners 6. Logic operators. Boolean type.
Logical Operators are operators that operate on Boolean values; that is values that are true of false.
| Logical Operator | Java symbols |
| And | && |
| Or | || |
| Not | ! |
Boolean Expressions:
-Boolean is a primitive java data type
-A Boolean expression is an expression that evaluates to either true of false
- true and false are both reserved words in java
- Boolean expressions are made up of comparison and logical operators
- Boolean expressions can be used in the if statements and conditional loops
- Boolean expressions can also be used is assignment statements
The comparison operators compare two values and will evaluate to either true or false
| Comparison | Java symbols |
| less than | < |
| greater than | > |
| equal to | == |
| not equal to | != |
| less than or equal to | <= |
| greater than or equal to | >= |
In the class Tutorial6 we have the code of the example of the video tutorial so you can play with it.
package com.edu4java.tutorial6;
import java.util.Scanner;
public class Tutorial6 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("scan age:");
int age = scanner.nextInt();
// boolean canDrink=(age>=18)&&(age<=60);
boolean canNotDrink=(age<18)||(age>60);
if (canNotDrink) {
System.out.println(" can´t drink");
} else {
System.out.println("can drink");
}
System.out.print("print age: ");
System.out.println(age);
}
}
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