Slide 2 - Boolean Operators

Slide 3 - Boolean Operators

• To test more complex conditions in an if or if-else statement, we can use one of the three Boolean operators:
• && (and) – true if all parts are true
• || (or) – true if any parts are true
• ! (not) – true if condition is false

Slide 4 - Boolean Operators

• Some examples:
• true && true
• true && false
• (3 > 5) && (9 < 10)
• int x = 10;
• (x > 0) && (x != 20)
• (x >= 5) && (x < 10)

Slide 5 - Boolean Operators

• Some examples:
• true && true
• true && false
• (3 > 5) && (9 < 10)
• int x = 10;
• (x > 0) && (x != 20)
• (x >= 5) && (x < 10)
• true || false
• false || false
• (7 == 9) || (12 > 20)
• int y = -5;
• (y > 10) || (y < 0)
• (y > 0) || (y == -2)

Slide 6 - Boolean Operators

• Some examples:
• true && true
• true && false
• (3 > 5) && (9 < 10)
• int x = 10;
• (x > 0) && (x != 20)
• (x >= 5) && (x < 10)
• true || false
• false || false
• (7 == 9) || (12 > 20)
• int y = -5;
• (y > 10) || (y < 0)
• (y > 0) || (y == -2)
• !true
• !false
• !(3 < 2)
• int z = 7;
• !(z > 5)
• !(z <= 0)

Slide 7 - Boolean Operators

• Some examples:
• true && true
• true && false
• (3 > 5) && (9 < 10)
• int x = 10;
• (x > 0) && (x != 20)
• (x >= 5) && (x < 10)
• true || false
• false || false
• (7 == 9) || (12 > 20)
• int y = -5;
• (y > 10) || (y < 0)
• (y > 0) || (y == -2)
• !true
• !false
• !(3 < 2)
• int z = 7;
• !(z > 5)
• !(z <= 0)
• !(true && false)
• false || (true && true)
• (5 > 0) && !(7 < 0)
• int a = 4, b = 5;
• (a > 0) && (a != b)

Slide 8 - The Boolean operators can be used like any other expression, including in an if or if-else.

• Boolean Operators
• if (3 < 5 && 10 > 0) {
• System.out.println("Yes");
• }
• if (-4 < -8 || -9 < -3) {
• System.out.println("OK!");
• }
• int x = 7;
• if (x == 3 || x == 5) {
• x++;
• } else {
• x--;
• }
• System.out.println(x);
• String str = "Hello";
• if (!(str.length() > 8)) {
• System.out.println("Short");
• }