Unit 3 Boolean Expressions - 3.1

3.1 Boolean Expressions

Java’s relational operators

• equal to: ==
• not equal to: !=
• less than: <
• greater than: >
• less than or equal to: <=
• greater than or equal to >=

Hack!

int myAge = 15;
int otherAge = 45; 

using these integers, determine weather the following statements are True or False

Strings

popcorn hack

whats wrong with this code? (below)

String myName = "Alisha";

System.out.println(!myName.equals("Anika"));
System.out.println(myName.equals("Alisha"));

true
true

comparison of string objects should be done using String methods, NOT integer methods.

• .equal
• compare to

String myName = "Alisha";
boolean areNamesEqual = myName.equals("Alisha");  

if (areNamesEqual) {
    System.out.println("True");
} else {
    System.out.println("False");
}

homework question

what is the precondition for num?

public class CheckDigit {
    public static int getCheck(int num) {
        if (num >= 1 && num <= 6) {
            return num;
        }
        return -1;
    }

}