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Lesson 9Using Java's Boolean, string, and assignment operators
Objective Examine Boolean, string, and assignment operators in Java.

Boolean operators

Java also supports a number of Boolean, string, and assignment operators.
Boolean operators are used to perform logical comparisons, and always result in one of two values: true or false. Following are the most commonly used Boolean operators:
  1. AND: Compares two values and returns true if they are both true
  2. OR: Compares two values and returns true if either of the values are true
  3. Negation: Flips the state of a value
  4. Equal-to: Compares two values for equality
  5. Not-equal-to: Compares two values for inequality

Java Boolean Operators

String operators

There is only one string operator, the concatenation operator (+), which appends a string onto another string. Following is an example of using the concatenation operator:
String nickname = "tough guy";
String message = "Hey there, " + nickname + "!";

The nickname string is effectively placed in the middle of a sentence. This code acts somewhat like a form letter in that you provide a sentence and then plug a name into it.

Assignment operators

Assignment operators all perform some type of operation that results in a value being stored in a variable. The following link contains the most commonly used assignment operators:


prime Application - Exercise

In this exercise, You will create a command-line application to determine whether a number is prime.
prime Application - Exercise