3. Boolean Expressions and If Statements

This unit introduces If-statements, which allow you to conditionally execute a block of code depending on whether a Boolean expression is true or false.

• 3.1. Boolean Expressions
  • 3.1.1. Testing Equality (==)
  • 3.1.2. Relational Operators (<, >)
  • 3.1.3. Testing with mod (%)
  • 3.1.4. Negation !
  • 3.1.5. Programming Challenge : Prime Numbers
  • 3.1.6. Summary
• 3.2. If Statements and Control Flow
  • 3.2.1. Relational Operators in If Statements
  • 3.2.2. Conditional Control Flow
  • 3.2.3. Common Errors with If Statements
  • 3.2.4. Programming Challenge : Magic 8 Ball
  • 3.2.5. Summary
• 3.3. Two-way Selection: if-else Statements
  • 3.3.1. Nested Ifs and Dangling Else
  • 3.3.2. Programming Challenge : 20 Questions
  • 3.3.3. Summary
• 3.4. Multi-Selection: else-if Statements
  • 3.4.1. Programming Challenge : Adventure
  • 3.4.2. Summary
• 3.5. Compound Boolean Expressions
  • 3.5.1. And (&&), Or (||), and Not (!)
  • 3.5.2. Truth Tables
  • 3.5.3. Short Circuit Evaluation
  • 3.5.4. Programming Challenge : Truth Tables
  • 3.5.5. Summary
• 3.6. Equivalent Boolean Expressions (De Morgan’s Laws)
  • 3.6.1. Programming Challenge : Truth Tables
  • 3.6.2. Summary
• 3.7. Comparing Objects
  • 3.7.1. String Equality
  • 3.7.2. Using new with Strings
  • 3.7.3. Programming Challenge : Tracing Code
  • 3.7.4. Summary
• 3.8. Unit 3 - Summary
  • 3.8.1. Vocabulary Practice
  • 3.8.2. Concept Summary
  • 3.8.3. Java Keyword Summary
  • 3.8.4. Common Mistakes
• 3.9. Mixed Up Code Practice
• 3.10. Coding Practice
• 3.11. Multiple Choice Exercises
  • 3.11.1. Easier Multiple Choice Questions
  • 3.11.2. Medium Multiple Choice Questions
  • 3.11.3. Hard Multiple Choice Questions
• 3.12. Lesson Workspace

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