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Java

26The int Type: Java's Default Integer
27Declaring and Initializing int Variables
28The long Type: Extended Range Integers
29The L Suffix for long Literals
30The short Type: Small Range Integers
31The byte Type: Single-Byte Integers
32Why int is the Default: Performance and Compatibility
33Integer Overflow: What Happens at the Limits
34Mixing Integer Types in Expressions
35Binary, Octal, and Hexadecimal Integer Literals
36Choosing the Right Integer Type for Your Data
37Common Pitfalls: Integer Division and Truncation
38Introducing Floating-Point Types: float and double
39Declaring and Initializing float and double Variables
40Floating-Point Literals and the f/F Suffix
41Scientific Notation in Floating-Point Literals
42Precision and Range of float vs double
43Floating-Point Arithmetic and Rounding Errors
44Special Values: Infinity, -Infinity, and NaN
45Comparing Floating-Point Numbers Safely
46When to Use double Over float
47Floating-Point Best Practices and Pitfalls
48The char Type: Representing Single Characters
49Character Literals and Escape Sequences
50Unicode Escapes: \uXXXX Notation
51char as a Numeric Type: Arithmetic with Characters
52The boolean Type: true and false
53Declaring and Initializing boolean Variables
54Boolean Expressions and Comparison Results
55Common Mistakes: boolean vs Numeric Types
56Integer Literals: Decimal, Hexadecimal, Octal, and Binary
57Long Literals and the L Suffix
58Floating-Point Literals and the F and D Suffixes
59Scientific Notation for Floating-Point Literals
60Character Literals and Escape Sequences
61String Literals and Escape Characters
62Boolean Literals: true and false
63Underscores in Numeric Literals for Readability
64Rules and Restrictions for Underscores in Literals
65Variable Declaration Syntax
66Uninitialized Variables and Compilation Errors
67Default Values for Fields vs Local Variables
68Declaration and Initialization in One Statement
69Multiple Variable Declaration
70The final Keyword for Variables
71final and Initialization Requirements
72Blank Finals in Constructors
73final Parameters
74Naming Conventions for final Variables
75final vs Immutability
76Widening Conversions: Automatic Type Promotion
77Implicit Widening in Assignments and Expressions
78Narrowing Conversions: Potential Data Loss
79Explicit Cast Syntax: (type) expression
80Truncation in Integer Narrowing Casts
81Precision Loss in Floating-Point to Integer Casts
82Casting Between char and Integer Types
83Mixed-Type Arithmetic and Automatic Promotion
84Compound Assignment Operators and Implicit Casting
85Casting Pitfalls: Overflow, Underflow, and Best Practices

Java

26The int Type: Java's Default Integer
27Declaring and Initializing int Variables
28The long Type: Extended Range Integers
29The L Suffix for long Literals
30The short Type: Small Range Integers
31The byte Type: Single-Byte Integers
32Why int is the Default: Performance and Compatibility
33Integer Overflow: What Happens at the Limits
34Mixing Integer Types in Expressions
35Binary, Octal, and Hexadecimal Integer Literals
36Choosing the Right Integer Type for Your Data
37Common Pitfalls: Integer Division and Truncation
38Introducing Floating-Point Types: float and double
39Declaring and Initializing float and double Variables
40Floating-Point Literals and the f/F Suffix
41Scientific Notation in Floating-Point Literals
42Precision and Range of float vs double
43Floating-Point Arithmetic and Rounding Errors
44Special Values: Infinity, -Infinity, and NaN
45Comparing Floating-Point Numbers Safely
46When to Use double Over float
47Floating-Point Best Practices and Pitfalls
48The char Type: Representing Single Characters
49Character Literals and Escape Sequences
50Unicode Escapes: \uXXXX Notation
51char as a Numeric Type: Arithmetic with Characters
52The boolean Type: true and false
53Declaring and Initializing boolean Variables
54Boolean Expressions and Comparison Results
55Common Mistakes: boolean vs Numeric Types
56Integer Literals: Decimal, Hexadecimal, Octal, and Binary
57Long Literals and the L Suffix
58Floating-Point Literals and the F and D Suffixes
59Scientific Notation for Floating-Point Literals
60Character Literals and Escape Sequences
61String Literals and Escape Characters
62Boolean Literals: true and false
63Underscores in Numeric Literals for Readability
64Rules and Restrictions for Underscores in Literals
65Variable Declaration Syntax
66Uninitialized Variables and Compilation Errors
67Default Values for Fields vs Local Variables
68Declaration and Initialization in One Statement
69Multiple Variable Declaration
70The final Keyword for Variables
71final and Initialization Requirements
72Blank Finals in Constructors
73final Parameters
74Naming Conventions for final Variables
75final vs Immutability
76Widening Conversions: Automatic Type Promotion
77Implicit Widening in Assignments and Expressions
78Narrowing Conversions: Potential Data Loss
79Explicit Cast Syntax: (type) expression
80Truncation in Integer Narrowing Casts
81Precision Loss in Floating-Point to Integer Casts
82Casting Between char and Integer Types
83Mixed-Type Arithmetic and Automatic Promotion
84Compound Assignment Operators and Implicit Casting
85Casting Pitfalls: Overflow, Underflow, and Best Practices

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Lesson 64 of 2,870·2. Variables and Primitive TypesPro lesson

Rules and Restrictions for Underscores in Literals

Learn where underscores are allowed and forbidden in numeric literals to avoid compilation errors.

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