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Pankaj Gupta
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Pankaj GuptaScholar
Asked: 2 months agoIn:
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What is the difference between whitespace and unicode space character.

What is the difference between whitespace and unicode space character.

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javaunicode spacewhitespace
  1. Pankaj Gupta
    Pankaj Gupta Scholar

    Key Difference Term Whitespace Unicode Space Character Definition Any character that creates "blank" space in text (invisible characters that separate words or lines). Specific space-like characters defined in the Unicode standard. Scope A broad category that includes a variety of invisible characteRead more

    Key Difference

    Term Whitespace Unicode Space Character

    Definition Any character that creates “blank” space in text (invisible characters that separate words or lines). Specific space-like characters defined in the Unicode standard.
    Scope A broad category that includes a variety of invisible characters like spaces, tabs, and newlines. A subset of Unicode characters that are defined as various types of space.
    Examples ‘ ‘ (space), \n (newline), \t (tab), \r (carriage return) U+0020 (Space), U+00A0 (No-Break Space), U+2003 (Em Space), U+2009 (Thin Space), etc.
    In Java / Programming Identified by Character.isWhitespace() Each Unicode space has a specific code point, width, and behavior in rendering.

    1. Whitespace Characters

    These are general characters that create space but are often interpreted by programming languages or parsers.

    In Java, Character.isWhitespace(c) returns true for:

    Standard space ‘ ‘ (U+0020)

    Tab \t (U+0009)

    Newline \n (U+000A)

    Carriage return \r (U+000D)

    Vertical tab \u000B

    Form feed \u000C

    All Unicode characters categorized as whitespace.

    2. Unicode Space Characters

    Unicode defines many space characters explicitly, each with a specific purpose or width. Here are a few notable ones:

    Unicode Name Width/Use

    U+0020 Space Standard space character
    U+00A0 No-Break Space Same as space but prevents line breaks
    U+2000 En Quad Space equal to 1 en
    U+2001 Em Quad Space equal to 1 em
    U+2002 En Space Narrower than em space
    U+2003 Em Space Wider space for typesetting
    U+2009 Thin Space Very narrow space
    U+202F Narrow No-Break Space Narrower than no-break space
    U+3000 Ideographic Space Used in East Asian scripts, full-width

    These characters may not be detected by simple string manipulations unless Unicode-aware methods are used.

    Important Distinctions

    All Unicode space characters are whitespace, but not all whitespace characters are Unicode space characters.

    Some whitespace characters (like \n, \t) are control characters, not printable spaces.

    Unicode spaces may have width, non-breaking behavior, or typographic purpose.

    Summary

    Concept Includes

    Whitespace Spaces, tabs, newlines, form feeds, etc.
    Unicode Space Characters Precisely defined space characters like U+00A0, U+2002, U+2003, etc.

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Pankaj Gupta
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Pankaj GuptaScholar
Asked: 6 days agoIn:
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What is the difference between next() and nextLine()?

What is the difference between next() and nextLine()?

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javanext()nextline()
  1. Pankaj Gupta
    Pankaj Gupta Scholar

    1. next() Function: Reads the next token (word) from input. Delimiter: Stops reading when it encounters whitespace (space, tab, or newline). Ignores: Leading whitespace before the token. Use case: Good for reading single words. Example: Scanner sc = new Scanner(System.in); System.out.print("Enter yoRead more

    1. next()

    • Function: Reads the next token (word) from input.

    • Delimiter: Stops reading when it encounters whitespace (space, tab, or newline).

    • Ignores: Leading whitespace before the token.

    • Use case: Good for reading single words.

    Example:

    Scanner sc = new Scanner(System.in);
    System.out.print("Enter your name: ");
    String name = sc.next();
    System.out.println("You entered: " + name);

    Input:

    Rahul Sharma

    Output:

    You entered: Rahul

    👉 It only captures "Rahul" because next() stops at the first space.

    2. nextLine()

    • Function: Reads the entire line of input (until Enter/\n).

    • Delimiter: Stops only when the newline character is encountered.

    • Use case: Good for reading sentences or full lines with spaces.

    Example:

    Scanner sc = new Scanner(System.in);
    System.out.print("Enter your full name: ");
    String name = sc.nextLine();
    System.out.println("You entered: " + name);

    Input:

    Rahul Sharma

    Output:

    You entered: Rahul Sharma

    👉 Here it captures the whole line, including spaces.

    ⚡ Key Differences Table

    Featurenext()nextLine()
    Reads up toWhitespace (space, tab, newline)End of line (\n)
    Can read spaces?❌ No (stops at space)✅ Yes (includes spaces)
    Best forSingle words/tokensFull sentences / whole line
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Harpreet
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HarpreetBeginner
Asked: 6 days agoIn:
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In Java, consider the following code snippet:Scanner sc = new Scanner(System.in); System.out.print("Enter your age: "); int age = sc.nextInt(); System.out.print("Enter your full name: "); String name = sc.nextLine(); System.out.println("Age: " + age); System.out.println("Name: " + name);When ...Read more

In Java, consider the following code snippet:

Scanner sc = new Scanner(System.in);

System.out.print("Enter your age: ");
int age = sc.nextInt();

System.out.print("Enter your full name: ");
String name = sc.nextLine();

System.out.println("Age: " + age);
System.out.println("Name: " + name);

When the input is:

20
Rahul Sharma

The output is:

Age: 20
Name:

Explain why the nextLine() method appears to “skip” input in this case.

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javanextline()scanner
  1. Pankaj Gupta
    Pankaj Gupta Scholar

    The nextLine() method appears to skip input because after executing nextInt(), the newline character (\n) from pressing Enter is still left in the input buffer. When nextLine() is called immediately after, it reads this leftover newline character instead of waiting for new user input. As a result, iRead more

    The nextLine() method appears to skip input because after executing nextInt(), the newline character (\n) from pressing Enter is still left in the input buffer.

    When nextLine() is called immediately after, it reads this leftover newline character instead of waiting for new user input. As a result, it returns an empty string and seems to “skip” the input.

    To fix the issue, insert an extra sc.nextLine(); after nextInt() to consume the leftover newline character.

    Scanner sc = new Scanner(System.in);

    System.out.print(“Enter your age: “);
    int age = sc.nextInt();
    sc.nextLine(); // consume the leftover newline

    System.out.print(“Enter your full name: “);
    String name = sc.nextLine();

    System.out.println(“Age: ” + age);
    System.out.println(“Name: ” + name);

    Now, if the input is:

    20
    Rahul Sharma

    The output will be:

    Age: 20
    Name: Rahul Sharma

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