What will be the output of substring(0,0) in java?
What will be the output of substring(0,0) in java?
Read lessKey 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.
In Java, the substring(int beginIndex, int endIndex) method returns a new string starting from beginIndex (inclusive) and ending at endIndex (exclusive). Example: String str = "example"; System.out.println(str.substring(0, 0)); Output: "" This means an empty string is returned. Explanation: beginIndRead more
In Java, the substring(int beginIndex, int endIndex) method returns a new string starting from beginIndex (inclusive) and ending at endIndex (exclusive).
Example:
String str = “example”;
System.out.println(str.substring(0, 0));
Output: “”
This means an empty string is returned.
Explanation:
beginIndex = 0 (inclusive)
endIndex = 0 (exclusive)
No characters are selected, so the result is an empty string “”.
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