Swing JLabel将unicode“ \\ u21B5”显示为文本不起作用

Question

I am working with virtual keyboard in my application. I tried to display the arrow keys in the keyboard by unicodes, Some unicodes are displaying correctly others displaying as junk.

Ex:

\u2191 - Displaying
\u21B5 - Not displaying

Answer 1

Make sure your OS includes a font that supports unicode.

Try one of the fonts from this list: http://unicode.org/resources/fonts.html

• Alan Wood's Unicode fonts resource
• Code2000, Code2001, and Code2002 (James Kass)
  A shareware Unicode font
• Edward Trager's index of free/libre fonts
• Fonts By Range (Alan Wood)
  Information on the Unicode fonts available for each Unicode range
• Gallery of Unicode Fonts
  Hundreds of free Unicode fonts, with sample images from each
• Google Noto fonts
  Intended as a source for fonts covering all scripts of The Unicode Standard, released under Apache 2.0 license. Subdirectories for hinted and unhinted versions, in bundles or individually.
• Google Noto "early access" fonts
  This repository contains Noto fonts that are currently under development, so they may not be stable, but are available for use and comment. (A discussion forum is available.)
• GNU Unifont
  This font includes glyphs for every printable code point in the Unicode Basic Multilingual Plane (BMP), and is regularly updated.
• Junicode (Peter S. Baker)
  A Unicode-based font for medievalists.
• Last Resort Font
  Link to downloading the Last Resort Font as well as its End User License Agreement
• Microsoft Arial Unicode MS and Lucida Sans Unicode
• Monotype fonts
• SIL Fonts
• George Douros' Fonts for Symbols and Ancient Scripts .
  Symbola covers many of the Symbol blocks, including Unicode 8.0 characters and pictographs (emoji). Older versions of Symbola are also available at other download sites .
• UniMath
  An OpenType font which contains all of the TeX, LaTeX, and AMS TeX symbols, as well as hundreds of other symbols from the Unicode ranges that cover mathematical operators, arrows, and technical symbols.