Strip whitespace from a string/Top and tail: Difference between revisions
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=={{header|Java}}== |
=={{header|Java}}== |
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Java has the ''trim'' and ''strip'' operations. Both will achieve a similar result.<br /> |
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The ''trim'' method works on Unicode values under 0x20. Whereas, ''strip'' will remove all Unicode white-space characters. |
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<syntaxhighlight lang="java"> |
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" abc".stripLeading() |
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</syntaxhighlight> |
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<syntaxhighlight lang="java"> |
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"abc ".stripTrailing() |
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</syntaxhighlight> |
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<syntaxhighlight lang="java"> |
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" abc ".strip() |
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</syntaxhighlight> |
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<syntaxhighlight lang="java"> |
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" abc ".trim() |
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</syntaxhighlight> |
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For more control over what characters should be removed, you could implement your own methods. |
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<syntaxhighlight lang="java"> |
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String removeLeading(String string, char... characters) { |
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int index = 0; |
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for (char characterA : string.toCharArray()) { |
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for (char characterB : characters) { |
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if (characterA != characterB) |
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return string.substring(index); |
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} |
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index++; |
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} |
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return string; |
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} |
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</syntaxhighlight> |
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<syntaxhighlight lang="java"> |
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String removeTrailing(String string, char... characters) { |
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for (int index = string.length() - 1; index >= 0; index--) { |
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for (char character : characters) { |
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if (string.charAt(index) != character) |
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return string.substring(0, index + 1); |
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} |
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} |
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return string; |
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} |
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</syntaxhighlight> |
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<br /> |
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An alternate demonstration<br /> |
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Java offers <code>String.trim</code>. However, this function only strips out ASCII control characters. As such it should generally be avoided for processing text. |
Java offers <code>String.trim</code>. However, this function only strips out ASCII control characters. As such it should generally be avoided for processing text. |
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