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  1. import java.util.Optional;
  2.  
  3. class Ideone {
  4.   public static void main(String[] args) {
  5.     System.out.printf("null contains \"foo\": %b%n", firstContainsSecond(null, "foo"));
  6.     System.out.printf("null contains \"\": %b%n", firstContainsSecond(null, ""));
  7.     System.out.printf("\"\" contains \"\": %b%n", firstContainsSecond("", ""));
  8.     System.out.printf(
  9.         "\"This is a foo\" contains \"foo\": %b%n",
  10.         firstContainsSecond("This is a foo", "foo"));
  11.     System.out.printf(
  12.         "\"This is a foo\" contains \"bar\": %b%n",
  13.         firstContainsSecond("This is a foo", "bar"));
  14.   }
  15.  
  16.   private static boolean firstContainsSecond(String first, String second) {
  17.     return Optional.ofNullable(first)
  18.         .map(s -> s.contains(second))
  19.         .orElse(false);
  20.   }
  21. }
Success #stdin #stdout 0.11s 38952KB
comments (?)
stdin
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Standard input is empty
stdout
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null contains "foo": false
null contains "": false
"" contains "": true
"This is a foo" contains "foo": true
"This is a foo" contains "bar": false
https://ideone.com/cUL8nB
language:
Java (HotSpot 12)
created:
2 years ago
visibility:
public

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