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  1. import java.lang.reflect.InvocationTargetException;
  2. import java.util.Objects;
  3.  
  4. class Ideone {
  5.     public static void main(String[] args)
  6.             throws NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {
  7.         testClassNewInstance();
  8.         testClassNewInstanceWithVarOnly();
  9.         testClassNewInstanceWithNonFinalVarOnly();
  10.     }
  11.  
  12.     private static void testClassNewInstance()
  13.             throws NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {
  14.         final var input = "A string";
  15.         final var theClass = input.getClass();
  16.         final var constructor = theClass.getConstructor();
  17.         final String newString = constructor.newInstance();
  18.  
  19.         System.out.printf(
  20.                 ("in testClassNewInstance,                    Objects.equals(\"\", newString)         = %b\n" +
  21.                  "in testClassNewInstance,                    \"\".equals(newString)                  = %b\n" +
  22.                  "in testClassNewInstance,                    Objects.equals(\"A string\", newString) = %b\n" +
  23.                  "in testClassNewInstance,                    \"A string\".equals(newString)          = %b\n"),
  24.                 Objects.equals("", newString),
  25.                 "".equals(newString),
  26.                 Objects.equals("A string", newString),
  27.                 "A string".equals(newString));
  28.     }
  29.  
  30.     private static void testClassNewInstanceWithVarOnly() throws NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {
  31.         final var input = "A string";
  32.         final var theClass = input.getClass();
  33.         final var constructor = theClass.getConstructor();
  34.         final var newString = constructor.newInstance();
  35.  
  36.         System.out.printf(
  37.                 ("in testClassNewInstanceWithVarOnly,         Objects.equals(\"\", newString)         = %b\n" +
  38.                  "in testClassNewInstanceWithVarOnly,         \"\".equals(newString)                  = %b\n" +
  39.                  "in testClassNewInstanceWithVarOnly,         Objects.equals(\"A string\", newString) = %b\n" +
  40.                  "in testClassNewInstanceWithVarOnly,         \"A string\".equals(newString)          = %b\n"),
  41.                 Objects.equals("", newString),
  42.                 "".equals(newString),
  43.                 Objects.equals("A string", newString),
  44.                 "A string".equals(newString));
  45.     }
  46.  
  47.     private static void testClassNewInstanceWithNonFinalVarOnly() throws NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {
  48.         var input = "A string";
  49.         final var theClass = input.getClass();
  50.         final var constructor = theClass.getConstructor();
  51.         final var newString = constructor.newInstance();
  52.  
  53.         System.out.printf(
  54.                 ("in testClassNewInstanceWithNonFinalVarOnly, Objects.equals(\"\", newString)         = %b\n" +
  55.                  "in testClassNewInstanceWithNonFinalVarOnly, \"\".equals(newString)                  = %b\n" +
  56.                  "in testClassNewInstanceWithNonFinalVarOnly, Objects.equals(\"A string\", newString) = %b\n" +
  57.                  "in testClassNewInstanceWithNonFinalVarOnly, \"A string\".equals(newString)          = %b\n%n"),
  58.                 Objects.equals("", newString),
  59.                 "".equals(newString),
  60.                 Objects.equals("A string", newString),
  61.                 "A string".equals(newString));
  62.     }
  63. }
Success #stdin #stdout 0.1s 50676KB
comments (?)
stdin
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Standard input is empty
stdout
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in testClassNewInstance,                    Objects.equals("", newString)         = true
in testClassNewInstance,                    "".equals(newString)                  = true
in testClassNewInstance,                    Objects.equals("A string", newString) = false
in testClassNewInstance,                    "A string".equals(newString)          = false
in testClassNewInstanceWithVarOnly,         Objects.equals("", newString)         = false
in testClassNewInstanceWithVarOnly,         "".equals(newString)                  = false
in testClassNewInstanceWithVarOnly,         Objects.equals("A string", newString) = true
in testClassNewInstanceWithVarOnly,         "A string".equals(newString)          = true
in testClassNewInstanceWithNonFinalVarOnly, Objects.equals("", newString)         = true
in testClassNewInstanceWithNonFinalVarOnly, "".equals(newString)                  = true
in testClassNewInstanceWithNonFinalVarOnly, Objects.equals("A string", newString) = false
in testClassNewInstanceWithNonFinalVarOnly, "A string".equals(newString)          = false
https://ideone.com/yr5wgA
language:
Java (HotSpot 12)
created:
1 year ago
visibility:
public

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