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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.Objects;
  4. import java.util.logging.Level;
  5. import java.util.logging.Logger;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone {
  9.     public static void main(String[] args) {
  10.         ValueSwitcher<Integer> valueSwitcher = ValueSwitcher.getInstance();
  11.         valueSwitcher.setValue1(1);
  12.         valueSwitcher.setValue2(2);
  13.         valueSwitcher.switchValues();
  14.         System.out.println(String.format("value1: %s, value2: %s", valueSwitcher.getValue1(), valueSwitcher.getValue2()));
  15.     }
  16. }
  17.  
  18.  
  19. class ValueSwitcher<T1> {
  20.     private final static Logger LOGGER = Logger.getLogger("Value switcher");
  21.     private T1 value1;
  22.     private T1 value2;
  23.  
  24.  
  25.     public static <T> ValueSwitcher<T> getInstance() {
  26.         return new ValueSwitcher<>();
  27.     }
  28.  
  29.     protected ValueSwitcher() {
  30.         LOGGER.entering(ValueSwitcher.class.getCanonicalName(), "ctor");
  31.         LOGGER.entering(ValueSwitcher.class.getCanonicalName(), "ctor");
  32.     }
  33.  
  34.     public T1 getValue1() {
  35.         LOGGER.entering(ValueSwitcher.class.getCanonicalName(), "getValue1");
  36.         return value1;
  37.     }
  38.  
  39.     public void setValue1(T1 value1) {
  40.         LOGGER.entering(ValueSwitcher.class.getCanonicalName(), "setValue1", value1);
  41.         this.value1 = value1;
  42.         LOGGER.exiting(ValueSwitcher.class.getCanonicalName(), "setValue1", value1);
  43.     }
  44.  
  45.     public T1 getValue2() {
  46.         LOGGER.entering(ValueSwitcher.class.getCanonicalName(), "getValue2");
  47.         return value2;
  48.     }
  49.  
  50.     public void setValue2(T1 value2) {
  51.         LOGGER.entering(ValueSwitcher.class.getCanonicalName(), "setValue2", value2);
  52.         this.value2 = value2;
  53.         LOGGER.exiting(ValueSwitcher.class.getCanonicalName(), "setValue2", value2);
  54.     }
  55.  
  56.     @Override
  57.     public boolean equals(Object o) {
  58.         if (this == o) return true;
  59.         if (o == null || getClass() != o.getClass()) return false;
  60.         ValueSwitcher<?> that = (ValueSwitcher<?>) o;
  61.         return Objects.equals(getValue1(), that.getValue1()) &&
  62.                 Objects.equals(getValue2(), that.getValue2());
  63.     }
  64.  
  65.     @Override
  66.     public int hashCode() {
  67.         return Objects.hash(getValue1(), getValue2());
  68.     }
  69.  
  70.     public void switchValues() {
  71.         LOGGER.entering(ValueSwitcher.class.getCanonicalName(), "switchValues");
  72.         T1 tmpValue = getValue1();
  73.         setValue1(getValue2());
  74.         setValue2(tmpValue);
  75.         if (shouldLogInfo()) {
  76.             LOGGER.log(Level.INFO, String.format("Values %s and %s has been switched", value1, value2));
  77.         }
  78.         LOGGER.exiting(ValueSwitcher.class.getCanonicalName(), "switchValues");
  79.     }
  80.  
  81.     private static boolean shouldLogInfo() {
  82.         Level level = Logger.getGlobal().getLevel();
  83.         return level != null && level.intValue() > Level.INFO.intValue();
  84.     }
  85.  
  86. }
Success #stdin #stdout 0.13s 37900KB
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Standard input is empty
stdout
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value1: 2, value2: 1
https://ideone.com/nlxorZ
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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