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  1. import java.util.Map;
  2. import java.util.HashMap;
  3.  
  4. class Main {
  5.     public static void main (String[] args) {
  6.         Map<String,Object> name2object = new HashMap<String,Object>();
  7.         name2object.put("Fred", new Object());
  8.         name2object.put("Wilma", new Object());
  9.         name2object.put("Betty", new Object());
  10.         System.out.println(name2object);
  11.  
  12.         String[] names = {"Bam-Bam","Barney","Betty","Fred","Pebbles","Wilma"};
  13.         for (String name: names) {
  14.             if (name2object.containsKey(name)) {
  15.                 System.out.println(name + "'s here.");
  16.             } else {
  17.                 System.out.println("Where's " + name + "?");
  18.             }
  19.         }
  20.  
  21.         Map<Object,String> object2name = new HashMap<Object,String>();
  22.         for (String name: name2object.keySet()) {
  23.             Object o = name2object.get(name);
  24.             object2name.put(o, name);
  25.         }
  26.         System.out.println(object2name);
  27.  
  28.         for (Object o: name2object.values()) {
  29.             String name = object2name.get(o);
  30.             if (name.equals("Wilma")) {
  31.                 System.out.println("Wilma is " + o.toString() + ".");
  32.             }
  33.         }
  34.     }
  35. }
  36.  
Success #stdin #stdout 0.07s 380224KB
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stdin
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Standard input is empty
stdout
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{Betty=java.lang.Object@ea7776, Fred=java.lang.Object@14920f8, Wilma=java.lang.Object@1387c6}
Where's Bam-Bam?
Where's Barney?
Betty's here.
Fred's here.
Where's Pebbles?
Wilma's here.
{java.lang.Object@14920f8=Fred, java.lang.Object@ea7776=Betty, java.lang.Object@1387c6=Wilma}
Wilma is java.lang.Object@1387c6.
https://ideone.com/pcT0uB
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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