TestImmutableSet.java

import com.google.common.collect.ImmutableSet;

import java.util.HashSet;

public class TestImmutableSet {

  public static void main(String[] args) {
    ImmutableSet<String> IMMUTABLE =
          ImmutableSet.of(
                  "BoolField.class",
                  "BCDIntField.class",
                  "BCDLongField.class",
                  "BCDStrField.class",
                  "ByteField.class",
                  "DateField.class",
                  "DoubleField.class",
                  "FloatField.class",
                  "ShortField.class",
                  "IntField.class",
                  "LongField.class",
                  "SortableLongField.class",
                  "SortableIntField.class",
                  "SortableFloatField.class",
                  "SortableDoubleField.class",
                  "StrField.class",
                  "TextField.class",
                  "TrieField.class",
                  "TrieIntField.class",
                  "TrieLongField.class",
                  "TrieFloatField.class",
                  "TrieDoubleField.class",
                  "TrieDateField.class",
                  "BinaryField.class");
    HashSet<String> JAVA_MUTABLE = new HashSet<String>(IMMUTABLE);
    boolean b = false;
    for (int i=0;i<100;i++){
      b = JAVA_MUTABLE.contains("StrField.class");
      b = IMMUTABLE.contains("StrField.class");

    }
    long t1 = System.currentTimeMillis();
    for (int i=0;i<10000000;i++){
      b = JAVA_MUTABLE.contains("StrField.class");

    }

    long t2 = System.currentTimeMillis();
    System.out.println("Time java HashSet : "+b+" : "+(t2- t1) );
    for (int i=0;i<10000000;i++){
      b = IMMUTABLE.contains("StrField.class");


    }


    System.out.println("Time Google ImmutableSet : "+b+" : "+(System.currentTimeMillis()- t2) );

  }
}