In Oracle/Sun JDK, setting Java property "java.lang.Integer.IntegerCache.high" affects the size of the Integer cache, whether or not it came from -XX:AutoBoxCacheMax

command_prompt

D:\experiment>javac TestIntegerCache.java

D:\experiment>java -Djava.lang.Integer.IntegerCache.high=2000 TestIntegerCache
1: true
2: false

D:\experiment>java -version
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) Client VM (build 20.1-b02, mixed mode, sharing)

TestIntegerCache.java

public class TestIntegerCache {
  public static void main(String[] args) {
    puts("1: " + ((Object) 2000 == (Object) 2000));
    puts("2: " + ((Object) 2001 == (Object) 2001));
  }
  
  public static void puts(String s) {
    System.out.println(s);
  }
}