java Map with Integer value comparison [duplicate]
Solution 1:
This is because it's caching by JVM. In other words for all values [-128; 128). Integer.valueOf(i) will return the same Integer instance.
public static Integer valueOf(int i) {
if (i >= IntegerCache.low && i <= IntegerCache.high)
return IntegerCache.cache[i + (-IntegerCache.low)];
return new Integer(i);
}