Some of the hashcodes of interest’s are in java wrappers

Boolean – hashCode() – 1231 for ‘true’ and ‘1237’ for ‘false’
Integer – hashCode() – will return the primitive int value
Byte – hashCode() – primitive int value of the byte is returned as hashcode
Character– hashCode() – primitive int value of the byte is returned as hashcode
Long – hashCode() – value of the following expression

(int)(this.longValue()^(this.longValue()>>>32))

to know more about this please check hashcode-contract-with-equals