@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((group == null) ? 0 : group.hashCode());
		result = prime * result + ((parentModule == null) ? 0 : parentModule.hashCode());
		return result;
	}
Returns whether some other object is "equal to" this one.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/programtree/ProgramNode.java