private String getReturnType(ConstantPoolUtf8Info methodDescriptor) {
		String methodDescriptorString = methodDescriptor.getString();
		int closeParenthesisPos = methodDescriptorString.indexOf(')') + 1;
		String encodedReturnType = methodDescriptorString.substring(closeParenthesisPos);
		return DescriptorDecoder.getTypeNameFromDescriptor(encodedReturnType, false, true);
	}
Clips the encoded return type from the method descriptor then
decodes it into a readable data type.
Ghidra/Processors/JVM/src/main/java/ghidra/javaclass/format/MethodInfoJava.java